2014年11月四川康定Ms6.3地震余震联合震源定位研究  

Preliminary study of joint hypocentral determination associated with 2014 November Ms6.3 Sichuang Kangding earthquake

作　　者：申学林[1] 何晓萍[2] 赵素涛[3] 

机构地区：[1]中国地震局地震研究所地震与大地测量重点实验室,武汉430071 [2]浙江大学地球科学学院,杭州310058 [3]中国地质大学(武汉)地球物理与空间信息学院,武汉430074

出　　处：《中国科技论文》2017年第5期574-580,共7页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20120145120003);国家自然科学基金资助项目(41204060);中国地震局地震研究所所长基金资助项目(IS201526232)

摘　　要：为了研究四川康定Ms6.3地震的发震机理,利用距震中150km范围内近台站震相数据和水平分层速度模型,通过联合震源定位法(joint hypocentral determination,JHD)对康定Ms6.3地震震后13d内的687次余震重定位,给出568次余震定位结果。结果显示:余震序列表现出明显时空分布,主要沿鲜水河断裂带中段色拉哈段裂和折多塘断裂北西向分布,展布长度约76km;余震震源深度多展布于地下4~11km范围内,结合相关速度结构,推测康定地震主要错断了上地壳高速层;康定主震发生后的Ms5.8强余震引发了大量余震,余震由色拉哈断裂向折多塘断裂迁移,且分布在色拉哈段裂,与折多塘断裂余震序列有一定距离,推测两断裂之间或许发育有其他小断裂。In order to study the mechanism of the Ms6. 3 Sichuan Kangding earthquake. Based on the data of seismic phase of vic-inity stations within 150 km and horizontal layered velocity model, 687 aftershocks in 13 days of the Kangding Ms6. 3 earthquake were relocated through the method of joint hypocentral determination （JHD） and 568 aftershocks were given The results show that the aftershock sequence displays a distinct temporal and spatial distribution, extension direction is North-West, and the length of distribution is about 76 km. The focal depth are mostly distributed within 4^11 km. Combining with the related veloci-ty structure, all results show that Kangding earthquake may mainly cut the high velocity layer of the upper crust. After the Kangding main shock, Ms5. 8 strong aftershock caused a large number of aftershocks, which transferred from the Selaha fault to the Zheduotang fault, while aftershock sequence of the Selaha fault has a certain distance from that of the Zheduotang fault, it im-plies that other small fractures may be developed between these two fractures.

关 键 词：固体地球物理 地震重定位 康定地震 联合震源定位法 余震分布 

分 类 号：P315[天文地球—地震学]