西昌流动地震台阵微震观测  

Micro-seismic observation by Xichang Temporary Seismic Array

作　　者：王松[1] 张振勋[1] 房立华[2] 

机构地区：[1]四川省地震局西昌地震中心站,四川西昌615022 [2]中国地震局地球物理研究所,北京100081

出　　处：《四川地震》2015年第3期5-8,共4页Earthquake Research in Sichuan

摘　　要：安宁河—则木河断裂带是川滇活动地块的东边界,该区域近年来一直被划定为地震重点监视区。为了加强这一区域的微震监测,研究断层深部的变形特征,自2013年1月以来,沿安宁河、则木河和大凉山断裂带布设了32个流动地震观测点。初步监测结果显示,西昌流动地震台阵的监测能力明显高于区域地震台网,可对观测区内ML0.8级以上的微震进行有效监测。西昌地震台阵的建立明显提高了安宁河、则木河和大凉山断裂带的地震监测能力,使监测能力由ML2.0提高至ML0.8。初步监测结果显示,地震主要沿安宁河—则木河断裂和大凉山断裂分布,石棉附近的地震活动水平明显高于其他地区,安宁河断裂在石棉附近的震源深度存在明显差异,东侧较深,西侧较浅。The Anninghe-Zemuhe fault is the eastern boundary of Sichuan-Yunnan block. This region has been clas-sified as seismic risk zone in recent years. In order to strengthen earthquake monitoring in this area and study the deformation characteristics of deep faults,we deployed 32 temporary seismic stations along the Anninghe fault,the Zemuhe fault and Daliangshan fault since January 2013 . Preliminary results show that the monitoring capability of the Xichang seismic array is much higher than the regional seismic network. The array can monitor earthquakes with magnitude larger than ML0. 8 effectively. The earthquakes occur mainly along the Anninghe,Zemuhe and Daliangs-han faults. The seismic intensity of Shimian County is higher than other areas. The seismic source depth of the east-ern block is deeper than that of the western block.

关 键 词：西昌台阵 安宁河-则木河断裂 微震活动 

分 类 号：P315.4[天文地球—地震学]