| 日本MW9.0级地震同震位移场和应力场的有限元模拟 |
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| 关键词:earthquake in Japan fault slid stress field co-seismic displacement finite element modeling |
| 基金项目:国土资源部“深部探测技术与试验研究”专项(编号: SinoProbe-07); 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) |
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| Modeling of the Co-seismic Displacement Field and Stress Field of Mw9.0 Earthquake in Japan by Finite Element Method |
| 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. |
| WANG Lian-jie,WANG Hong-cai,WANG Wei,SUN Dong-sheng,CUI Jun-wen,QIAO Zi-jiang,ZHAO Wei-Hua,GUO Bin-bin.2013.Modeling of the Co-seismic Displacement Field and Stress Field of Mw9.0 Earthquake in Japan by Finite Element Method[J].Acta Geoscientica Sinica,34(6):665-670. |
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