孙文科2,,
1. 中国地震局地震预测研究所, 北京 100036
2. 中国科学院大学地球与行星科学学院, 北京 100049
基金项目: 国家自然科学基金(41974093,41774088,41331066和41474059),中国地震局地震预测研究所基本科研业务费专项(2020IEF0508,2020IEF0502)和武汉大学地球空间环境与大地测量教育部重点实验室测绘基础研究基金(19-01-02)联合资助
详细信息
作者简介: 杨君妍, 女, 1988年生, 副研究员, 从事GRACE和GPS卫星在地球重力学中的应用.E-mail:yangjunyan1987@163.com
通讯作者: 孙文科, 男, 1956年生, 教授, 从事地震位错理论、重力观测与解释和重力卫星GRACE的研究.E-mail:sunw@ucas.edu.cn
中图分类号: P223收稿日期:2019-09-30
修回日期:2019-12-20
上线日期:2020-08-05
The theory and method of determining dislocation Love number and Green's function using geodetic data
YANG JunYan1,2,,SUN WenKe2,,
1. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
More Information
Corresponding author: SUN WenKe,E-mail:sunw@ucas.edu.cn
MSC: P223--> Received Date: 30 September 2019
Revised Date: 20 December 2019
Available Online: 05 August 2020
摘要
摘要:本文提出一种利用大地测量观测技术反演地震位错Love数及格林函数的理论和方法.首先根据地震位错理论建立理论同震变化和大地测量观测值之间的关系式;其次,以2011年Tohoku-Oki地震(MW9.0)为例,反演体现局部构造特征的地震位错Love数和格林函数.结果表明:反演得到的位错Love数与PREM模型下的位错Love数随深度和阶数变化不同,反映出局部三维地球模型的构造差异,由此计算的同震变化跟实际大地测量观测值的吻合度提高了~60%~~80%.通过大地测量观测数据反演的地震位错Love数能体现局部地球真实的构造信息,为该地区地震研究提供更加精确的地震位错格林函数.
关键词: 位错理论/
位错Love数/
GRACE/
GPS/
反演理论
Abstract:This paper proposes a theory and method of determining dislocation Love number and Green's function using geodetic observation data. Firstly, we establish the formula between theoretical deformation and geodetic observation. Then, a case study of the 2011 Tohoku-Oki earthquake (MW9.0) is used to invert the dislocation Love number. The inversion results show that there are differences between the dislocation Love number and the PREM model with depths and degrees, which reflects the local three-dimensional structural characteristics of Earth model. And the coseismic change calculated from our result coincides with the actual geodetic observations by ~60% to ~80%. The dislocation Love number estimated from geodetic observation data can better reflect the real local structural information of the Earth and provide more accurate dislocation Green's function for earthquake research in this region.
Key words:Dislocation theory/
Dislocation Love number/
GRACE/
GPS/
Inversion theory
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