徐亚1,2,,
1. 中国科学院地质与地球物理研究所, 中国科学院油气资源研究重点实验室, 北京 100029
2. 中国科学院地球科学研究院, 北京 100029
3. 中国科学院大学, 北京 100049
基金项目: 国家自然科学基金项目(91428204和41374139)和中国科学院青年创新促进会(2016064)联合资助
详细信息
作者简介: 严畅达, 男, 1992年生, 湖北武汉人, 硕士, 研究方向为卫星重力的地震学应用.E-mail:yancd@whu.edu.cn
通讯作者: 徐亚, 男, 1980年生, 副研究员, 主要从事综合地球物理研究.E-mail:xuya@mail.iggcas.ac.cn
中图分类号: P228收稿日期:2018-03-17
修回日期:2018-11-15
上线日期:2019-06-05
Research of the long-term gravity change pattern related to Chile earthquake via GRACE RL05 data
YAN ChangDa1,2,3,,XU Ya1,2,,
1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
More Information
Corresponding author: XU Ya,E-mail:xuya@mail.iggcas.ac.cn
MSC: P228--> Received Date: 17 March 2018
Revised Date: 15 November 2018
Available Online: 05 June 2019
摘要
摘要:利用GRACE卫星重力可对地震引起的大范围重力变化进行观测，并从重力数据中发现主要的变化特征.发生于2010年的MW8.8智利地震震级较高，可观测到震中附近广泛的同震和震后长期重力变化.本文基于GRACE RL05 Level-2时变重力场数据，对2010年智利地震的同震和震后长期变化进行了计算.对同震变化的计算发现，智利地震引起的同震变化极值达-5 μGal，而本文为减小水文信号的干扰而采用的3年平均的方法可以获得良好的效果.在对震后重力变化的计算中发现，智利地震震后在2011—2016年间的重力变化存在先增大后逐渐衰减的过程.对震后变化的拟合表明，智利地震震中附近有约1μGal的震后重力变化，震后变化的特征时间约1.1年.同时，在智利地震中未出现较明显的两个震后变化阶段（短期、长期）.
关键词: 智利地震/
GRACE/
震后重力变化
Abstract:Large scale gravity change related to earthquakes could be observed by GRACE satellite gravity data and the changing patterns could be recognized. Co-seismic and post-seismic gravity change could be observed close to the epicenter of the MW8.8 Chile earthquake in 2010. This paper calculated the co-seismic and post-seismic gravity change of the 2010 Chile earthquake based on the GRACE RL05 Level-2 time-variable gravity data. From the co-seismic result, we discovered that the co-seismic maximum gravity change reached -5 μGal. Our method of reducing the disturbance of water mass change by calculating the 3-year average before and after the earthquake performed well. From the post-seismic result, we observed that the gravity change from 2011 to 2016 having a first increase then decrease pattern. The fitting to the post-seismic change revealed that the post-seismic gravity change is about 1μGal close to the epicenter, and the characteristic time is about 1.1 year. The Chile earthquake didn't show a typical post-seismic change of two terms (short and long).
Key words:Chile Earthquake/
GRACE/
Post-seismic gravity change
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http://www.geophy.cn/data/article/export-pdf?id=dqwlxb_15010
