Numerical Modeling of Earthquake Generating Processes in the Japan Subduction Slab
详细信息
- 责任者：Jiang Hui (Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Deng Zhihui
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(7)
- 关键词：大震 ; great earthquakes ; 数值模拟 ; numerical simulation ; 日本 ; Japan
- 页码：p.2303-2312
- 图表：7 illus., 1 table, 26 refs.
- 分类号：0500
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Understanding of earthquake dynamic mechanism is the key of studying the causes of earthquakes,especially the large events.Numerical simulation is a fast and efficient approach to solve this issue.The Mw9.0 earthquake of Miyagi Prefecture,northeastern Japan on 11th March,2011 occurred at the Japan subduction slab.In this article,we take the Japan subduction slab as the study object,and simulate the stick-slip process between the slab and overlying plate as well as the instability processes of the fault by a two-dimensional viscoelastic finite element model.The results show that the underthrusting of the Pacific plate leads to the spontaneous stick-slip processes,characterized by fault locking,fault unlocking and back to fault locking again,which present certain quasi-periodicity in the slab,and big events mainly concentrated in the depth range of 20~30 km.Using different models with varied dip angles of the subduction slab,we make a comparative study of simulations.The results reveal that the geometry of the subduction slab and different depths where the subduction angle changes have different effects on the simulation results.