Preliminary Investigation on Surface Rupture and Coseismic Displacement of the January 7,2025 Dingri Earthquake in Xizang
Shao Yanxiu
Wang Aisheng
Liu-Zeng Jing
Wang Wenxin
Han Longfei
Xing Linjie
Xu Jianhong
Wang Jichuan
Yao Wenqian
Zhang Huixin
Liu Xiaoli
Abstract：On January 7,2025,a MS6.8 earthquake struck Dingri County in the Shigatse region of Xizang.In response to the event,it conducted field investigations and high-precision UAV aerial surveys,which indicate that the rupture extends from the central-northern segment of the Dengme Co(or Dingmu Co)fault to the eastern shore of Yangmudingcuomu Lake and the northern bank of the Pengqu River,totaling approximately 36.5 km.The surface rupture predominantly follows existing fault structures,with the southern end exhibiting multiple parallel faults and surface scarps up to 4 km wide.The rupture patterns are complex,combining seismic scarps and extensional fissures of varying dimensions.Notably,the northern section displays larger scarps,with maximum displacements reaching approximately(265±27)cm.Scarp heights vary significantly along the rupture,with minimal vertical displacement at north and south end.Our preliminary findings suggest that the surface rupture length and maximum displacement align closely with global empirical relationships between earthquake magnitude and rupture characteristics.Additionally,the characteristics of the Dingri earthquake's surface rupture offer valuable insights for studying the geomorphic evolution of single-event seismic scarps and their long-term cumulative effects.
Keywords：earthquakesDengme Co faultseismic surface rupturecoseismic displacementrupture lengthtectonics
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：19( 1677-1695 )