印度Ms6.8地震区域重力场变化特征研究
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摘要
利用GRACE卫星测量数据,以3个月时间尺度计算了2011-07—09月印度地震区域的重力场变化,并将计算结果与2009年和2010年同一时间尺度的变化结果进行比较,结果显示,2009年研究区域的重力值变化为正,其中新德里、博帕尔、锡金邦地区重力变化均超过了4×10-8ms-2,表明此段时期内地壳应力处于积累状态,2010年同期重力变化较小,2011年地震区域重力变化较大,震中重力值较2009年变化了约6×10-8ms-2。强震就发生在重力变化梯度带内。
The gravity variations were computed in Indian earthquake region(76°~96°E,16°~36°N) with GRACE data observed from July to September in 2009,2010 and 2011 respectively taking the GRACE GGM03C gravity field model as a reference and then the monthly gravity variations of Indian mainland before and after the Gaussian smoothing were compared between each other.The computed result is the most reasonable when the radius of the Gaussian smoothing is 600 km.The results show that the gravity variation of the studied area was positive in 2009.The gravity variation changed more than 4×10-8ms-2 in New Delhi,Bhopal and Sikkim districts.In 2010,it was smaller than that in the same time,2009.The gravity variation change at the epicenter was of almost 6×10-8ms-2 in 2011 than that in 2009.The strong earthquake occurred within the steep gradient zone.
The gravity variations were computed in Indian earthquake region(76°~96°E,16°~36°N) with GRACE data observed from July to September in 2009,2010 and 2011 respectively taking the GRACE GGM03C gravity field model as a reference and then the monthly gravity variations of Indian mainland before and after the Gaussian smoothing were compared between each other.The computed result is the most reasonable when the radius of the Gaussian smoothing is 600 km.The results show that the gravity variation of the studied area was positive in 2009.The gravity variation changed more than 4×10-8ms-2 in New Delhi,Bhopal and Sikkim districts.In 2010,it was smaller than that in the same time,2009.The gravity variation change at the epicenter was of almost 6×10-8ms-2 in 2011 than that in 2009.The strong earthquake occurred within the steep gradient zone.
引文
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9罗志才.利用卫星重力梯度数据确定地球重力场的理论和方法[D].武汉测绘科技大学,1996.(Luo Zhicai.The-ory and method to determine the earth gravity field using sat-ellite gravity gradiometry data[D].Wuhan Technical Univer-sity of Surveying and Mapping,1996)
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2孙文科.地轨道人造卫星(CHAMP,GRACE,GOCE)与高精度地球重力场[J].大地测量与地球动力学,2002,(1):92-100.(Sun Wenke.Satellite in low orbit(CHAMP,GRACE,GOCE)and high precision earth gravity field[J].Journal of Geodesy and Geodynamics,2002,(1):92-100)
3 Valentin M.Can tectonic processes be recovered from newgravity satellite data?[J].Earth and Planetary Science Let-ters,2004,228:281-297.
4邹正波,等.GRACE月重力场模型的地震应用[J].大地测量与地球动力学,2007,(增):39-41.(Zou Zhengbo,et al.Seimological application of monthly gravity field modelsof GRACE[J].Journal of Geodesy and Geodynamics,2007,(Supp.):39-41)
5 Chen J L,et al.Spatial sensitivity of the gravity recovery andclimate experiment(GRACE)time-variable gravity observa-tions[J].JGR,2005,110(B9):8408-+,doi:10.1029/2004JB003536.
6邢乐林,等.GRACE卫星重力观测在强震监测中的应用及分析[J].大地测量与地球动力学,2010,(4):51-55.(Xing Lelin,et al.Application and analysis of GRACE satel-lite gravity observation in monitoring strong earthquake[J].Journal of Geodesy and Geodynamics,2010,(4):51-55)
7邢乐林,等.Sumatra-Adaman大地震同震和震后形变的GRACE卫星检测[J].武汉大学学报(信息科学版),2009,34(9):1 080-1 084.(Xing Lelin,et al.Detection ofco-seismic and post-seismic deformation caused by the Su-matra-Andaman earthquake using GRACE[J].Geomaticsand Information Science of Wuhan University,2009,34(9):1 080-1 084)
8段虎荣,等.利用GRACE卫星数据研究汶川地震前后重力场变化[J].地震研究,2009,32,(3):295-298.(Du-an Hurong,et al.Study of the gravity variance in Chinese ma-inland before and after Wenchuan earthquake with GRACEgravity models[J].Journal of Seismological Research,2009,32(3):295-298)
9罗志才.利用卫星重力梯度数据确定地球重力场的理论和方法[D].武汉测绘科技大学,1996.(Luo Zhicai.The-ory and method to determine the earth gravity field using sat-ellite gravity gradiometry data[D].Wuhan Technical Univer-sity of Surveying and Mapping,1996)
10 Swenson S and Wahr J.Methods for inferring regional sur-face mass anomalies from GRACE measurements of time-variable gravity[J].JGR,2002,107(B9):2193,doi:10.1029/2001JB000576.
11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.(ZouZhengbo,et al.Research of GRACE satellite gravity inChinese mainland and its vicinity[J].Journal of Geodesyand Geodynamics,2008,(1):23-27)
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