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2025年1月7日定日MW7.1地震同震形变与断层滑动分布
张旭, 洪顺英, 董彦芳, 刘泰, 杨君妍, 贺俊玉
PDF(8893 KB)
PDF(8893 KB)
2025年1月7日定日MW7.1地震同震形变与断层滑动分布
2025年1月7日西藏自治区日喀则市定日县发生M W7.1地震，震中位置位于申扎‒定结裂谷断系南端和藏南拆离系断裂的交汇处，靠近登么错断裂.为深入了解此次地震的发震机制、滑动分布以及库仑应力扰动，首先利用Sentinel-1A数据，通过InSAR及POT测量技术获取其同震形变场信息；然后，利用SDM程序进行断层滑动分布反演，继而计算不同深度的同震库仑应力扰动.研究结果表明： 定日地震同震变形以地表沉降为主；发震断层走向近南北，断层倾角约60°；断层滑动分布反演表明主要破裂区域（滑动量>1 m）的长度约40 km、宽度约14 km；最大滑动量约4.45 m，位于断层深度约4.33 km；平均滑动角约-76.81°，表明此次地震是一次以正断破裂为主兼具略微左旋走滑的事件；当剪切模量取30 GPa时，反演的地震矩约3.53×1019 N·m，相当于矩震级M W7.0.早期余震主要分布于主破裂区域外围.另外，同震与震后库仑应力扰动表明，申扎‒定结断裂南端、札达‒拉孜‒邛多江断裂东侧、达吉岭‒昂仁‒仁布断裂中部及东侧、与雅鲁藏布江断裂中部的库仑应力增加明显大于阈值10 kPa，其未来地震风险值得关注.
On January 7, 2025, an M W7.1 earthquake struck Dingri County, Shigatse City, Xizang Autonomous Region. The epicenter was located at the intersection of the southern segment of the Shenzha-Dingjie rift fault system and the South Tibetan detachment system, near the Dengmocuo fault. To investigate the seismogenic mechanism, slip distribution, and Coulomb stress disturbances of the earthquake, this study firstly utilized the Sentinel-1A data to obtain the coseismic deformation fields by InSAR (interferometric synthetic aperture rader) and POT (pixel offset tracking) techniques. Then, we employed the SDM program to invert the fault coseismic slip-distribution, and subsequently calculated the coseismic Coulomb stress disturbances with variable depth. The results indicate that the coseismic deformation of the Dingri earthquake is dominated by subsidence. The seismogenic fault strikes nearly north-south, with a dip angle of ~60°. The inverted coseismic slip-distribution suggests that the major rupture zone (slip >1 m) extends ~40 km in length and ~14 km in width. The maximum slip is approximately 4.45 m, occurring at a depth of ~4.33 km. The average rake angle is approximately ‒76.81°, indicating that this earthquake was predominantly a normal faulting event with a slight left-lateral strike-slip component. Taken the shear modulus at 30 GPa, the inverted seismic moment is about 3.53×1019 N·m, equivalent to the moment magnitude M W7.0. Aftershocks predominantly happened around the periphery of the major slip zone. Additionally, the coseismic and postseismic Coulomb stress disturbances suggest significant increases (>10 kPa) in the southern segment of Shenzha-Dingjie fault, the eastern segment of Zanda-Lhaze-Qongdojiang fault, the central-eastern segment of Dagyiling-Ngamring-Rinbung fault, and the central segment of Yarlung Tsangpo fault. The future seismic hazards on these fault segments warrant heightened attention.
定日 / 地震 / InSAR / POT / 断层滑动分布 / 库仑应力 / 灾害.
Dingri / earthquakes / InSAR / POT / fault slip distribution / Coulomb stress / hazards
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Ammon, C. J., Ji, C., Thio, H. K., et al., 2005. Rupture Process of the 2004 Sumatra-Andaman Earthquake. Science, 308(5725): 1133-1139. https://doi.org/10.1126/science.1112260
|
|
Bai, L., Chen, Z. W., Wang, S. J., 2025. The 2025 Dingri 6.8 Earthquake in Xizang: Analysis of Tectonic Background and Discussion of Source Characteristics. Reviews of Geophysics and Planetary Physics, 56(3): 258-263 (in Chinese).
|
|
Chen, F., Diao, F. Q., Haghighi, M. H., et al., 2024. Mechanism and Implications of the Post-Seismic Deformation Following the 2021 M W7.4 Maduo (Tibet) Earthquake. Geophysical Journal International, 237(1): 203-216. https://doi.org/10.1093/gji/ggae034
|
|
Chlieh, M., Avouac, J. P., Hjorleifsdottir, V., et al., 2007. Coseismic Slip and Afterslip of the Great M W9.15 Sumatra-Andaman Earthquake of 2004. Bulletin of the Seismological Society of America, 97(1A): S152-S173. https://doi.org/10.1785/0120050631
|
|
Delouis, B., Nocquet, J. M., Vallée, M., 2010. Slip Distribution of the February 27, 2010 M W= 8.8 Maule Earthquake, Central Chile, from Static and High-Rate GPS, InSAR, and Broadband Teleseismic Data. Geophysical Research Letters, 37(17): L17305. https://doi.org/10.1029/2010GL043899
|
|
Farr, T. G., Rosen, P. A., Caro, E., et al., 2007. The Shuttle Radar Topography Mission. Reviews of Geophysics, 45(2): RG2004. https://doi.org/10.1029/2005RG000183
|
|
Hong, S. Y., Liu, M., Liu, T., et al., 2022. Fault Source Model and Stress Changes of the 2021 M W7.4 Maduo Earthquake, China, Constrained by InSAR and GPS Measurements. Bulletin of the Seismological Society of America, 112(3): 1284-1296. https://doi.org/10.1785/0120210250
|
|
Jiang, G. Y., Wen, Y. M., Liu, Y. J., et al., 2015. Joint Analysis of the 2014 Kangding, Southwest China, Earthquake Sequence with Seismicity Relocation and InSAR Inversion. Geophysical Research Letters, 42(9): 3273-3281. https://doi.org/10.1002/2015GL063750
|
|
Jónsson, S., Zebker, H., Segall, P., et al., 2002. Fault Slip Distribution of the 1999 M W7.1 Hector Mine, California, Earthquake, Estimated from Satellite Radar and GPS Measurements. Bulletin of the Seismological Society of America, 92(4): 1377-1389. https://doi.org/10.1785/0120000922
|
|
Laske, G., Masters, G., Ma, Z., et al., 2013. Update on CRUST1. 0-A 1-Degree Global Model of Earth’s Crust. Geophysical Research Abstracts, 15(15): 2658.
|
|
Lay, T., Kanamori, H., Ammon, C. J., et al., 2005. The Great Sumatra-Andaman Earthquake of 26 December 2004. Science, 308(5725): 1127-1133. https://doi.org/10.1126/science.1112250
|
|
Li, Y. S., Li, W. L., Xu, Q., et al., 2025. InSAR Coseismic Deformation Detection and Fault Slip Distribution Inversion of the M S6.8 Earthquake in Dingri, Tibet on January 7, 2025. Journal of Chengdu University of Technology (Science & Technology Edition), 52(2): 199-211 (in Chinese with English abstract).
|
|
Miao, M., Zhu, S. B., 2012. A Study of the Impact of Static Coulomb Stress Changes of Megathrust Earthquakes along Subduction Zone on the Following Aftershocks. Chinese Journal of Geophysics, 55(9): 2982-2993 (in Chinese with English abstract).
|
|
Ozawa, S., Nishimura, T., Suito, H., et al., 2011. Coseismic and Postseismic Slip of the 2011 Magnitude-9 Tohoku-Oki Earthquake. Nature, 475(7356): 373-376. https://doi.org/10.1038/nature10227
|
|
Pollitz, F. F., Brooks, B., Tong, X. P., et al., 2011. Coseismic Slip Distribution of the February 27, 2010 M W8.8 Maule, Chile Earthquake. Geophysical Research Letters, 38(9): L09309. https://doi.org/10.1029/2011GL047065
|
|
Rosen, P. A., Gurrola, E., Sacco, G. F., et al., 2012. The InSAR Scientific Computing Environment. EUSAR 2012, 9th European Conference on Synthetic Aperture Radar, Nuremberg, 730-733.
|
|
Sheng, S. Z., Wang, Q. R.,Li Z.Y., et al., 2025. Investigation of the Seismogenic Structure of the 2025 Dingri M S6.8 Earthquake in Xizang Base on the Tectonic Stress Filed Perspective. Seismology and Geology, 47(1): 49-63 (in Chinese with English abstract).
|
|
Shi, F., Liang, M. J., Luo, Q. X., et al., 2025. Seismogenic Fault and Coseismic Surface Deformation of the Dingri M S6.8 Earthquake in Xizang, China. Seismology and Geology, 47(1): 1-15 (in Chinese with English abstract).
|
|
Wang, N., Li, Y. S., Shen, W. H., et al., 2025. Source Parameters and Rapid Simulation of Strong Ground Motion of the M S6.8 Earthquake on January 7, 2025 in Dingri (Xizang, China) Derived from InSAR Observation. Geomatics and Information Science of Wuhan University, 50(2): 404-411 (in Chinese with English abstract).
|
|
Wang, R., Diao, F., Hoechner, A., 2013. SDM-A Geodetic Inversion Code Incorporating with Layered Crust Structure and Curved Fault Geometry. EGU General Assembly Conference, Vienna, 2411.
|
|
Wang, R. J., Lorenzo-Martín, F., Roth, F., 2006. PSGRN/PSCMP—A New Code for Calculating Co- and Post-Seismic Deformation, Geoid and Gravity Changes Based on the Viscoelastic-Gravitational Dislocation Theory. Computers & Geosciences, 32(4): 527-541. https://doi.org/10.1016/j.cageo.2005.08.006
|
|
Wang, Y. Z., 2015. Coseismic Slip Distribution of the 2011 Tohoku M W9.0 Earthquake Inferred from GPS and InSAR Data. Acta Seismologica Sinica, 37(5): 796-805 (in Chinese with English abstract).
|
|
Wei, B. Y., Zhang, Y. M., Shi, F., et al., 2025. Analysis of Building Damage and Casualties of the 2025 Dingri M S6.8 Earthquake in Xizang Based on Field Investigation. Seismology and Geology, 47(1): 64-79 (in Chinese with English abstract).
|
|
Xu, C. J., He, P., W, Y. M., et al., 2012. Coseismic Deformation Slip Distribution for 2011 Tohoku-Oki M W9.0 Earthquake: Constrained by GPS and InSAR. Geomatics and Information Science of Wuhan University, 37(12): 1387-1391 (in Chinese with English abstract).
|
|
Xu, X. W., Han, Z. J., Yang, X. P., et al., 2016. Seismotectonic Map in China and Its Adjacent Regions. Seismological Press, Beijing (in Chinese).
|
|
Xu, X. W., Wang, S. G., Cheng, J., et al., 2025. Shaking the Tibetan Plateau: Insights from the M W7.1 Dingri Earthquake and Its Implications for Active Fault Mapping and Disaster Mitigation. NPJ Natural Hazards, 2: 16. https://doi.org/10.1038/s44304-025-00074-7
|
|
Yang, J. W., Jin, M. P., Ye, B., et al., 2025. Source Rupture Mechanism and Stress Changes to the Adjacent Area of January 7, 2025, M S6.8 Dingri Earthquake, Xizang, China. Seismology and Geology, 47(1): 36-48. (in Chinese with English abstract).
|
|
Yang, T., Wang, S. G., Fang, L. H., et al., 2025. Analysis of Earthquake Sequence and Seismogenic Structure of the 2025 M S6.8 Dingri Earthquake in Tibetan Plateau. Earth Science, 50(5): 1721-1732 (in Chinese with English abstract). https://doi.org/10.3799/dqkx.2025.033
|
|
Yu, C., Li, Z. H., Hu, X. N., et al., 2025a. Source Characteristics and Induced Hazards of the 2025 M W6.8 Dingri Earthquake, Xizang, China, Revealed by Imaging Geodesy. Journal of Earth Science, 36(2): 847-851. https://doi.org/10.1007/s12583-025-0175-8
|
|
Yu, S. Y., Zhang, S. B., Luo, J. J., et al., 2025b. The Tectonic Significance of the M W7.1 Earthquake Source Model in Tibet in 2025 Constrained by InSAR Data. Remote Sensing, 17(5): 936. https://doi.org/10.3390/rs17050936
|
|
Zhang, J. J., Guo, L., Ding, L., 2002. Structural Characteristics of the Middle and Southern Segment of the Shenzha-Dingjie Normal Fault System and Its Relationship with the Detachment System in Southern Tibet. Chinese Science Bulletin, 47(10): 738-743 (in Chinese).
|
|
Zhang, X. T., Jiang, X. H., Xue, Y., et al., 2020. Summary of the Dingri M S5.9 Earthquake in Tibet on March 20, 2020. Seismological and Geomagnetic Observation and Research, 41(4): 193-203 (in Chinese with English abstract).
|
|
Zhang, Y., Xu, L. S., Chen, Y. T., 2012. Rupture Process of the 2011 Tohoku Earthquake from the Joint Inversion of Teleseismic and GPS Data. Earthquake Science, 25(2): 129-135. https://doi.org/10.1007/s11589-012-0839-1
|
感谢两位匿名审稿人与助理编辑提出的宝贵修改意见.欧空局Sentinel-1A卫星数据下载自美国阿拉斯加卫星服务中心（https://asf.alaska.edu/）；降采样后的同震变形数据与断层滑动模型可以从figshare下载（https://figshare.com/s/5fcfb99d56c6e151ecf4）.文中大部分图件由GMT软件生成！
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