灯塔M5.1地震震前重力变化特征研究  

Study on the Characteristics of Gravity Change before M5.1 Dengta Earthquake

作　　者：李玉森[1] 焦明若[1] 韩绍欣[1] 底欣欣[1] 索锐[1] 曾冠男 LI Yusen;JIAO Mingruo;HAN Shaoxin;DI Xinxin;SUO Rui;ZENG Guannan(Liaoning Earthquake Agency,44 North-Huanghe Street,Shenyang 110034,China)

机构地区：[1]辽宁省地震局

出　　处：《大地测量与地球动力学》2020年第2期159-164,共6页Journal of Geodesy and Geodynamics

基　　金：中央级公益性科研院所基本科研业务费专项(ZDJ2019-16);辽宁省科技厅社会公关及产业化项目(2017231014)~~

摘　　要：利用辽中南地区2011~2013年流动重力观测资料,深入分析研究2013年灯塔M5.1地震震前的重力空间演化特征及变化机理,结果表明:1)辽中南地区重力场异常变化与灯塔M5.1地震在时空上具有很好的对应性;2)震前1 a重力场四象限特征明显,震前0.5 a出现50μGal的正负反向变化,并伴有重力变化高梯度带,重力点值时序上升和下降趋势明显,重力剖面呈剧烈的上升-下降波动变化;3)结合2011~2012年重力变化背景场和区域地质构造分析认为,灯塔地震可能是由辽中南地区地壳深部物质迁移和地壳构造运动共同作用引起。Based on flow gravity observation data from 2011 to 2013 in southern Liaoning province,in-depth analysis is carried out on the evolution characteristics and the mechanism of gravity space before the M5.1 Dengta earthquake in 2013.The study shows that:1)There is a good correspondence in time and space between the anomaly of the gravity field and the M5.1 Dengta earthquake in middle south Liaoning province.2)One year before the earthquake,the characteristics of the four quadrants are apparent,half a year before the earthquake,50μGal reverse change appeared,accompanied by high gradient zone of gravity change;the rising and falling trend of the gravity point value sequence are obvious,and the gravity profile fluctuates intensely.3)Combining the background field of gravity change and the regional geological structure in 2011 to 2012,we infer that this earthquake may be a result of the density variation of the deep material and tectonic movement in the southern region of Liaoning.

关 键 词：重力测量 灯塔M5.1地震 重力场 空间变化 

分 类 号：P315[天文地球—地震学] P312[天文地球—固体地球物理学]