2022年芦山6.1级地震和马尔康6.0级地震前的重力变化特征  

The Variation Characteristics of Gravity Field before the Lushan M_(s)6.1 Earthquake and Maerkang M_(s)6.0 Earthquake in 2022

作　　者：郑兵[1] 马伶俐[1] 王伟力[1] 温军军 易天阳[1] 刘宏伟 崔靖锋 竹任国 白云波 ZHENG Bing;MA Ling-li;WANG Wei-li;WEN Jun-jun;YI Tian-yang;LIU Hong-wei;CUI Jing-feng;ZHU Ren-guo;BAI Yun-bo(Sichuan Seismological Bureau Crustal Deformation Observation Center,Ya'an 625000,China)

机构地区：[1]四川省地震局地壳形变观测中心,四川雅安625000

出　　处：《地震》2023年第1期42-53,共12页Earthquake

基　　金：2022年四川省地震局科技专项(LY2222)。

摘　　要：地震孕育过程中的地表重力值会发生相应的变化,利用四川地区2018年3月-2022年4月的流动重力观测数据得到重力场等值线变化图,研究2022年芦山6.1级地震和马尔康6.0级地震前的重力变化特征.结果表明:①芦山6.1级地震和马尔康6.0级地震震前约一年半进入重力变化显著时期;②芦山6.1级地震对马尔康6.0级地震的发生有促进作用;③芦山6.1级地震和马尔康6.0级地震前震区重力变化等值线出现类似于四象限区域的分布特征,显示该处应力高度集中;④芦山6.1级地震和马尔康6.0级地震震中区处于零值线附近且零值线在此处转折弧度较大,是构造带易发震的薄弱位置.The gravity value of the Earth's surface will change accordingly in the process of earthquake preparation.We draw the contour maps of gravity field by using the mobile gravity observation data in Sichuan area from March 2018 to April 2022,and study the variation characteristics of the gravity field before Lushan Ms6.1 earthquake and Maerkang M_(s)6.0 earthquake in 2022 by the contour maps.The results show:①It was a period of intensive changes in gravity that about one and a half years before the Lushan Ms6.1 earthquake and Maerkang M_(s)6.O earthquake.②The Lushan M_(s)6.1 earthquake accelerated the occurrence of the Maerkang M_(s)6.O earthquake;③The four quadrant area of the gravity variation contour before Lushan Ms6.1 earthquake and Maerkang M_(s)6.O earthquake indicated a high concentration of stress in the area;④The epicenters of the Lushan Ms6.1 earthquake and Maerkang M_(s)6.O earthquake were near the zero value line that had a larger turning radian,which were weak positions of the tectonic belts prone to earthquakes.

关 键 词：重力场等值线变化图 重力变化特征 四象限 转折弧度较大 薄弱位置 

分 类 号：P315.7[天文地球—地震学]