大柴旦Ms6.3级地震序列精确定位及发震构造初步研究  

ACCURATE LOCATION OF DACHAIDAN Ms6.3 EARTHQUAKE SEQUENCE AND EARTHQUAKE TECTONIC USING THE DOUBLE-DIFFERENCE EARTHQUAKE LOCATION METHOD

作　　者：刘薇[1] 张晓清[1] 胡玉[1] 

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《高原地震》2012年第4期20-24,35,共6页Plateau Earthquake Research

基　　金：青海省地震局地震科学基金资助项目(2009B05)

摘　　要：利用双差地震定位法对2009年8月28日青海省大柴旦地区发生的Ms6.3级地震及余震序列进行重新定位。结果显示:余震序列主要沿宗务隆山南缘断裂带分布;余震序列优势分布方向为北东东。该序列与宗务隆山南缘断裂带走向一致,与震源区的区域构造基本一致,余震主要分布于主震的南侧。此次地震主震发生在宗务隆山南缘断裂带北侧,Ms6.3级地震主破裂面走向、倾向、倾角与该断裂带产状基本一致,主震破裂面南侧余震活动强于北侧。Using the dual-difference earthquake location method, the aftershock sequence of the Ms6. 3 Dachaidan earthquake occurred on August 28, 2009 in Qinghai province is relocated in this paper. The results showed that the aftershock sequence mainly distributed along the southern margin of Zongwulongshan, and the distribution in long axis direction of aftershock distribution is corresponded to the direction of the Zongwulong- shan fault strike （ in the direction of NEE）. It is mainly along the regional tectonic setting. The aftershocks distributed in the south side of the main shock. The earthquake occurred on the north side of the Zongwulong- shan fault, and its main rupture surface of the Ms6. rence. The aftershocks distributed in south side are 3 earthquake coincide with the parameters of fault occur- greater than in north side of Zongwulongshan fault.

关 键 词：大柴旦地震 余震序列 双差地震定位方法 

分 类 号：P315.2[天文地球—地震学]