| 基于GRACE RL05数据研究智利地震长期震后重力变化特征 |
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| 引用本文： | 严畅达, 徐亚. 2019. 基于GRACE RL05数据研究智利地震长期震后重力变化特征. 地球物理学报, 62(6): 2115-2127, doi: 10.6038/cjg2019L0642 |
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| 作者姓名： | 严畅达 徐亚 |
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| 作者单位： | 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 |
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| 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. |
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| 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）.
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| 关 键 词： | 智利地震 GRACE 震后重力变化 |
| 收稿时间： | 2018-03-17 |
| 修稿时间： | 2018-11-15 |
Research of the long-term gravity change pattern related to Chile earthquake via GRACE RL05 data |
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| YAN ChangDa, XU Ya. 2019. Research of the long-term gravity change pattern related to Chile earthquake via GRACE RL05 data. Chinese Journal of Geophysics (in Chinese), 62(6): 2115-2127, doi: 10.6038/cjg2019L0642 |
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| Authors: | YAN ChangDa XU Ya |
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| Affiliation: | 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 |
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| 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). |
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| Keywords: | Chile Earthquake GRACE Post-seismic gravity change |
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