九江—瑞昌M_s5.7地震前后地磁场水平分量异常追踪与分析
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摘要
本文利用九江瑞昌Ms5.7地震前后四期(震前一期,震后三期)地磁场三分量绝对测量观测数据,建立了震区四个不同时期地磁基本场水平分量的曲面样条模型,通过上述模型详细地追踪了九江瑞昌地震前后地磁基本场水平分量异常演变过程,分析了九江瑞昌地磁基本场水平分量异常的出现、衰减与九江—瑞昌地震的对应关系,并结合震区居里面埋深剖面图初步探讨了九江瑞昌Ms5.7地震的动力学背景.
By using the four-phases geomagnetic vector data before and after the M_s5.7 Jiujiang-Ruichang earthquake, we established the surface spline models of geomagnetic horizontal component in four periods.By comparing the above four models, we traced evolution processes of geomagnetic horizontal component before and after the M_s5.7 Jiujiang-Ruichang earthquake and analyzed the relations between the occurrence and attenuation of geomagnetic anomalies and the earthquake.
By using the four-phases geomagnetic vector data before and after the M_s5.7 Jiujiang-Ruichang earthquake, we established the surface spline models of geomagnetic horizontal component in four periods.By comparing the above four models, we traced evolution processes of geomagnetic horizontal component before and after the M_s5.7 Jiujiang-Ruichang earthquake and analyzed the relations between the occurrence and attenuation of geomagnetic anomalies and the earthquake.
引文
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[4] 高金田,安振昌,顾左文,等.地磁正常场的选取与地磁异常场 的计算[J].地球物理学报,2005,48(1) :56～62． Gao J T, An Z C, Gu Z W, et al.Selections of the geomagnetic normal field and calculations of the geomagnetic anomalous field[J].Chinese Journal of Geophysics ( in Chinese), 2005,48(1) :56～62．
[5] 安振昌.青藏高原地磁场模型的研究[J].地球物理学报,2000,43:339～345． An Z C.Studies on geomagnetic field models of Qinghai-Xizangf plateau[J].Chinese Journal of Geophysics, 2000,43:339～345．
[6] 孙劲松,刘天佑,吴小羊.九江-瑞昌地区重磁数据处理解释与地震灾害评价[J].工程地球物理学报,2007,4(3) :225～229． Sun J S, Liu T Y, Wu X Y.Gravity and magnetic data processing and earthquake disaster assessment of Jiujiang Ruichang area[J].Chinese Journal of Engineering Geophysics, 2007, 4(3) : 225～229．
[7] 张毅,顾左文,顾春雷,等.《2005． 0中国地磁图》在地震监测预报中的应用[J].地震地磁观测与研究,2007,28(3) :1～7． Zhang Y, Gu Z W, Gu C L, et al.The application of“Map of the Geomagnetic in China 2005． 0”in earthquake forecast[J].Seismological and Geomagnetic Observation and Research,2007,28(3) :1～7．
[8] 顾左文,陈斌,高金田,等.应用NOC方法研究中国地区地磁时空变化[J].地球物理学报,2009,52(10) :2602～2612． Gu Z W, Chen B, Gao J T, et al.Research of geomagnetic spatial-temporal variations in china by the NOC method[J].Chinese J.Geophys (in chinese), 2009,52(10) :2602～2612．
[9] 徐文耀,白春华,康国发.地壳磁异常的全球模型[J].地球物理学进展,2008,23(3) :641～651． Xu W Y,Bai C H, Kang G F.Global models of the Earth's crust magnetic anomalies[J].Progress in Geophysics (in Chinese), 2008,23(3) : 641～651．
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