尼泊尔Ms8.1地震构造背景及对周边地区地震活动趋势的影响  

The Seismotectonic Setting and Effect on the Neighbouring Seismicity Trend of Ms 8.1 Earthquake on April 25,2015

作　　者：雷东宁[1,2] 蔡永建[1,2,3] 李恒[1,2] 吴建超[1,2] 乔岳强[1,2] 余松[1,2] 廉超[1,2] 

机构地区：[1]中国地震局地震研究所(地震预警湖北省重点实验室),武汉市洪山侧路40号430071 [2]武汉地震工程研究院,武汉市洪山侧路40号430071 [3]中国地质大学(武汉)地球科学学院,武汉市鲁磨路388号430074

出　　处：《大地测量与地球动力学》2015年第5期738-741,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所所长基金(IS200856069)

摘　　要：分析印度板块与欧亚板块俯冲带、尼泊尔Ms8.1地震震中区地震构造及地震发震构造,讨论主震对余震触发及余震的时空强特征和地震对周边地区地震活动趋势的影响。初步分析认为,主边界断裂为本次地震的发震构造,属于低角度逆冲断层地震;余震分布范围与震源破裂面积和方式基本一致,具有向东迁移的时空特征;西藏定日Ms5.9、聂拉木Ms5.3地震不属于尼泊尔地震余震,是应力扰动的结果;沿俯冲带向东至喜马拉雅东构造结是大震发生的危险地段。Based on previous research,we analyze seismogenic structure,the triggering of aftershocks by mainshock,and the subsequent distribution of aftershocks,on the basis of which we discuss the seismicity trends surrounding the Nepal earthquake.The preliminary study suggests that the main boundary fault is responsible for this event,belonging to low-angle thrust faulting.The spatial distribution range of aftershocks is basically consistent with source rupture area and pattern,characterized by a migration eastward in time sequence.Furthermore,both the earthquake events of Nielamu Ms5.3and Dingri Ms5.9may be consequences of the tectonic stress field changes caused by the mainshock,and do not belong to its aftershock.The most seismically dangerous area is in a certain segment between the mainshock and the Himalayan eastern structural syntaxis along the subduction zone of the Indian and Eurasian plates.

关 键 词：尼泊尔Ms8.1地震 地震构造背景 板块俯冲 余震活动 地震活动趋势 

分 类 号：P315[天文地球—地震学]