GRACE探测强地震重力变化
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摘要
利用GRACE卫星重力资料,计算中国及周缘地区重力场年变化,探讨重力场年变化特点。对几次大地震前后重力场变化特征的分析显示,大地震前震源区附近会出现大范围正变化,震后逐渐转变为负异常,汶川Ms8.0地震前后的局部重力场变化也具有相同特征。研究结果表明,大地震对局部重力场影响明显,卫星重力具有探测强地震重力变化的能力。
Annual gravity changes in China mainland and its vicinity are calculated from GRACE data,and the characteristics of annual changes are discussed.By analyzing the gravity changes before and after several strong earthquakes,the results show that the gravity in the epicenter zone appears positive before the earthquake and converts to negative after the shock.The calculation of the gravity before and after the Wenchuan earthquake shows the same phenomenon.It is concluded that the regional gravity field is affected by strong earthquakes,and gravity satellites have the ability of detecting gravity changes caused by strong earthquakes.
Annual gravity changes in China mainland and its vicinity are calculated from GRACE data,and the characteristics of annual changes are discussed.By analyzing the gravity changes before and after several strong earthquakes,the results show that the gravity in the epicenter zone appears positive before the earthquake and converts to negative after the shock.The calculation of the gravity before and after the Wenchuan earthquake shows the same phenomenon.It is concluded that the regional gravity field is affected by strong earthquakes,and gravity satellites have the ability of detecting gravity changes caused by strong earthquakes.
引文
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8 郭俊义.物理大地测量学基础[M].武汉:武汉测绘科技大学出版社,1994.(Guo Junyi.Geophysics basis[M].Wu-han:Wuhan University of Surveying and Mapping Press,1994)
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2 Han S C,et al.Crustal dilatation observed by GRACE after the2004Sumatra-Andaman Earthquake[J].Sicence,2006,313(5787):658-622.
3 王丹,等.地面重力时空变化向卫星高度的解析延拓[J].大地测量与地球动力学,2005,(2):69-74.(Wang Dan.Upward continuation of ground gravity space-time change to satellite height[J].Journal of Geodesy and Geodynamic,2005,(2),69-74)
4 Chen J L,et al.GRACE detects coseismic and postseismic deformation from the Sumatra-Andaman earthquake[J].Geo-phys.Res.Lett.,2007,34(13):L1330210.1029/2007GL030356.
5 孙文科.地震火山活动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,(4):44-53.(Sun Wenke.Progress and current situation of research on the theory and observation of gravity change caused by seismicity and volcanism[J].Journal of Geodesy and Geodynamic,2008,(4):44-53)
6 邹正波,等,中国大陆及邻区GRACE卫星重力变化研究[J].大地测量与地球动力学,2008,(1):23-27.(Zou Zhengbo,et al.GRACE satellite gravity change research in Chinese mainland and its vicinity[J].Journal of Geodesy and Geodynamic,2008,(1):23-27)
7 周新,等.GRACE时变重力场中的高斯平滑研究[J].大地测量与地球动力学,2008,(3):41-45.(Zhou Xin,et al.The study of Gaussian smoothing in the application of GRACE temporal gravity[J].Journal of Geodesy and Geody-namic,2008,(3):41-45)
8 郭俊义.物理大地测量学基础[M].武汉:武汉测绘科技大学出版社,1994.(Guo Junyi.Geophysics basis[M].Wu-han:Wuhan University of Surveying and Mapping Press,1994)
9 陈志明.汶川地震成因及其大陆地震动力源探讨[J].江苏地质,2008,32(2):81-85.(Chen Zhiming.Discussions on origin of Wenchuan earthquake and its continental quake dynamic source[J].Jiangsu Geology,2008,32(2):81-85)
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