Anomalous crustal movements before great Wenchuan earthquake observed by GPS

查看全文 作　　者：Gu Guohua Meng Guojie Wang [1]Wuxing

机构地区：[1]Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

出　　处：《Geodesy and Geodynamics》索引2011年第2卷第2期,共10页

基　　金：supported by the National 973 Program of China(2008CB425704) 摘　　要：Studies of GPS data carried out before and after the great Wenchuan earthquake of Ms8.0 on May 12,2008 show that anomalous crustal movements occurred before the earthquake.Data from 4 pre-earthquake observation sessions at a dense network of stations show that there were prominent broad-ranged long-and mid-term anomalies in horizontal displacements and strain and in vertical displacements.Data from the fewer-numbered reference stations of continuous GPS observations since 1999 in West and South China showed short-term preseismic anomalies in horizontal displacements.The detection of co-seismic horizontal displacements at these stations supports the existence of the pre-earthquake anomalies.Results of single-epoch solutions of data from continuous-observation stations near the epicenter also show large imminent anomalies in vertical displacements.Although the Wenchuan earthquake was not predicted,these results give a strong indication that GPS should be the main observation technique for long-term,mid-term,short-term and imminent earthquake predictions. 关键词：GPS数据 GPS观测地壳运动地震前异常汶川数据显示水平位移

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Anomalous crustal movements before great Wenchuan earthquake observed by GPS

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