南北地震带近期地壳水平运动变化分析

Analysis on Recent Crustal Horizontal Movement Variation of South-North Seismic Belt

对2009、2011及2013年3期陆态网络流动GPS观测资料进行了处理,获得了2009~2011及2011~2013年两个时间段南北地震带地壳水平运动速度图像。参考1999~2007年网络工程流动GPS速度场结果,分析了南北地震带近期地壳水平运动场与应变场变化特征,认为近期地壳运动变化受汶川地震震后影响较大。2013年芦山7.0级地震和岷县漳县6.6级地震是2008年汶川8.0级地震震后应力场调整触发的结果。

We derived the crustal horizontal velocity field at North-South Seismic Belt in two periods of 2009 - 2011 and 2011 -2013 by processing the GPS observation data from TEONC （China Tectonic Environment Observation Network） in 2009, 2011 and 2013. Contrast with the GPS velocity field during 1999 and 2007 from CMONC （China Crustal Movement Observation Network）, we analyzed the recent variations characteristic of crust horizontal velocity field and strain field at the north-south seismic belt and considered that the recent variation of crust movement was mainly influenced by post-seismic effect of Wenchuan Ms8.0 earthquake. The Lushan Ms7.0 earthquake and Minxian-Zhangxian Ms6.6 earthquake were the trigging resuR of post-seismic stress field adjustment of Wen-chuan Ms8.0 earthquake.