YANG Jiuyuan,WEN Yangmao,XU Caijun.Coseismic Rupture Behavior of the 2024 Nima (Xizang,China) Mw6.0 Earthquake Revealed by InSAR Observations[J].Geomatics and Information Science of Wuhan University,2025,50(8):1599-1607.DOI:10.13203/j.whugis20240243
YANG Jiuyuan,WEN Yangmao,XU Caijun.Coseismic Rupture Behavior of the 2024 Nima (Xizang,China) Mw6.0 Earthquake Revealed by InSAR Observations[J].Geomatics and Information Science of Wuhan University,2025,50(8):1599-1607.DOI:10.13203/j.whugis20240243DOI:
Coseismic Rupture Behavior of the 2024 Nima (Xizang,China) Mw6.0 Earthquake Revealed by InSAR Observations
a shallow Mw 6.0 earthquake struck the Nima County in the north-central Tibetan Plateau. As the largest earthquake to occur around the Laxiongcuo-Gaerkong fault(LGF) zone
the occurrence of the 2024 Nima earthquake offers an important chance to further understand the distribution and kinetic characteristic of the seismogenic structures in this little studied region.
Methods
2
In this paper
we use the ascending and descending synthetic aperture radar (SAR) images of the Sentinel-1A satellite to acquire the coseismic surface deformation related to this event and investigate the seismogenic fault structure.
Results and Conclusions
2
Though both the NE-dipping and NW-dipping rupture fault models acquired by interferometric SAR observations can fit the coseismic deformation well
we conclude that this earthquake nucleated a NE-dipping (a strike angle of 325°) right-lateral strike-slip fault with a dip of 83°
which may be a blind branch fault belonging to the LGF
according to the integrated analysis of the inversions
historical earthquakes
regional fault distributions and kinematics. In addition
coseismic Coulomb stress changes reveal that the stress at the shallow part of the western segment of the middle branch fault of the Xiangyanghu-Buruocuo fault can reach 0.11 bar
DENG Qidong , CHENG Shaoping , MA Ji , et al . Seismic Activities and Earthquake Potential in the Tibetan Plateau [J]. Chinese Journal of Geophysics , 2014 , 57 ( 7 ): 2025 - 2042 .
ZHANG Peizhen , SHEN Zhengkang , WANG Min , et al . Kinematics of Present-Day Tectonic Deformation of the Tibetan Plateau and Its Vicinities [J]. Seismology and Geology , 2004 , 26 ( 3 ): 367 - 377 .
TAYLOR M , PELTZER G . Current Slip Rates on Conjugate Strike-Slip Faults in Central Tibet Using Synthetic Aperture Radar Interferometry [J]. Journal of Geophysical Research: Solid Earth , 2006 , 111 ( B12 ): B12402 .
XU X W , TAN X B , YU G H , et al . Normal- and Oblique-Slip of the 2008 Yutian Earthquake: Evidence for Eastward Block Motion, Northern Tibetan Plateau [J]. Tectonophysics , 2013 , 584 : 152 - 165 .
WERNER C , WEGMÜLLER U , STROZZI T , et al . Gamma SAR and Interferometric Processing Software [C]// The ERS-ENVISAT Symposium , Gothenburg, Sweden , 2000 .
GOLDSTEIN R M , WERNER C L . Radar Interferogram Filtering for Geophysical Applications [J]. Geophysical Research Letters , 1998 , 25 ( 21 ): 4035 - 4038 .
GOLDSTEIN R M , ZEBKER H A , WERNER C L . Satellite Radar Interferometry: Two-Dimensional Phase Unwrapping [J]. Radio Science , 1988 , 23 ( 4 ): 713 - 720 .
CAVALIÉ O , DOIN M P , LASSERRE C , et al . Ground Motion Measurement in the Lake Mead Area, Nevada, by Differential Synthetic Aperture Radar Interferometry Time Series Analysis: Probing the Lithosphere Rheological Structure [J]. Journal of Geophysical Research: Solid Earth , 2007 , 112 ( B3 ): B03403 .
LOHMAN R B , SIMONS M . Some Thoughts on the Use of InSAR Data to Constrain Models of Surface Deformation: Noise Structure and Data Downsampling [J]. Geochemistry, Geophysics, Geosystems , 2005 , 6 ( 1 ): Q01007 .
OKADA Y . Surface Deformation Due to Shear and Tensile Faults in a Half-Space [J]. Bulletin of the Seismological Society of America , 1985 , 75 ( 4 ): 1135 - 1154 .
FENG W P , LI Z H , ELLIOTT J R , et al . The 2011 Mw 6.8 Burma Earthquake: Fault Constraints Provided by Multiple SAR Techniques [J]. Geophysical Journal International , 2013 , 195 ( 1 ): 650 - 660 .
ZHANG Qingyun , LI Yongsheng , LUO Yi , et al . Source Parameters for the 2016 Mw 6.2 Italy Amatrice Earthquake Revealed by InSAR Observations [J]. Geomatics and Information Science of Wuhan University , 2019 , 44 ( 1 ): 118 - 124 .
PARSONS B , WRIGHT T , ROWE P , et al . The 1994 Sefidabeh (Eastern Iran) Earthquakes Revisited: New Evidence from Satellite Radar Interferometry and Carbonate Dating About the Growth of an Active Fold Above a Blind Thrust Fault [J]. Geophysical Journal International , 2006 , 164 ( 1 ): 202 - 217 .
YANG Jiuyuan , WEN Yangmao , XU Caijun . Seismogenic Fault Structure of the 2023 Ms 6.2 Jishishan (Gansu,China) Earthquake Revealed by InSAR Observations [J]. Geomatics and Information Science of Wuhan University , 2025 , 50 ( 2 ): 313 - 321 .
SYMITHE S J , CALAIS E , HAASE J S , et al . Coseismic Slip Distribution of the 2010 M 7.0 Haiti Earthquake and Resulting Stress Changes on Regional Faults [J]. Bulletin of the Seismological Society of America , 2013 , 103 ( 4 ): 2326 - 2343 .
WANG Jianjun , XU Caijun , SHEN Wenbin . The Coseismic Coulomb Stress Changes Induced by the 2010 Mw 6.9 Yushu Earthquake, China and Its Implication to Earthquake Hazards [J]. Geomatics and Information Science of Wuhan University , 2012 , 37 ( 10 ): 1207 - 1211 .
XU Caijun , WANG Jianjun , XIONG Wei . Retrospection and Perspective for Earthquake Stress Triggering [J]. Geomatics and Information Science of Wuhan University , 2018 , 43 ( 12 ): 2085 - 2092 .
WANG R J , LORENZO-MARTÍN F , ROTH F . PSGRN/PSCMP — A New Code for Calculating Co- and Post-Seismic Deformation, Geoid and Gravity Changes Based on the Viscoelastic-Gravitational Dislocation Theory [J]. Computers & Geosciences , 2006 , 32 ( 4 ): 527 - 541 .
FREED A M . Earthquake Triggering by Static, Dynamic, and Postseismic Stress Transfer [J]. Annual Review of Earth and Planetary Sciences , 2005 , 33 : 335 - 367 .
ZIV A , RUBIN A M . Static Stress Transfer and Earthquake Triggering: No Lower Threshold in Sight? [J]. Journal of Geophysical Research: Solid Earth , 2000 , 105 ( B6 ): 13631 - 13642 .