| 日本Mw9.0地震前GRACE卫星重力变化 |
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| 引用本文： | 邹正波,罗志才,吴海波,申重阳,李辉.日本Mw9.0地震前GRACE卫星重力变化[J].测绘学报,2012,41(2):171-176. |
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| 作者姓名： | 邹正波 罗志才 吴海波 申重阳 李辉 |
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| 作者单位： | 1. 武汉大学测绘学院;2. 武汉大学测绘学院，地球空间环境与大地测量教育部重点实验室;3. 中国地震局地震研究所; |
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| 基金项目： | 地震行业科研专项，国家自然科学基金青年科学基金项目，中国地震局地震研究所基金 |
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| 摘 要： | 利用GRACE重力卫星月重力场数据，通过去相关与高斯滤波等方法获取日本大地震震前震源区周缘年度、季度和年度差分重力变化，以及若干点位时间序列重力变化；分析结果表明:日本大地震前5年内在震源区周边出现了比较明显的卫星重力异常正负交替和迁移现象，至震前1－2年，震区周边形成了明显正负异常区，正重力异常区重力增加现象明显；点位重力时间序列分布指出了日本MW9.0级地震前存在与1976年唐山地震类似的重力变化现象。这些结果反映了日本大地震震前震源区周边地下物质运动、质量迁移和能量积累等问题，为研究该地震的孕育过程提供了证据。
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| 关 键 词： | GRACE 卫星重力 重力变化 日本地震 时间序列 |
| 收稿时间： | 2011-05-24 |
| 修稿时间： | 2011-06-28 |
Gravity Changes Observed by GRACE before the Japan M_W9.0 Earthquake |
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| ZOU Zhengbo,LUO Zhicai,WU Haibo,SHEN Chongyang,LI Hui.Gravity Changes Observed by GRACE before the Japan M_W9.0 Earthquake[J].Acta Geodaetica et Cartographica Sinica,2012,41(2):171-176. |
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| Authors: | ZOU Zhengbo LUO Zhicai WU Haibo SHEN Chongyang LI Hui |
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| Institution: | 2,3 1.School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;2.Institute of Seismology,CEA,Wuhan 430071,China;3.Crustal Movement Laboratory,Wuhan 430071,China |
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| Abstract: | The decorrelation and Gaussian smoothing method is implemented in GRACE monthly gravity field products to obtain annual and seasonal gravity changes in Japan and its vicinity,as well as time series gravity changes of several points.Results show regional gravity fields in Japan and its vicinity varied from positively to negatively and from area to area in five years before the Japan MW 9.0 earthquake,obviously positive to negative gravity changes were formed in 1~2 years.Time series gravity changes of several points indicate the Japan earthquake displayed the similar time variation gravity phenomenon with the 1976 Tangshan earthquake in China.These results reflect mass migration,mass movement and energy accumulation in Japan and its vicinity before the earthquake occurred. |
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| Keywords: | GRACE satellite gravity gravity variation Japan earthquake time series |
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