2011 Tōhoku earthquake and tsunami

2011 Sendai earthquake and tsunami

An aerial view of the tsunami damage in North Sendai
Tokyo Sendai class=notpageimage| Map showing the epicenter of the earthquake
UTC time	??
Duration	5 minutes
Magnitude	9.0 Mw
Depth	32 km (20 mi)
Epicenter	38.322°N 142.369°E / 38.322; 142.369
Type	Megathrust earthquake
Areas affected	Japan (primary) Pacific Rim (tsunami)
Total damage	Flooding, landslides, fires, building and infrastructure damage, nuclear incidents
Peak acceleration	0.5 g
Tsunami	Yes
Landslides	Yes
Aftershocks	At least 517 (35 above 6.0 MW)

The 2011 Sendai earthquake and tsunami (東北地方太平洋沖地震, Tōhoku Chihō Taiheiyō-oki Jishin, literally "Tōhoku region Pacific Ocean offshore earthquake") was a 9.0 M_W megathrust earthquake off the coast of Japan that occurred at 14:46 JST (05:46 UTC) on Friday 11 March 2011. The epicenter was 130 kilometers (81 mi) off the east coast of the Oshika Peninsula, Tōhoku, with the hypocenter at a depth of 32 km (20 mi).

The earthquake triggered tsunami warnings and evacuations along Japan's Pacific coast and in at least 20 countries, including the entire Pacific coast of North America and South America. The earthquake created extremely destructive tsunami waves of up to 10 meters (33 ft) that struck Japan minutes after the quake, in some cases travelling up to 10 km (6 mi) inland, with smaller waves reaching many other countries after several hours.

The Japanese National Police Agency has officially confirmed 19,759 deaths,, 6,242 injured,, and 2,553 people missing across 16 prefectures. The earthquake and tsunami caused extensive and severe damage in Japan, including heavy damage to roads and railways as well as fires in many areas, and a dam collapse. Around 4.4 million households in northeastern Japan were left without electricity and 1.5 million without water. Many electrical generators were taken down, and at least three nuclear reactors suffered explosions due to hydrogen buildup within the outer containment buildings. According to reports by the International Atomic Energy Agency (IAEA), containment of each of the radioactive cores is intact and no meltdowns have occurred. Residents within a 20 km (12 mi) radius of the Fukushima I Nuclear Power Plant and a 10 km (6.2 mi) radius of the Fukushima II Nuclear Power Plant were evacuated.

The estimates of the Sendai earthquake's magnitude made it the strongest known earthquake to hit Japan, and one of the the five strongest earthquakes in the world overall since modern record-keeping began in 1900. Japanese Prime Minister Naoto Kan said that "in the 65 years after the end of World War II, this is the toughest and the most difficult crisis for Japan." The earthquake moved Honshu 2.4 m (7.9 ft) east and shifted the Earth on its axis by almost 10 cm (3.9 in), an expected change for an earthquake of that magnitude. Early estimates placed insured losses from the earthquake alone at US$14.5 to $34.6 billion. The Bank of Japan offered ¥15 trillion (US$183 billion) to the banking system on 14 March 2011 to normalize market conditions.

Earthquake

Map of the Sendai earthquake and aftershocks

The main earthquake was preceded by a number of large foreshocks, beginning with a 7.2 M_W event on 9 March approximately 40 km (25 mi) from 11 March quake, and followed by another three on the same day in excess of 6 M_W in magnitude. One minute prior to the effects of the earthquake being felt in Tokyo, the Earthquake Early Warning system connected to more than 1,000 seismometers in Japan sent out warnings on television of an impending earthquake to millions. This was possible because the damaging seismic S-waves, traveling at 4 kilometers (2.5 mi) per second, took about 90 seconds to travel the 373 km (232 mi) to Tokyo. The early warning is believed by the Japan Meteorological Agency to have saved many lives.

The earthquake occurred at 14:46 local time in the western Pacific Ocean, 130 km (81 mi) east of Sendai, Honshu, Japan. Its epicenter was 373 km (232 mi) from Tokyo, according to the United States Geological Survey (USGS). Multiple aftershocks were reported after the initial magnitude 9.0 quake. A magnitude 7.0 aftershock was reported at 15:06 local time, 7.4 at 15:15 local time and 7.2 at 15:26 local time. Over five hundred aftershocks of magnitude 4.5 or greater have occurred since the initial quake.

Initially reported as 7.9 by the USGS, the magnitude was quickly upgraded to 8.8 and then to 8.9, and then again to 9.0. This earthquake occurred where the Pacific Plate is subducting under the plate beneath northern Honshu; which plate this is is a matter of debate amongst scientists. The Pacific plate, which moves at a rate of 8 to 9 cm (3.1 to 3.5 in) a year, dips under Honshu's underlying plate releasing large amounts of energy. This motion pulls the upper plate down until it breaks. The break 130 kilometers (81 mi) off of the coast of Sendai was estimated to be several tens of kilometers long and only 32 kilometers (20 mi) deep, and caused the sea floor to spring up several meters, causing the earthquake. A quake of this size usually has a rupture length of at least 480 km (300 mi) and requires a long, relatively straight fault line. Because the plate boundary and subduction zone in this region is not very straight, it is unusual for the magnitude of an earthquake to exceed 8.5; the magnitude of this earthquake was a surprise to some seismologists. The hypocentral region of this earthquake extends from offshore Iwate to offshore Ibaraki Prefectures. The Japanese Meteorological Agency said that the earthquake may have ruptured the fault zone from Iwate to Ibaraki with a length of 500 km (310 mi) and a width of 200 km (120 mi). Analysis showed that this earthquake consisted of a set of three events. The earthquake may have had a mechanism similar to that of another large earthquake in 869 with estimated magnitude M_s 8.6, which also created a large tsunami. Other major earthquakes with tsunamis struck the Sanriku Coast region in 1896 and 1933.

The quake registered the maximum of 7 on the Japan Meteorological Agency seismic intensity scale in Kurihara, Miyagi Prefecture. Three other prefectures—Fukushima, Ibaraki and Tochigi—recorded an upper 6 on the JMA scale. Seismic stations in Iwate, Gunma, Saitama and Chiba Prefecture measured a lower 6, recording an upper 5 in Tokyo.

The United States' Nuclear Energy Institute released figures indicating the earthquake generated peak ground accelerations of 0.35g (3.43 m/s²) near the epicenter; with a study by the University of Tokyo indicating some areas experienced accelerations in excess of 0.5g (4.9 m/s²).

Energy

This earthquake released a surface energy (M_e) of 1.9±0.5×10¹⁷ joules, dissipated as shaking and tsunamic energy, which is nearly double that of the 9.1-magnitude 2004 Sumatran earthquake that killed 230,000 people, and flung the 2,600 ton Apung 1 ship 2 to 3 km (1.2 to 1.9 mi) inland. "If we could only harness the [surface] energy from this earthquake, it would power [a] city the size of Los Angeles for an entire year," USGS director Marcia McNutt said in an interview. The total energy released, also known as the seismic moment (M₀), was more than 200,000 times the surface energy and was calculated by the USGS WPhase Moment Solution at 3.9×10²² joules, slightly less than the 2004 Sumatra quake. This is equivalent to 9.32 teratons of TNT (approximately 600 million times that of the Hiroshima bomb, or 186,400 times as powerful as man's largest-ever explosive device, Tsar Bomba).

Geophysical impact

Soil liquefaction in Koto, Tokyo

The quake moved portions of northeast Japan by as much as 2.4 m (7.9 ft) closer to North America, making portions of Japan's landmass "wider than before," according to geophysicist Ross Stein. Portions of Japan closest to the epicenter experienced the largest shifts. Stein also noted that a 400 km (250 mile) stretch of coastline dropped vertically by 0.6 m (2.0 ft), allowing the tsunami to travel farther and faster onto land. The Pacific plate itself may have moved eastwards by up to 20 m (66 ft), though the actual displacement will have diminished with greater distance from the site of the fault. Other estimates put the amount of slippage at as much as 40 m (130 ft), covering an area some 300 km (190 mi) to 400 km (250 mi) long by 100 km (62 mi) wide. If confirmed, this would be one of the largest fault movements ever recorded and accounts for its extreme destructiveness.

According to Italy's National Institute of Geophysics and Volcanology, the earthquake shifted the Earth's axis by 25 centimeters (9.8 in). This deviation led to a number of small planetary changes, including the length of a day and the tilt of the Earth. The speed of the Earth's rotation increased, shortening the day by 1.8 microseconds due to the redistribution of Earth's mass. The axial shift was caused by the redistribution of mass on the Earth's surface, which changed the planet's moment of inertia. Due to the effects of conservation of angular momentum, such changes of inertia result in small changes to the Earth's rate of rotation. These are expected changes for an earthquake of this magnitude.

Shinmoedake, a volcano in Kyushu, erupted two days after the earthquake. The volcano had erupted in January 2011; it is not known if the later eruption was linked to the earthquake. In Antarctica, the seismic waves from the earthquake were reported to have caused the Whillans Ice Stream to slip by about 0.5 meters (1.6 ft).

Tsunami

Wave height map for the tsunami from NOAA

Water column height on 11 March 2011 at DART Station, 690 NM Southeast of Tokyo

The earthquake caused a massive tsunami which wrought massive destruction along the Pacific coastline of Japan's northern islands. The tsunami propagated across the Pacific, and warnings were issued and evacuations carried out in many countries with Pacific coasts, including the entire Pacific coast of North and South America from Alaska to Chile; however, while the tsunami was felt in many of these places, it caused only relatively minor effects. Chile's section of Pacific coast is furthest from Japan (about 17,000 km away—the furthest possible distance on the earth is the semi-circumference, about 20,000 km) but still was struck by tsunami waves up to 2 meters high.

Japan

The tsunami warning issued by the Japan Meteorological Agency was the most serious on its warning scale; it rated as a "Major tsunami", being at least 3 m (9.8 ft) high. The actual height predicted varied, the greatest being for Miyagi at 10 m (33 ft) high. The earthquake took place at 14:46 JST around 70 km (43 mi) from the nearest point on Japan's coastline, and initial estimates indicated the tsunami would have taken 10 to 30 minutes to reach the areas first affected, and then areas further north and south based on the geography of the coastline. Just over an hour after the earthquake, a tsunami was observed at 15:55 JST flooding Sendai Airport, which is located near the coast of Miyagi Prefecture, with waves sweeping away cars and planes and flooding various buildings as they traveled inland. The impact of the tsunami in and around Sendai Airport was filmed by an NHK News helicopter, showing a number of vehicles on local roads trying to escape the approaching wave and being engulfed by it. A 4-meter (13 ft)-high tsunami hit Iwate Prefecture.

Like the 2004 Indian Ocean earthquake and tsunami and Cyclone Nargis, the damage by surging water, though much more localized, was far more deadly and destructive than the actual quake. There were reports of "whole towns gone" from tsunami-hit areas in Japan, including 9,500 missing in Minamisanriku; while Jin Sato—the mayor of the town—survived in the tsunami, one thousand bodies had been recovered in the town by 14 March 2011.

Kuji and Ofunato have been "swept away ... leaving no trace that a town was there." Also destroyed was Rikuzentakata, where the tsunami was reportedly three stories high. Other cities reportedly destroyed or heavily damaged by the tsunami include Miyako, Ōtsuchi, and Yamada (all in Iwate Prefecture), Namie, Sōma and Minamisōma (all in Fukushima Prefecture) and Onagawa, Natori, Ishinomaki, and Kesennuma (all in Miyagi Prefecture). The severest effects of the tsunami were felt along a 670-kilometer (420 mi)-long stretch of coastline from Erimo in the north to Oarai in the south, with most of the destruction in that area occurring in the hour following the earthquake.

On 13 March 2011, the Japan Meteorological Agency (JMA) published details of tsunami observations recorded around the coastline of Japan following the earthquake. These observations included tsunami maximum readings of over 3 meters (9.8 ft) at the following locations and times on 11 March 2011, following the earthquake at 14:46 JST:

• 15:12 JST – Iwate Kamaishi-oki – 6.8 m (22 ft)
• 15:15 JST – Ofunato – 3.2 m (10 ft) or more
• 15:20 JST – Ishinomaki-shi Ayukawa – 3.3 m (11 ft) or more
• 15:21 JST – Miyako – 4.0 m (13.1 ft) or more
• 15:21 JST – Kamaishi – 4.1 m (13 ft) or more
• 15:44 JST – Erimo-cho Shoya – 3.5 m (11 ft)
• 15:50 JST – Soma – 7.3 m (24 ft)
• 16:52 JST – Oarai – 4.2 m (14 ft)

These readings were obtained from recording stations maintained by the JMA around the coastline of Japan. Many areas were also affected by tsunamis of 1 to 3 meters (3.3 to 9.8 ft) in height, and the JMA bulletin also included the caveat that "At some parts of the coasts, tsunamis may be higher than those observed at the observation sites." The timing of the earliest recorded tsunami maximum readings ranged from 15:12 to 15:21, between 26 and 35 minutes after the earthquake had struck. The bulletin also included initial tsunami observation details, as well as more detailed maps for the coastlines affected by the tsunamis.

Elsewhere across the Pacific

NOAA animation of the tsunami's propagation

Shortly after the earthquake, the Pacific Tsunami Warning Center (PTWC) issued tsunami watches and warnings for locations in the Pacific. At 07:30 UTC PTWC issued a widespread tsunami warning for the entire Pacific Ocean. The United States West Coast and Alaska Tsunami Warning Center issued a tsunami warning for the coastal areas of California and Oregon from Point Conception, California, to the Oregon-Washington border. In California and Oregon, up to 8 ft (2.4 m) high tsunami surges hit some areas, damaging docks and harbors and causing over US$10 million of damage. Hawaii estimated damage to public infrastructure alone at $3 million, with damage to private property estimated at tens of millions of dollars. A tsunami warning was also advised for the Canadian province of British Columbia, where the potentially affected areas included British Columbia's north coast and the outer west coast of Vancouver Island; waters around the island were deemed dangerous and all boats were grounded for 12 hours, stranding some island residents in the area.

Some South Pacific countries, including Tonga, American Samoa and New Zealand, experienced larger-than-normal waves, but did not report any major damage. Along the Pacific Coast of Mexico and South America, tsunami surges were reported, but in most places caused little or no damage. Peru reported a wave of 1.5 meters (4.9 ft) and over 300 homes damaged. The surge in Chile was large enough to cause some damage.

Russia evacuated 11,000 residents from coastal areas of the Kuril Islands. In the Philippines, waves up to 0.5 meters (1.6 ft) high hit the eastern seaboard of the country.

Casualties

The bottom MODIS satellite image was taken on 26 February, and the top on 13 March, after the tsunami. Sendai is in the upper third of both (the red circle to its immediate north-east marks a fire). Scale bar is 10 km.

Both the earthquake and the resultant tsunami caused many casualties.

The National Police Agency has officially confirmed 19,759 deaths,, 6,242 injured,, and 2,553 people missing across sixteen prefectures. These numbers are expected to significantly increase, with casualties expected to reach tens of thousands.

Prefectural officials and the Kyodo News Agency, quoting local officials, said that 9,500 people from Minamisanriku in Miyagi Prefecture—about a half of the town's population—were unaccounted for. NHK has reported that the death toll in Iwate Prefecture alone may reach 10,000.

Save the Children reports that as many as 100,000 children have been uprooted from their homes; of this, some have been split from their families, since the earthquake occurred during the school day.

On March 14, Kyodo News Agency reported that some 2,000 bodies were found on two shores in Miyagi Prefecture.

It was reported that four passenger trains containing an unknown number of passengers disappeared in a coastal area during the tsunami. One of the trains, on the Senseki Line, was found derailed in the morning; all passengers were rescued by a police helicopter. Der Spiegel later reported that five missing trains in Miyagi Prefecture had been found with all passengers safe, although this information could not be confirmed locally.

By 9:30 UTC on March 11, Google Person Finder, which was previously used in the Haitian, Chilean, and Christchurch, New Zealand earthquakes, was collecting information about survivors and their locations. The Next of Kin Registry NOKR is assisting the Japanese government in locating next of kin for those missing or deceased.

One man was killed in Papua, Indonesia after being swept out to sea. Near Crescent City, California, a 25-year-old man who is said to have been attempting to photograph the oncoming tsunami was swept out to sea and confirmed dead.

Damage and effects

The degree of damage caused by the earthquake and tsunami combined, most due to the tsunami, is enormous. Film of the worst affected towns show nothing more than piles of rubble, with almost no parts of any structures left standing. The extent of the damage was also massive. Estimates of the value of the damage range well into the tens of billions of US dollars; before-and-after satellite photographs of devastated regions show immense damage to many places. Although Japan has invested the equivalent of billions of dollars on anti-tsunami seawalls which line at least 40 percent of its 34,751-kilometer (21,593 mi) coastline and stand up to 12 meters (39 ft) high, the tsunami simply washed over the top of the seawalls, some of which collapsed.

Debris washed out to sea

Nuclear power plants

Main article: 2011 Japanese nuclear incidents

Fukushima I, Fukushima II, Onagawa Nuclear Power Plant and Tōkai nuclear power stations consisting of eleven reactors were automatically shut down following the earthquake. Higashidōri, also on the northeast coast, was already shut down for a periodic inspection. Cooling is needed to remove decay heat for several days after a plant has been shut down. The cooling process is powered by emergency diesel generators, as in the case of Rokkasho nuclear reprocessing plant. At Fukushima I and II tsunami waves overtopped seawalls and destroyed diesel backup power systems, leading to severe problems including two large explosions at Fukushima I and leakage of radiation. Over 200,000 people have been evacuated.

Europe's energy commissioner Guenther Oettinger, in remarks to the European Parliament on 15 March, called the nuclear disaster an "apocalypse", saying that the word was particularly well chosen, and that Tokyo had almost lost control of events at the Fukushima power plant.

Fukushima I and II Nuclear Power Plants

File:2011-03-12 1800 NHK Sōgō channel news program screen shot.jpg

Before and after images of the explosion at Fukushima I Unit 1 reactor

Main articles: Fukushima I nuclear accidents and Timeline of the Fukushima nuclear accidents

Japan declared a state of emergency following the failure of the cooling system at the Fukushima I Nuclear Power Plant, resulting in the evacuation of nearby residents. Officials from the Japanese Nuclear and Industrial Safety Agency have reported that radiation levels inside the plant are up to 1,000 times normal levels, and that radiation levels outside the plant are up to 8 times normal levels. Later, a state of emergency was also declared at the Fukushima II nuclear power plant about 11 km (7 mi) south. This brings the total number of problematic reactors to six.

On March 12, a large explosion, thought to be caused by the buildup of hydrogen gas, blew away the roof and outer walls of the Reactor 1 building, releasing a large cloud of dust and vapor, but the reactor itself was not damaged in the explosion. A BBC journalist reported being stopped 60 km from the blast site by police.

On Sunday, March 13, Japanese authorities admitted that a partial nuclear meltdown could be occurring in Reactors 1 and 3. At 01:17 JST (12 March 16:17 GMT), the Japan Atomic Energy Agency announced that it was rating the Fukushima accident at 4 (accident with local consequences) on the 0–7 International Nuclear Event Scale (INES), below the Three Mile Island accident in seriousness. This has been questioned by the French ASN nuclear safety authority. They say the accident can be classed as a 5 or 6, which would be comparable to or worse than the Three Mile Island accident.

Another explosion occurred at Reactor 3 of the Fukushima I plant just after 11:00 local time on March 14. An exterior wall of the building collapsed, but the reactor vessel was not damaged according to a government spokesperson. At 16:29 UTC on Monday 14 March (14 March 01:29 UTC), the Japanese Nuclear and Industrial Safety Agency announced that the explosion had occurred. The local population was advised by the authorities to stay home until the radioactive situation of the environment is totally clarified. Unlike the other five reactor units, reactor 3 runs on mixed uranium and plutonium oxide, or MOX fuel, making it potentially more dangerous in an incident due to the neutronic effects of plutonium on the reactor and the carcinogenic effects in the event of release to the environment. Tokyo Electric Power Company (TEPCO) is trying to reduce the pressure within the plants by venting contaminated steam from the reactor vessels into the atmosphere. According to Tomoko Murakami, of the nuclear energy group at Japan's Institute of Energy Economics, this would not result in the release of significant radiation. Residents living within a 20 km (12 mi) radius of the Fukushima I plant were evacuated, as well as residents within 3 km (1.9 mi) of the Fukushima II plant.

Additionally, it was reported on 14 Mar at 07:00 EDT that the fuel rods of Reactor 2 at the Fukushima I plant were now fully exposed, and a meltdown of the fuel rods, with the risk of damage to the reactor vessel and a possible radioactive leak, could not be ruled out. As of 14 March, about 160 people have been exposed to dangerous radiation levels near the power stations. One plant employee was killed while operating a crane, eight others have been injured. An additional eleven employees were injured when the Reactor 3 building exploded. Several people received some radiation doses.

On March 15, at 6:10 a.m. local time an explosion occurred at Reactor 2 of the Fukushima I plant. After the explosion, the radiation level spiked to 8,217 microsieverts an hour. The government admitted it was "very probable" that the cores of Reactors 1, 2 and 3 had experienced (partial) meltdowns due to high temperatures. A fourth Fukushima I reactor, Reactor 4, was also rocked by an explosion on March 15. Radiation levels of up to 400 millisieverts (mSv) per hour were recorded near Reactor 4, while 100 mSv per year is considered a safe level.

A US Navy relief group moved from the immediate area after its helicopters detected low-level radiation while returning to their aircraft carrier from a SAR mission, 160 km (100 miles) offshore. The flight absorbed the equivalent amount of earthbound background radiation for a month, in the span of about an hour.

Radiation levels in Saitama reached forty times the normal level at 11:00 (JST) but then receded to ten times the normal level. Local officials have assured the public that this is not a threat to human health.

On March 15, at 11:51 (JST) Japan suspended operations at the stricken Fukushima I nuclear plant after a surge in radiation made it too dangerous for workers to remain at the facility. However, workers returned about an hour later after radiation levels decreased. As of March 16, five plant workers have died and 22 others have been injured. Two others are reported missing. The government raised the national safety standard governing radiation exposure from 100 to 250 mSv per year, so plant workers could continue their work.

Radioactive caesium with 58 Bq per kilogram of water and iodine with 177 Bq per kilogram of water were detected in tap water in Fukushima City, Fukushima at 08:00 JST on March 16.

Onagawa Nuclear Power Plant

A map showing epicenter of earthquake and position of nuclear power plants

A fire from the turbine section of the Onagawa Nuclear Power Plant following the earthquake was reported by Kyodo News. The blaze was in a building housing the turbine, which is sited separately from the plant's reactor, and was soon extinguished.

On 13 March the lowest-level state of emergency was declared regarding the Onagawa plant by TEPCO, as radioactivity readings temporarily exceeded allowed levels in the area of the plant. TEPCO stated this was due to radiation from the Fukushima I nuclear accidents and not from the Onagawa plant itself.

Tōkai Nuclear Power Plant

The number 2 reactor at Tōkai Nuclear Power Plant was shut down automatically. On 14 March it was reported that a cooling system pump for this reactor had stopped working, but the Japan Atomic Power Company stated that there was a second operational pump and cooling was working, but that two of three diesel generators used to power the cooling system were out of order.

Ports

The Port of Tokyo suffered slight damage; the effects of the quake included visible smoke rising from a building in the port with parts of the port areas being flooded, including soil liquefaction in Tokyo Disneyland's carpark. All of Japan's ports were briefly closed after the earthquake, though the ones in Tokyo and southwards soon re-opened. The north-eastern ports of Hachinohe, Sendai, Ishinomaki and Onahama were destroyed, while Chiba port (which serves the hydrocarbon industry) and Japan's ninth-largest container port at Kashima were also affected though less severely. The ports at Hitachinaka, Hitachi, Soma, Shiogama, Kesennuma, Ofunato, Kamashi and Miyako were also damaged and were expected to be out of action for weeks.

Dam failure

The Fujinuma irrigation dam in Sukagawa ruptured, causing flooding and washing away homes. Eight people were missing and four bodies were discovered by the morning. Reportedly, some locals had attempted to repair leaks in the dam before it completely failed. On March 12, 252 dams were inspected and it was discovered that six embankment dams had shallow cracks on their crests. The reservoir at one concrete gravity dam suffered a small non-serious slope failure. All damaged dams are functioning with no problems though. Four dams within the quake area were unreachable. When the roads clear, experts will be dispatched to conduct further investigations.

Water

At least 1.5 million households were reported to have lost access to water supplies.

Electricity

According to Tohoku Electric, around 4.4 million households in northeastern Japan were left without electricity. Several nuclear and conventional power plants went offline after the earthquake. Rolling blackouts began on 14 March due to power shortages caused by the earthquake. The Tokyo Electric Power Company (Tepco), which normally provides approximately 40 GW of electricity, announced that it can currently provide only about 30 GW. This is because 40 percent of the electricity used in the greater Tokyo area is now supplied by reactors in the Niigata and Fukushima prefectures. Two of those reactors, the Fukushima Dai-ichi and Fukushima Dai-ni, were automatically taken offline when the first earthquake occurred and have sustained major damage related to the earthquake and subsequent tsunami. Rolling blackouts of three hours are expected to last until the end of April and will affect the Tokyo, Kanagawa, Shizuoka, Yamanashi, Chiba, Ibaraki, Saitama, Tochigi, and Gunma prefectures.

Tohoku Electric Power (TEP) cannot currently provide the Kanto region with additional power, because TEP's power plants were also damaged in the earthquake. Kansai Electric Power Company (Kepco) cannot share electricity, because its system operates at 60 hertz, whereas Tepco's and TEP's operate at 50 hertz. Two substations, one in Shizuoka Prefecture and one in Nagano Prefecture, can convert between frequencies and transfer electricity from Kansai to Kanto and Tohoku, but their capacity to do so is limited to 1 GW. With the damage to so many power plants, it could be years before electricity productions levels in eastern Japan return to pre-quake levels.

Oil

Fire at the Cosmo Oil refinery in Ichihara

A 220,000-barrel-per-day oil refinery of Cosmo Oil Company was set on fire by the quake at Ichihara, Chiba Prefecture, to the east of Tokyo. Major fires broke out elsewhere, such as in the city of Kesennuma.

In Sendai, a 145,000-barrel-per-day refinery owned by the largest refiner in Japan, JX Nippon Oil & Energy, was also set ablaze by the quake. Workers were evacuated, but tsunami warnings hindered efforts to extinguish the fire until 14 March, when officials planned to do so.

Transport

Japan's transport network suffered severe disruption. Many sections of Tohoku expressway serving northern Japan were damaged. All railway services were suspended in Tokyo, with an estimated 20,000 people stranded at major stations across the city. In the hours after the earthquake, some train services were resumed. Most Tokyo area train lines resumed full service by the next day-12 March. Twenty thousand stranded visitors spent the night of 11–12 March inside Tokyo Disneyland.

A tsunami wave flooded Sendai Airport at 15:55 JST, about 1 hour after the initial quake. Narita and Haneda Airport both suspended operations after the quake, with most flights diverted to other airports for about 24 hours. Ten airliners bound for Narita were diverted to nearby Yokota Air Base.

Stranded passengers on a Tokyo train. Major disruptions to train travel, as well as car and airplane travel, have occurred in places such as Tokyo and northeastern Japan.

Various train services around Japan were also canceled, with JR East suspending all services for the rest of the day. Four trains on coastal lines were reported as being out of contact with operators; one, a four-car train on the Senseki Line, was found to have derailed, and its occupants were rescued shortly after 8 am the next morning. There had been no derailments of Shinkansen bullet train services in and out of Tokyo, but their services were also suspended. The Tōkaidō Shinkansen resumed limited service late in the day and was back to its normal schedule by the next day, while the Jōetsu and Nagano Shinkansen resumed services late on 12 March; however, the Tōhoku Shinkansen remained suspended, with visible damage to electrical poles and elevated spans, and the state of the line in harder-hit areas still difficult to ascertain. Services on the Tōhoku Shinkansen partially resumed on 15 March, with one round-trip service per hour between Tokyo and Nasu-Shiobara.

The entirety of JR East's Kesennuma Line was obliterated, save for the platform of Minami-Kesennuma Station.

The rolling blackouts brought on by the crises at the nuclear power plants in Fukushima later had a profound effect on the rail networks around Tokyo starting on 14 March. Major railways began running trains at 10–20 minute intervals (normally 3–5 minutes), operating some lines only at rush hour, and completely shutting down others (notably, the Tokaido Main Line, Yokosuka Line, Sobu Main Line and Chuo-Sobu Line were all stopped for the day). This led to near-paralysis within the capital, with long lines at train stations and many people unable to come to work or get home.

Telecommunications

Cellular and landline phone service suffered major disruptions in the affected area. Internet services, however, were to a large extent able to reroute around the damage; only a few websites were initially unreachable. Several Wi-Fi hotspot providers have reacted to the quake by providing free access to their networks.

Space center

JAXA (Japan Aerospace Exploration Agency) evacuated the Tsukuba Space Center in Tsukuba, Ibaraki. The Tsukuba Space Center has been shut down, with some damage reported. The Tsukuba Space Center houses a control room for part of the International Space Station.

Sports

The 2011 World Figure Skating Championships were scheduled to take place from 21–27 March at the Yoyogi National Gymnasium in Tokyo but the International Skating Union decided on 14 March to postpone the event, after the German team announced that it would follow recommendations not to travel to Japan. International Skating Union President Ottavio Cinquanta published a statement on the federation website on March 15, confirming the cancellation of the event. However, the possibility of re-scheduling remains, said the ISU chief. "The postponement of the event or alternatively the final cancellation is under evaluation."

Also on hold is the ISU Figure Skating World Team Trophy, scheduled for Yokohama on April 14–17. The ISU is waiting for guidance from Japanese authorities on whether the skating championships can be held. "It is understood that a postponement of the above-mentioned World Championships as well as the holding of the ISU World Team Trophy is subject to the confirmation by the competent Japanese authorities that the situation is back to normal conditions allowing the safe conduct of major ISU sports Events in the Tokyo area," says the ISU.

The 2011 Japanese motorcycle Grand Prix, originally scheduled for 24 April, was moved to 2 October.

The 2011 Asia League Ice Hockey finals between the Tohoku Free Blades and Anyang Halla were to begin on 11 March but the 5 games have since been canceled. No reschedule dates have been announced as of yet.

Economic impact

An aerial view of the Sendai port, 12 March. Some analysts are predicting that the total recovery costs could reach ¥10 trillion ($122 billion).

Empty instant noodle shelves in a supermarket in Tokyo due to logistic stack and buyout.

The northern Tohoku region, which was most affected, accounts for about 8 percent of the country's gross domestic product, with factories that make products such as cars and beer as well as energy infrastructure. It includes the northern Miyagi prefecture, where Sendai is located, about 300 km (180 miles) northeast of Tokyo. The Miyagi area includes manufacturing and industrial zones with chemical and electronics plants. It is estimated that Miyagi accounts for 1.7% of Japan’s gross domestic product.

The earthquake and tsunami have had significant immediate impacts on businesses such as Toyota, Nissan and Honda, which completely suspended auto production until 14 March. Nippon Steel Corporation also suspended production, Toyo Tire & Rubber Company and Sumitomo Rubber Industries shuttered their tire and rubber production lines, while GS Yuasa closed its automotive battery production. This was expected to hinder supply availability for automakers. Tokyo Electric Power Company, Toshiba, East Japan Railway Company and Shin-Etsu Chemical were suggested as the most vulnerable companies as a result of the earthquake. Sony also suspended production at all its six plants in the area, while Fuji Heavy Industries discontinued production at most of its factories in the Gunma and the Tochigi Prefectures. Other factories suspending operations include Kirin Holdings, GlaxoSmithKline, Nestlé and Toyota amid power cuts. The factory shutdowns, power cuts and the consequent presumed impact on consumer confidence could hurt the national GDP for several months, although economist Michael Boskin predicts "only minimal impact on the Japanese economy overall." Following threats of further nuclear leaks, Blackstone Group LP, Continental AG and Bayerische Motoren Werke AG (BMW) were said to be moving their staff outside Japan.

Chief economist for Japan at Credit Suisse, Hiromichi Shirakawa, said in a note to clients that the estimated economic loss may be around $171–183 billion just to the region which was hit by the quake and tsunami. On 14 March, the Bank of Japan, in an attempt to maintain market stability, injected 15 trillion yen into the money markets to assure financial stability amid a plunge in stocks and surge in credit risk. After it set up an emergency task force to ensure liquidity in the aftermath of the disaster, governor Masaaki Shirakawa and the bank's board also enlarged a programme to buy government bonds to exchange-traded funds to the tune of 10 trillion yen. The BOJ chief told reporters cash injections will continue as needed. However, following the further nuclear leaks, its actions were read by the market as insufficient despite 8 trillion yen being pumped into the market. On 15 March, the Topix index fell again marking a two-day plunge not seen since 1987 as Japan's default risk surged after Prime Minister Naoto Kan warned of further leaks from the damaged nuclear power plant. Commodities were also significantly lower. Residents of Tokyo were also reported to have gone on a panic shopping spree as daily necessities were sought after and gasoline was stocked up with the increasing risk of nuclear radiation leaks.

Chief Cabinet Secretary Yukio Edano has said that Japan's government will convene on 13 March to gauge the economic effects of the catastrophe. He also told NHK Television that about 200 billion yen that was remaining from the budget for the concurrent fiscal year that would end on 31 March would be used to fund the immediate recovery efforts. Additional measures could also hurt Japan's public debt (which is already the highest in the world). This additional spending could hurt demand for government bonds.

Some economic analysts consider that, ultimately, the catastrophe will improve Japan's economy, with increased job availability during restoration efforts. An analyst at JPMorgan Chase, citing the 1989 San Francisco earthquake and the 1994 Northridge earthquake, noted that natural disasters "do eventually boost output." An analyst at Société Générale anticipated that Japan's economy will decline in March but will revive powerfully in subsequent months. After the Kobe earthquake, industrial output dropped 2.6%, but increased by 2.2% the next month, and 1% the following month. Japan's economy then accelerated substantially through the next two years, at more than its former rate. Others are of the opinion that the catastrophe will harm the economy. Some have argued that those who predict that the reconstruction effort could help Japan's economy fall into the broken window fallacy.

Global financial impact

In the immediate aftermath of the earthquake, Japan’s Nikkei stock market index saw its futures slide 5% in after-market trading. The Bank of Japan said that they would do their utmost to ensure financial market stability. On Tuesday, March 15, news of rising radiation levels caused the Nikkei to drop over 1,000 points or 10.6% (16% for the week).

Other stock markets around the world were also affected; the German DAX lost 1.2% and fell to 6,978 points within minutes. Hong Kong's Hang Seng index fell by 1.8%, while South Korea's Kospi index slumped by 1.3%. By the end of trading on Friday, the MSCI Asia Pacific Index had dropped by 1.8%. Major U.S. stock market indexes rose between 0.5% and 0.7%. Oil prices also dropped as a result of the closure of Japanese refineries, despite the ongoing violence in Libya and expected demonstrations in Saudi Arabia. US crude dropped as low as $99.01 from $100.08 by lunchtime, with Brent Crude falling $2.62 to $112.81. In Hong Kong, Financial Secretary John Tsang warned investors to "take extra care" as the earthquake may have a short term impact on each local stock market.

The share prices of the biggest reinsurance companies Munich Re and Swiss Reinsurance Company fell following the earthquake on speculation that they may face losses "somewhere in the $10 billion range" even after certain costs were absorbed by Japan’s primary insurers and the government.

Peter Bradford, a former member of the United States' Nuclear Regulatory Commission, said that the impact on the nuclear power plant was "obviously a significant setback for the so-called nuclear renaissance. The image of a nuclear power plant blowing up before your eyes on a television screen is a first."

Geological impact

The earthquake caused Earth to spin faster, according NASA scientists. Earth spins faster than before, and an Earth day has become 1.8 microseconds shorter which results in a slightly shorter time from sunrise to sunset. The axis of the Earth has changed by 15 centimeters. A team of scientists at NASA’s Jet Propulsion Laboratory calculated the change in Earth’s rate of spin, using computers and earthquake data.

Response

A human chain helps speed unloading of a rescue flight

Government response

Prime Minister Naoto Kan announced the government has mobilized the Japanese Self-Defense Forces in various earthquake disaster zones. He asked the Japanese public to act calmly and tune into various media for updated information. He also reported numerous nuclear power plants have automatically shut down to prevent damage and radiation leaks. He also set up emergency headquarters in his office to coordinate the government's response.

Evacuation shelters currently are facing a shortage of potable water, food, blankets and bathroom facilities, as the government arranges these necessities to be delivered to where they are needed as soon as possible, from various areas of Japan and abroad. Dropping temperatures due to the disruption in electrical and gas lines caused further problems at shelters.

A Japanese urban search and rescue team in New Zealand following the 2011 Christchurch earthquake was recalled.

Request for international assistance

Japan specifically requested teams from Australia, New Zealand, South Korea, the United Kingdom, and the United States; it also requested, via its space agency JAXA, the activation of the International Charter on Space and Major Disasters, allowing diverse satellite imagery of affected regions to be readily shared with rescue and aid organizations.

International response

Main article: Humanitarian response to the 2011 Sendai earthquake and tsunami

Japan received messages of condolence and offers of assistance from a range of international leaders. According to Japan's foreign ministry on 15 March 2011, 102 countries and 14 international organizations had offered assistance to Japan. The EU has also been more than ready to offer its support: "An earthquake powerful enough to make the world wobble on its axis, a massive tsunami, an emergency in nuclear power stations. Any one of these would be a tragedy. Thousands of people have died and this has turned this tragedy into a catastrophe," said Herman van Rompuy, President of the European Council. Twenty Member States have offered assistance through the European Civil Protection Mechanism.

The Fukushima incident brought the issue of nuclear power to the fore internationally, causing an anti-nuclear demonstration of 50,000 people in Stuttgart and the cancellation of a pro-nuclear press conference in the United Kingdom.

In many countries, both government and private aid campaigns have been organized to offer money and support to the victims and general populace of Japan. Social buying sites have launched on-line campaigns in which several million dollars were raised for relief organizations working in Japan.

Operation Tomodachi, which means friend in Japanese, was a United States military operation to provide assistance and humanitarian aid to Japan.

Information and support

Among several resources offered to help find earthquake survivors and obtain information about people in Japan are: Disaster Message Board Web171 operated by Nippon Telegraph and Telephone, the International Committee of the Red Cross, American Red Cross, Google Person Finder, websites of the Australian Embassy, US Department of State, UK Foreign and Commonwealth Office, and the Honshu Quake wiki operated by the CrisisCommons volunteer community.

Media coverage

Japan's national public broadcaster, NHK, and Japan Satellite Television suspended their usual programming to provide ongoing coverage of the situation. Various other nationwide Japanese TV networks also broadcast uninterrupted coverage of the disaster. Ustream Asia broadcast live feeds of NHK, Tokyo Broadcasting System, Fuji TV, TV Asahi, TV Kanagawa, and CNN on the Internet starting on 12 March 2011.

Scientific and research response

According to the chief scientist for the Multi-Hazards project at the U.S. Geological Survey, the fact that the Sendai earthquake took place in Japan – a country with "the best seismic information in the world" – meant that for the first time it was hoped that data had been collected that would allow modeling of an earthquake of this type and severity in great detail. Andreas Reitbrock, a professor of seismology at the University of Liverpool, agreed, stating that "It gives us, for the first time, the possibility to model in great detail what happened during the rupture of an earthquake."

The effect of this data is expected to be felt across other disciplines as well. Tom Heaton, a seismological engineer, commented that "the tragedy would provide unprecedented information about how buildings hold up under long periods of shaking — and thus how to build them better. We had very little information about that before now". James Cave, Associate Professor of Earth and Planetary Sciences at Harvard University said that data retrieved from the Sendai quake could provide new details in "quake-proofing" large urban areas in the future.

See also

• Historic tsunamis
• Impact of the 2011 Sendai earthquake and tsunami on the video game industry
• 2004 Indian Ocean earthquake
• 1978 Miyagi earthquake which also occurred near Sendai
• List of earthquakes in Japan
• Minamisanriku, Miyagi
• Seismicity in Japan
• Tokyo Magnitude 8.0

External links

• Earthquake Swarm Google Earth Animation
• Earthquake Report from United States Geological Survey (USGS)
• Pacific Tsunami Warning Center at National Oceanic and Atmospheric Administration (NOAA)
• U.S. Pacific Command (PACOM) Japan Earthquake Response
• West Coast and Alaska Tsunami Information at National Oceanic and Atmospheric Administration (NOAA)
• Seismic Monitor at Incorporated Research Institutions for Seismology (IRIS)
• Integrated Tsunami Watcher Service
• Japan Earthquake & Tsunami at Esri
• Japan Disaster: Most Shocking Pics – slideshow by Life magazine
• Images of affected areas from Boston.com
• Japan Earthquake: before and after aerial and satellite images from ABC News, credited to Google
• Satellite Photos of Japan, Before and After the Quake and Tsunami (The New York Times)
• Diverse satellite imagery taken under the aegis of the International Charter on Space and Major Disasters
• 110311 JapanEarthquake at the Federation of Earth Science Information Partners (ESIP Federation)
• 2011 Japanese Earthquake and Tsunami at Google Crisis Response
• Red Earthquake and Tsunami Alert in Japan at the Global Disaster Alert and Coordination System
• Japan Earthquake and Tsunami Datafeeds gathering and Japan Data Profile inputs for Common Operational Datasets at CrisisCommons
• Catastrophe bonds at risk of loss due to the earthquake (from Artemis.bm)
• Japan earthquake: disaster by numbers
• Humanitarian information coverage on ReliefWeb
• Fukushima I radiation plume projections at various altitudes

Live media coverage

• Japan earthquake live coverage at Al Jazeera English
• Japan earthquake live coverage at BBC News
• Japan tsunami and earthquake live coverage at The Guardian
• Quake and tsunami live coverage at The New York Times
• Japan Earthquake live coverage at Reuters
• NHK WORLD English live coverage at Japan Broadcasting Corporation (NHK)