中国科学院大学学报2024，Vol.41Issue(1)：70-80,11.DOI:10.7523/j.ucas.2022.046
2021年5月22日青海玛多Ms7.4地震同震变形的数值模拟及其动力学启示
Coseismic deformation of Maduo Ms7.4 earthquake in Qinghai,on May 22,2021:numerical simulation analysis and geodynamic enlightenment
摘要
Abstract
The Maduo Ms7.4 earthquake in Qinghai on May 22,2021 is the only strong earthquake that occurred in Bayan Har block in recent years.The coseismic deformation and stress adjustment of the Maduo earthquake have been highly concerned by many scholars.In this paper,a three-dimensional parallel elastic finite element program for coseismic deformation simulation of large earthquakes is developed using split node technique.The correctness and effectiveness of the program were verified by comparing with the analytical solutions of the elastic seismic dislocation models.We calculated the coseismic deformation of the Maduo Ms7.4 earthquake and the coseismic Coulomb stress changes on the major faults in the research area.The results show that the surface coseismic deformation is consistent with those by different geodetic observation data and inversion results of some finite fault models.It also shows the earthquake is mainly a sinistral strike-slip fault with some normal fault components.Most aftershocks(magnitude＞1.0 and depth of 9-11 km)except those besides the mainshock fault located in the regions of positive Coulomb stress changes at the depth of 10 km.The distribution of the Coulomb stress changes on the different fault zones is not uniform.The Coulomb stress changes on the southern end of Elashan Fault zone,the eastern end of Kunzhong Fault zone,most segments except some central-western parts of East Kunlun Fault zone,the northwestern segment of Dari Fault zone and the northwest and southeast segments and regions near the mainshock of Maduo-Gande Fault zone increase obviously,which requires more attention.关键词
玛多地震/同震变形/有限元/库仑应力变化/地震危险性Key words
Maduo earthquake/coseismic deformation/finite element model/Coulomb stress change/seismic hazard分类
天文与地球科学引用本文复制引用
孟思晨,孟秋,陈启志,胡才博..2021年5月22日青海玛多Ms7.4地震同震变形的数值模拟及其动力学启示[J].中国科学院大学学报,2024,41(1):70-80,11.基金项目
国家自然科学基金(42074117)和中央高校基本科研业务费专项资金(E1E40413X2)资助 （42074117）
