文安5.1级地震前后地壳形变特征研究  

Study of Crustal Deformation before and after the Wenan M5.1 Earthquake

作　　者：余丹[1] 魏星[1] 纪寿文[1] 

机构地区：[1]中国地震台网中心,北京100045

出　　处：《华北地震科学》2014年第2期62-67,72,共7页North China Earthquake Sciences

基　　金：中国地震局行业专项"GNSS观测数据共享与服务"(项目编号:14404013224)

摘　　要：应用文安地震200km范围内的定点形变观测资料,在研究断层活动性质的基础上,进一步综合分析在文安地震前后地壳形变的时空演化特征及其与地震活动的关系,结果表明:(1)部分测项在震前均出现张性或者压性转折变化,或者阶跃变化;(2)地表潮汐平面应变状态在中强地震前后表现出不同的变化特征;(3)平面应变参数曲线2011年前后发生同步转折变化,且变化幅度很大,但首都圈及附近地区并没有中强以上地震发生,可能与引发2011年3月日本9.0级特大地震的板块构造应力场变化有关。Based on fixed deformation data within 200 km away from the epicenter of the Wenan earthquake, combined with the fault activity, this paper analyzes the temporal evolution of crustal deformation of the Capital Region and its relationship with seismic activity before and after the Wenan MS. 1 earthquake. The result indicates that： （1） part of the observation items show extensional or compressive changes before the earthquake. （2） The tide plane strain state in earth＇s surface has different characteristics before and after the moderate strong earthquakes. （3） Plane strain parameter curve shows significant synehronal transition around 2011, but, there is no moderate strong earthquakes occurred in the capital region and its joint area, so the synchronal transition may be related to the tectonic stress field changing caused by the Japan 9.0 great earthquake on Mar. 2011.

关 键 词：地震前兆 断层活动 地壳形变观测 

分 类 号：P315.725[天文地球—地震学]