东昆仑断裂带玛沁段周围小震震源机制解系统聚类分析

英文篇名：SYSTEMATIC CLUSTER ANALYSIS OF FOCAL MECHANISM OF SMALL EARTHQUAKES IN MAQIN REGION OF THE EAST KUNLUN ACTIVE FAULT
中文刊名：高原地震
英文刊名：Plateau Earthquake Research
作者：孙世瑞 ; 姚家骏 ; 杨玉霞
英文作者：SUN Shirui1 ; YAO Jiajun1 ; YANG Yuxia2(1.Earthquake Administration of Qinghai Province ; Xining 810001 ; China ; 2.Earthquake Administration of Menyuan County ; Qinghai Province ; Menyuan 810300 ; China)
中文关键词：东昆仑断裂带 ; 震源机制解 ; 聚类分析
英文关键词：The east Kunlun active fault ; Focal mechanism ; Systematic cluster
出版日期：2012-12-15
机构：青海省地震局;青海省门源县地震局;
年：2012
期：04
出版单位：高原地震

摘要

利用P、S波最大振幅比计算得到东昆仑断裂带玛沁段周围2008年以来57个小地震震源机制解,并进行系统聚类分析。结果表明,该区小震错动方式以走滑型活动为主,平均主压应力P轴方位角为50°,倾角为5°,主张应力T轴方位角为140°,倾角为4°,与该区所受的地球动力学背景基本一致。
By using the maximum amplitude ratio of P and S wave,the focal mechanisms of 57 small earthquakes since 2008 in Maqin region of the east Kunlun active fault were calculated,and the systematic cluster analysis was also carried out.The results indicated that the dislocation mode of small earthquakes was dominated by strike-slip fault activities in the region,the azimuth and the dip of mean principal compressional stress axis was 50°and 5°,the azimuth and the dip of mean principal tensil stress axis was 140°and 4°,which were in consonance with the geodynamic regime of Maqin region.

引文

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