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Title:: Comparative Analysis of the Coseismic Gravity Gradient Signals of the 2007 Bengkulu,Indonesia M_W8.4 Earthquake Based on GRACE Satellite Data and the Dislocation Model

作者:: 李静¹; 万晓云¹; 徐铭¹; 2; (1.中国地质大学(北京)土地科学技术学院,北京 100083; 2.广州海洋地质调查局天然气水合物勘查开发国家工程研究中心,广东广州 511466)

Author(s):: LI Jing¹; WAN Xiaoyun¹; XU Ming¹; 2; (1.School of Land Science and Technology,China University of Geosciences(Beijing),Beijing 100083,China)(2.National Engineering Research Center for Gas Hydrate Exploration and Development,Guangzhou Marine Geological Survey,Guangzhou 511466,Guangdong,China)

Keywords:: GRACE; the dislocation model; gravity gradient; the Bengkulu; Indonesia M_W8.4 earthquake

摘要:: 为评估基于GRACE重力卫星提供的时变重力场数据计算地震同震重力变化梯度的可行性,利用GRACE卫星数据计算得到2007年印尼明古鲁M_W8.4地震前后12个月的重力梯度变化值,使用黏弹性半空间层状位错模型正演计算得到同震重力梯度变化的理论值,并与GRACE重力卫星数据处理结果进行对比分析。结果表明:GRACE重力卫星数据处理结果与位错模型正演结果量级一致,但具体数值有差异; 相关性分析表明随着距震中越近,两种方法得到的梯度变量相关性越高,在震中区域的相关性可高达90%以上。

Abstract:: To assess the feasibility of the time-variable gravity field data provided by GRACE satellite in detection of the coseismic gravity gradient changes,the gravity gradient changes in 12 months before and after the 2007 Bengkulu,Indonesia M_W8.4 earthquake in the epicenter and its vicinity are calculated by GRACE satellite data.The theoretical values of coseismic gravity gradient changes are calculated by the forward of the dislocation model,and then compared with the GRACE results.At the level of the order of magnitude,the GRACE results are consistent with the results from the forward of the dislocation model,though the specific values are a little different.Correlation analysis shows that the closer to the epicenter,the higher the correlation of the gradient values obtained by the two methods are,and the correlation in the epicentral area are over 90%.