Spatial Distribution of Regional Horizontal Deformations before and after the Yushu and Wenchuan Earthquakes

详细信息   

• 责任者：Yang Guohua (First Crust Monitoring and Application Center ; CEA ; Tianjin 300180 ; China) ; Yang Bo
• 刊名：Earthquake
• 出版年：2012
• 卷期：32(2)
• 关键词：地形变 ; ground deformation ; 大震 ; great earthquakes ; 青海 ; Qinghai Province ; 四川 ; Sichuan Province
• 页码：p.40-51
• 图表：6 illus., 18 refs.
• 分类号：0500
• issnNo：ISSN1000-3274
• isbnNo：CN11-1893/P

摘要

///Based on GNSS observation （from 1999 to 2007, and from 2009 to 2010） and continuous variation of deformation field, this study employed filtering and analysis of multi-kernel function and an unbiased algorithm of strain field to obtain movement and deformation field of the southeastern of Qinghai-Tibetan Plateau before and after the M_S7.1 Yushu and M_S8.0 Wenchuan earthquakes. The observations showed：1) tectonic activities of seismic source were significantly weakened at spatial and relative long time level before the Yushu and Wenchuan earthquake; 2) spin shear deformation corresponding to the earthquake rupture was neither in nor far from the seismic source region, and there seemed an orderly coordinated action; 3) the trange of large co-seismic horizontal deformation of the Yushu earthquake was actually small; and 4) the North and the surrounding of Litang-Dewu fault zone should be given more attentions.