地震地磁观测与研究2017，Vol.38Issue(2)：12-16,5.DOI:10.3969/j.issn.1003-3246.2017.02.003
2013年甘肃岷县—漳县M 6.6地震序列精定位研究
Precise relocation of Minxian-Zhangxian M 6.6 earthquake sequence in Gansu Province, 2013
摘要
Abstract
Applying the double-difference algorithm to the Minxian-Zhangxian,mainshock (M 6.6) and its 388 aftershocks after 48 hours,Gansu on July 22 2013,we obtained 350 relocated earthquakes.Our results show that the aftershocks are shown as a shovel-shaped structure with a large northeastward dip extending for over 12 km long along the north-west direction and have an approximately symmetrical distribution about a center of the mainshock.The aftershocks are focused at depths of 4-10 km,but they migrate from about 10 km depth to above 3 km depth and their magnitudes range from 3-4 in a deeper layer to 2-3 in a shallower layer.The aftershocks show clearly a double-layer structure,one of which is at 4-10 km depth,while the other is above 3 km depth.There are few events between these two layers.The shallow earthquake layer could be one of causes that made a strong damage in the event.The vertical cross section of aftershock hypocenters shows a northeast tilt of the fault plane,suggesting that the seismogenic fault of this mainshock could be the Lintan-Diachang fault.关键词
岷县—漳县主震/余震/双层结构/高倾角/双差定位Key words
Minxian-Zhangxian earthquake/aftershocks/double-layer structure/large dip/double-difference algorithm引用本文复制引用
梁姗姗,徐志国,杜广宝,刘敬光,张广伟..2013年甘肃岷县—漳县M 6.6地震序列精定位研究[J].地震地磁观测与研究,2017,38(2):12-16,5.基金项目
中国地震局地震科技星火计划(项目编号:XH17049Y) （项目编号:XH17049Y）
