Abstract：Based on the historical seismicity of the southeast segment of the Xianshuihe fault zone and distribution of the earthquakes around the 2022 Luding MS6.8 earthquake in the past decade, using GNSS observation data, we give the velocity and strain rate field in the regional and surrounding areas, and identify the deformation characteristics before the earthquake. The GNSS velocity field shows that the strike slip rate of the southeast section of the Xianshuihe fault zone is about 10 mm/a, and the regional movement is in the ES direction, the same results with the regional structure. The strain rate field show that there is still a strong shear strain rate in the seismogenic fault. With the continuous release of strain energy after the Wenchuan earthquake, the unloading effect of the Longmenshan fault zone indirectly affects the southeast section of the Xianshuihe fault zone. The fault has been in a transition zone with high strain accumulation for a long time, the degree of fault blocking increased today. The trend of seismic activity and seismic risk in this area deserve further attention and research.
SHEN Xing,LIANG Hongbao,SONG Chengke. Deformation Characteristics before the Luding MS6.8 Earthquake and Seismicity of the Southeast Section of the Xianshuihe Fault[J]. jgg, 2024, 44(1): 69-74.
