2014年康定M_S6.3级地震前后的重力变化特征  

The Variation Characteristics of Gravity Field before and after the 2014 Kangding M_S6.3 Earthquake

作　　者：郑兵[1] 杨洋[1] 马伶俐[1] 易天阳[1] 李菲菲[1] 廖明辉[1] 温军军 王伟力[1] 高丽君 ZHENG Bing;YANG Yang;MA Lingli;YI Tianyang;LI Feifei;LIAO Minghui;WEN Junjun;WANG Weili;GAO Lijun(Surveying Engineering Institute,Sichuan Earthquake Agency, Sichuan Yaan 62500,China)

机构地区：[1]四川省地震局测绘工程院

出　　处：《四川地震》2019年第3期18-23,共6页Earthquake Research in Sichuan

基　　金：“川滇地区三维密度结构模型和强震孕育构造环境研究”(2016CESE0202);中国地震科技星火计划“川滇地壳形变特征及在强震中短期预测中的应用研究(XH15037SX)”共同资助

摘　　要：利用四川地区2010年8月至2015年3月的流动重力观测数据作出重力场等值线变化图像,研究分析2014年康定MS6.3级地震前后的重力变化特征,结果表明:(1)三岔口地区长期保持区域性重力正值变化异常及重力变化高梯度带;(2)在康定MS6.3级地震前后三岔口地区的区域性重力正值变化异常及重力变化高梯度带变化并不是特别显著;(3)在康定MS6.3级地震前震区重力变化等值线出现四象限区域或者类似于四象限区域的分布特征;(4)康定MS6.3级地震发震位置处于0值线附近且0值线在此处发生明显的转折、畸变;(5)康定MS6.3级地震发生在重力减小后回调增加的过程中,震后重力继续回调增加。On the basis of gravity observation data from August 2010 to March 2015 in the Sichuan area,we draw contour variation pictures of gravity field.The pictures have to study the variation characteristics of the gravity field before and after Kangding MS6.3 earthquake.The result shows :(1) Positive change anomaly of the regional gravity field and high gradient zone of gravity variation are have kept at long-term in the intersection of Xianshuihe fault,Longmenshan fault and Anninghe-Zemuhe faults;(2) Positive change anomaly of the regional gravity field and high gradient zone of gravity variation’s changes weren’t particularly evident before and after Kangding MS6.3 earthquake in the intersection of Xianshuihe fault,Longmenshan fault and Anninghe-Zemuhe faults;(3) The gravity variation contour was shown as the distribution characteristic of the four quadrant area or similar to the four quadrant area before Kangding MS6.3 earthquake in the earthquake area;(4) The location of the Kangding MS6.3 earthquake was in the vicinity of the 0 value line and the 0 value line turned obviously and distorted;(5) The Kangding MS6.3 earthquake occurred in the course of the increase in the reduction of gravity after the callback and the gravity continued to increase after the earthquake.

关 键 词：流动重力观测数据 康定MS6.3级地震 重力变化特征 

分 类 号：P315.726[天文地球—地震学]