Characteristics of satellite-gravity variations in the North-South Seismic Belt before the 2013 Lushan earthquake  

作　　者：Zou Zhengbo Li Hui Kang Kaixuan Wu Yunlong 

机构地区：[1]Key Laboratory of Earthquake Geodesy,China Earthquake Administration [2]Wuhan Base of Institute of Crustal Dynamics,China Earthquake Administration [3]School of Geodesy and Geomatics,Wuhan University

出　　处：《Geodesy and Geodynamics》2013年第3期1-6,共6页大地测量与地球动力学（英文版）

基　　金：supported by the China Earthquake Administration Special Basic Scientific Research Business Expenses(IS201116022);the National Natural Science Foundation of China(40704009,41004030)

摘　　要：To study the characteristics of gravity variations in and near the North-South Seismic Belt before the 2013 Lushan earthquake,we used the geopotential-field models based on monthly data of the RI.~5 GRACE satellite to calculate the gravity changes. Here we present the patterns of annually cumulative variation, differentiatial variation and secular trend, as well as the continuous time-series at 4 characteristic sites during 2004 -2012. The result shows that the anomalous positive-to-negative transition zone, in which the epicenter of the 2008 Wenchuan earthquake was located, did not show any new gravity change before the Lushan earthquake, though located in the same zone.To study the characteristics of gravity variations in and near the North-South Seismic Belt before the 2013 Lushan earthquake,we used the geopotential-field models based on monthly data of the RI.~5 GRACE satellite to calculate the gravity changes. Here we present the patterns of annually cumulative variation, differentiatial variation and secular trend, as well as the continuous time-series at 4 characteristic sites during 2004 -2012. The result shows that the anomalous positive-to-negative transition zone, in which the epicenter of the 2008 Wenchuan earthquake was located, did not show any new gravity change before the Lushan earthquake, though located in the same zone.

关 键 词：satellite gravity gravity variation EARTHQUAKE time series North-South Seismic Belt 

分 类 号：P312.1[天文地球—固体地球物理学]