2020年1月19日新疆伽师MS6.4地震前重力场变化特征研究  

STUDY ON VARIATION CHARACTERISTICS OF THE GRAVITY FIELD BEFORE XINJIANG JIASHI M S6.4 EARTHQUAKE ON JANUARY 19TH,2020

作　　者：李瑞[1,2] 杨磊 赵磊 丁宇 孙小旭 陈丽[1] LI Rui;YANG Lei;ZHAO Lei;DING Yu;SUN Xiao-xu;CHEN Li(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China;Institute of Seismology,China Earthquake Administration,Wuhan 430071,Hubei,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]中国地震局地震研究所,湖北武汉430071

出　　处：《内陆地震》2020年第1期95-102,共8页Inland Earthquake

基　　金：新疆地震科学基金(201912);国家自然科学基金(41874015);地震科技星火计划(XH18054,XH20069Y);新疆天山青年计划(2017Q010、2017Q064);新疆维吾尔自治区区域协同创新专项(上海合作组织科技伙伴计划)(2017E01030);中科院战略性先导科技专项(XDB18020201).

摘　　要：针对新疆伽师M S6.4地震,利用多期重复流动重力观测数据并结合地震地质资料分析和研究此次地震前重力异常变化特征。研究结果表明:此次地震发生在最新观测的半年尺度零值线附近,两年累计变化量达到-100×10-8 m·s-2,2018年4月观测的半年尺度重力场变化形成了以巴楚—阿图什为长半轴的椭圆形重力异常低值异常区,长半轴与柯坪断裂带走向一致。In view of the Jiashi M S6.4 earthquake in Xinjiang,the gravity anomaly change characteristics before the earthquake were analyzed and studied by using multi-stage repeated flow gravity observation data and combining with seismic geological data.The results show that the earthquake occurred near the latest observed half year scale zero value line,and the cumulative change amount in two years reached-100×10-8 m·s-2.The half year scale gravity field change observed in April 2018 formed an elliptical gravity anomaly low value area with Bachu Atush as the long half axis,and the long half axis is consistent with the trend of Keping fault zone.

关 键 词：伽师MS6.4地震 流动重力 前兆异常 零值线 

分 类 号：P315.7[天文地球—地震学]