地震学报Issue(2)：205-217,13.DOI:10.11939/jass.2015.02.001
利用余震震中分析芦山 MS7．0地震发震构造
Analysis on the seismogenic fault of Lushan MS7.0 earthquake by using epicenters of its aftershocks
摘要
Abstract
The absolute earthquake location method (Hypo71 )was used to locate micro-and small-aftershocks of 2013 MS 7.0 Lushan earthquake,which were recorded by 29 stations around the mainshock region for more than one year.Finally we got the epicentral location of about 1 960 aftershocks.Results reveal that aftershocks laterally distribute along Shuangshi-Dachuan branch fault and its surrounding area,and vertically concentrate on two intersecting af-tershock belts in depth range of ~5—20 km.One aftershock belt dips towards NW,and its dip angle becomes steeper at depth about 12 km.This belt’s extrapolation coincides with the buried fault between Shuangshi-Dachuan branch fault and Xinkaidian fault at surface.The other aftershock belt dips towards SE.Its extrapolation is close to Shuangshi--Dachuan fault at surface;however, its dipping direction is opposite to that of Shuangshi--Dachuan fault.The hypo-center of the Lushan main shock locates close to intersect of the two aftershock belts.Two nodal planes of focal mechanism of the main shock correspond well to the geometry of the two aftershock belts,respectively.This seismogenic structural feature implies that Lushan earthquake probably is resulted from sim-ultaneous movement of two faults along the two aftershock belts.关键词
龙门山断裂带/微地震/地震定位/震源Key words
Longmenshan fault zone/micro-earthquake/earthquake location/hypocenter分类
天文与地球科学引用本文复制引用
赵荣涛,安美建,冯梅,张士安,张纪中,侯春堂..利用余震震中分析芦山 MS7．0地震发震构造[J].地震学报,2015,(2):205-217,13.基金项目
国家自然科学基金（41174039）资助． （）
