地球学报Issue(6)：665-670,6.DOI:10.3975/cagsb.2013.06.03
日本MW9.0级地震同震位移场和应力场的有限元模拟
Modeling of the Co-seismic Displacement Field and Stress Field of Mw9.0 Earthquake in Japan by Finite Element Method
摘要
Abstract
According to the GPS data, the fault-slip model for MW9.0 earthquake in March 2011 was inversed by using the finite element method. On the basis of the inversion, co-seismic displacement and stress fields were calculated, and the distribution of displacement and stress was given. The results show that fault-slip was up to 25 m. Northeast Japan was moved eastward by 1~6 meters, and the maximum displacement in the epicentral area was up to 24.25 m. After the earthquake, the surface was uplifted by about 5.6 meters near the epicenter. There was a depression area of 0.8 meters in the east coast of Northeast Japan. The calculated co-seismic surface displacement is consistent with GPS measurements. Stress was changed by the earthquake, resulting in the decrease of the post-earthquake stress. Stress change was about 9.9 MPa near the epicenter, 32 MPa in the depths, and less than 4.4 MPa in Northeast Japan. Earthquake-induced stress changes were mainly horizontal stress, whereas vertical stress changes were very small.关键词
日本地震/断层滑移/地应力场/同震位移/有限元模拟Key words
earthquake in Japan/fault slid/stress field/co-seismic displacement/finite element modeling分类
天文与地球科学引用本文复制引用
王连捷,王红才,王薇,孙东生,崔军文,乔子江,赵卫华,郭彬彬..日本MW9.0级地震同震位移场和应力场的有限元模拟[J].地球学报,2013,(6):665-670,6.基金项目
本文由国土资源部“深部探测技术与试验研究”专项(编号:SinoProbe-07)和国家科技支撑“汶川地震断裂带科学钻探井中探测”项目(编号:2008wfsd-03)联合资助。 （编号:SinoProbe-07）
