日本M_W9.0地震前GRACE卫星重力变化
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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。反映出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。
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.
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.
引文
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[2]LI Ruihao,HUANG Jianliang,LI Hui,et al.The Mechanismof Regional Gravity Variation before and after the TangshanEarthquake[J].Acta Seismologica Sinica,1997,19(4):399-407.(李瑞浩,黄建梁,李辉,等.唐山地震前后区域重力场变化机制[J].地震学报,1997,19(4):399-407.)
[3]SHEN Chongyang,LI Hui,SUN Shaoan,et al.DynamicVariations of Gravity and the Preparation Process of theWenchuan Ms8.0 Earthquake[J].Chinese J Geophys,2009,52(10):2547-2557.(申重阳,李辉,孙少安,等.重力场动态变化与汶川Ms8.0地震孕育过程[J].地球物理学报,2009,52(10):2547-2557.)
[4]WANG Zhengtao.Theory and Methodology of Earth GravityField Recovery by Satellite to Satellite Tracking Data[D].Wu-han:Wuhan University,2005.(王正涛.卫星跟踪卫星测量确定地球重力场的理论与方法[D].武汉:武汉大学,2005.)
[5]ZOU Xiancai,LI Jiancheng,WANG Haihong,et al.Application of Parellel Computing with OpenMP in DataProcessing for Satellite Gravity[J].Acta Geodaetica etCartographica Sinica,2010,39(6):636-641.(邹贤才,李建成,汪海洪,等.OpenMP并行计算在卫星重力数据处理中的应用[J].测绘学报,2010,39(6):636-641.)
[6]XIAO Yun,XIA Zheren,WANG Xingtao.Recovering theEarth Gravity Field from Inter-satellite Range-rate ofGRACE[J].Acta Geodaetica et Cartographica Sinica,2007,36(1):19-25.(肖云,夏哲仁,王兴涛.用GRACE星间速度恢复地球重力场[J].测绘学报,2007,36(1):19-25.)
[7]HAN S C,SHUM S K,BEVIS M.Crustal DilatationObserved by GRACE after the 2004 Sumatra-AndamanEarthquake[J].Science,2006,313(5787):658-666.
[8]CHEN J L,WILSON C R,TAPLEY B D.GRACEDetects Coseismic and Postseismic Deformation from theSumatra-Andaman Earthquake[J].Geophysical ResearchLetters,2007.34(13):1-5.
[9]EINARSSON I,HOECHNER A,WANG R,et al.GravityChanges due to the Sumatra-Andaman and Nias Earth-quakes as Detected by the GRACE Satellites:A Reexami-nation[J].Geophysical Journal International,2010.183(2):733-747.
[10]LI Jin,SHEN Wenbin.Investigation of the Co-seismicGravity Field Variations Caused by the 2004Sumatra-Andaman Earthquake Using Monthly GRACE Data[J].Journal of Earth Science,2011,22(2):280-291.
[11]ZOU Zhengbo,LUO Zhicai,LI Hui,et al.Detection ofGravity Changes before and after Strong Earthquakes byGRACE[J].Journal of Geodesy and Geodynamics,2010,30(2):6-9.(邹正波,罗志才,李辉,等.GRACE探测强地震重力变化[J].大地测量与地球动力学,2010,30(2):6-9.)
[12]WANG Wuxing,SHI Yaolin,GU Guohua,et al.GravityChanges Associated with the Ms8.0Earthquake Detectedby GRACE[J].Chinese J Geophys,2010,53(8):1767-1777.(王武星,石耀霖,顾国华,等.GRACE卫星观测到的与汶川Ms8.0地震有关的重力变化[J].地球物理学报,2010:53(8):1767-1777.)
[13]HAN S C,SAUBER J,LUTHCKE S.Regional GravityDecrease after the 2010 Maule(Chile)EarthquakeIndicates Large-scale Mass Redistribution[J].GeophysicalResearch Letters,2010,37(23):1-5.
[14]SUN Wenke.Progress and Current Situation of Researchon Theory and Observation of Gravity Change Caused bySeismicity and Volcanism[J].Journal of Geodesy andGeodynamics,2008,28(4):44-53.(孙文科.地震火山活动产生重力变化的理论与观测研究的进展及现状[J].大地测量与地球动力学,2008,28(4):44-53.)
[15]VIRON D O,PANET I,MIKHAILOV V,et al.RetrievingEarthquake Signature in GRACE Gravity Solutions[J].Geophysical Journal International,2008,174(1):14-20.
[16]BETTADPUR S.CSR Level-2 Processing StandardsDocument for Product Release 04[R].Austin:Center forSpace Research,2007:327-742.
[17]SWENSON S,WAHR J.Post-processing Removal ofCorrelated Errors in GRACE Data[J].GeophysicalResearch Letters,2006,33(8):1-4.
[18]ZOU Zhengbo,LI Hui,LUO Zhicai,et al.SeasonalGravity Changes Estimated from GRACE Data[J].Geodesy and Geodynamics,2010,1(1):57-63.
[19]JIA Minyu,ZHAN Jiehui.The Structure and Ability ofthe China Seismological Gravity Monitoring System[J].Acta Seismologica Sinica,2000,22(4):360-367.(贾民育,詹洁晖.中国地震重力监测体系的结构与能力[J].地震学报,2000,22(4):360-367.)
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