• 责任者：Wang Lianjie (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Wang Hongcai
• 刊名：Acta Geoscientica Sinica
• 出版年：2013
• 卷期：34(6)
• 关键词：大震 ; great earthquakes ; 位移 ; displacements ; 构造应力场 ; tectonic stress field ; 日本 ; Japan
• 页码：p.665-670
• 图表：11 illus., 24 refs.
• 分类号：0300
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

     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.