InSAR-Constrained Interseismic Deformation and Potential Seismogenic Asperities on the Altyn Tagh Fault at 91.5–95°E, Northern Tibetan Plateau
Abstract
:1. Introduction
2. InSAR Observations
2.1. InSAR Data Processing Strategy
2.2. InSAR Velocity Field
2.3. Evaluation of the InSAR-Derived Velocity
2.3.1. Validation of Overlapping Regions from Adjacent Tracks
2.3.2. Comparison with GPS Data
3. Interseismic Deformation Modeling
3.1. Fault Geometry
3.2. Slip Deficit Rates Distribution along the ATF at 91.5–95°E
3.2.1. Preprocessing InSAR Deformation Results
3.2.2. Modeling Approach
3.2.3. Modeling Results
4. Discussion
4.1. Local Nontectonic Deformation Detected in the InSAR Map
4.2. Possible Tectonic Deformation Mechanism of the Northern Tibetan Plateau
4.3. Comparison of Coupling and Seismicity
4.4. Seismic Potential of the ATF at 91.5–95°E
4.5. Present-Day Slip Rate and Locking Depth Variations along the Entire ATF from GPS and InSAR
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Track | Satellites | Number of Images and Interferograms | Images Used | Interferograms Used |
---|---|---|---|---|
176 | ERS-1/2 | 24 (119) | 13 | 49 |
Envisat | 40 (435) | 20 | 65 | |
405 | ERS-1/2 | 25 (113) | 16 | 35 |
Envisat | 24 (123) | 13 | 43 | |
133 | ERS-1/2 | 27 (162) | 13 | 35 |
Envisat | 45 (519) | 23 | 60 |
NO. | Bperp (Meter) | Btemp (Day) |
---|---|---|
1 | 400 m < Bperp < 600 m | 350 day < Delta_T ≤ 500 day |
2 | 200 m < Bperp ≤ 400 m | 500 day < Delta_T ≤ 1000 day |
3 | Bperp ≤ 200 m | 1000 day < Delta_T |
NO. | Longitude (°E) | Slip Rate (mm/year) | Locking Depth (km) | Data Source | Reference |
---|---|---|---|---|---|
A | 78 | 1 ± 2 | NA | InSAR | [16] |
B | 79–80 | 5 ± 5 | 15 | InSAR | [15] |
C | 78.4–80.2 | 1.4 ± 1.3 | 28 ± 35 | GPS | [10] |
D | 80 | 2 ± 2 | NA | InSAR | [16] |
E | 84–86 | 11 ± 5 | 15 (+10/+20) | InSAR | [18] |
F | 84–86 | 8 ± 0.7 | 14.5 ± 3 | InSAR | [19] |
G | 84.5–86.5 | 10.5 ± 1.0 | 17.4 (−3/+2.6) | InSAR | [17] |
H | 84.2–87.8 | 8.1 ± 0.7 | 13 ± 4 | GPS | [10] |
I | 84.8–87.5 | 8.6 (−3.2/+4.2) | 14.5 (−14.5/+15.5) | GPS | [25] |
J | 85–90 | 9 ± 2 | NA | GPS | [23] |
K | 85.6–86.4 | 9.0 (−3.2/+4.4) | 14.5 | GPS | [22] |
L | 86.8 | 9 ± 2 | 14 ± 4 | InSAR | [24] |
M | 89.4 | 7.4 ± 0.2 | NA | GPS | [27] |
N | 89–91 | 9 ± 5 | 8–36 | GPS | [20] |
O | 89–91 | 9 ± 4 | 20 | GPS | [26] |
P | 89–91 | 11.9 ± 3.3 | 15 | GPS | [28] |
Q | 88.7–91.4 | 9 ± 5 | 25 (+5/−20) | GPS | [25] |
R | 88.6–92.2 | 8.6 ± 1.5 | 12 ± 2 | GPS | [10] |
S | 93–95 | 8–10 | 7–9 | InSAR | [21] |
T | 93–95 | 8.8 ± 2.3 | 15 | GPS | [28] |
U | 93.3–96 | 4.5 ± 0.9 | 8 ± 6 | GPS | [10] |
V | 95–97 | 3.9 ± 2.3 | 15 | GPS | [28] |
This Study | 91.5–95 | 6.4 ± 1.6 | 15 ± 4 | InSAR |
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Liu, C.; Ji, L.; Zhu, L.; Zhao, C. InSAR-Constrained Interseismic Deformation and Potential Seismogenic Asperities on the Altyn Tagh Fault at 91.5–95°E, Northern Tibetan Plateau. Remote Sens. 2018, 10, 943. https://doi.org/10.3390/rs10060943
Liu C, Ji L, Zhu L, Zhao C. InSAR-Constrained Interseismic Deformation and Potential Seismogenic Asperities on the Altyn Tagh Fault at 91.5–95°E, Northern Tibetan Plateau. Remote Sensing. 2018; 10(6):943. https://doi.org/10.3390/rs10060943
Chicago/Turabian StyleLiu, Chuanjin, Lingyun Ji, Liangyu Zhu, and Chaoying Zhao. 2018. "InSAR-Constrained Interseismic Deformation and Potential Seismogenic Asperities on the Altyn Tagh Fault at 91.5–95°E, Northern Tibetan Plateau" Remote Sensing 10, no. 6: 943. https://doi.org/10.3390/rs10060943