An Analysis of the Deformation of the Crust and LAB beneath the Lushan and Wenchuan Earthquakes in Sichuan Province
详细信息
- 责任者：Shen Xuzhang (Lanzhou Institute of Seismology ; China Earthquake Administration ; Lanzhou 730000 ; China)
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(6)
- 关键词：震源 ; focus ; 岩石圈 ; lithosphere ; 四川 ; Sichuan Province
- 页码：p.1895-1903
- 图表：7 illus., 33 refs.
- 分类号：0500
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Study of the crustal and lithospheric deformation is important to understanding of the deep environment of moderate and major earthquakes. In this work, the P and S receiver functions from the Sichuan seismic network are jointly used to study the crustal and lithospheric structures beneath the Lushan 7.0 earthquake on 20 April 2013 and Wenchuan 8.0 earthquake on 12 May 2008. The results indicate that there is strong deformation of the Moho and LAB (lithosphere-asthenosphere boundary) beneath the transition region from the Tibetan plateau to the Sichuan basin. The offset and downward warping of the Moho are observed beneath the Lushan and Wenchuan earthquakes with the sinking LAB. Such intense deformation may imply the accumulation of high stresses, which is probably the important geodynamic context of the Lushan and Wenchuan earthquakes.
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