School of Earth System Science, Tianjin University, Tianjin 300072, China
The Second Monitoring and Application Center, China Earthquake Administration, Xi'an 710054, China
Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
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.
沈阳化工大学材料科学与工程学院 沈阳 110142
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