新沂地震台地电阻率反向年变分析
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摘要
结合新沂地震台电测深曲线、测区地质剖面资料,建立了三维非均匀层状介质有限元模型.以第一层介质电阻率变化模拟表层介质电阻率随季节性降雨的变化,在模型中计算了3个测道的地电阻率年变化形态.计算结果表明,EW和N45°E测道地电阻率随表层介质电阻率的增减同向增减,而NS测道地电阻率则与表层介质电阻率变化相反.该结果符合新沂台3个测道实际观测的年变形态.
Combined with geologic section and electric sounding data,a threedimensional inhomogeneous finite element model was constructed to analyze annual variation of georesistivity at Xinyi seismic station.Resistivity variation of shallow layer,which was caused by seasonal rainfalls,was substituted with resistivity changes of the first layer in the finite element model.Annual variation of georesistivity in NS,EW and N45°E channels are calculated based on the model.Analyzed results of the model suggest that georesistivity in EW and N45°E direction increases/decreases with resistivity of the first layer increasing/decreasing,while georesistivity in NS direction varies in an reverse way.The model results accord with observations in the three monitoring directions at the Xinyi station.
Combined with geologic section and electric sounding data,a threedimensional inhomogeneous finite element model was constructed to analyze annual variation of georesistivity at Xinyi seismic station.Resistivity variation of shallow layer,which was caused by seasonal rainfalls,was substituted with resistivity changes of the first layer in the finite element model.Annual variation of georesistivity in NS,EW and N45°E channels are calculated based on the model.Analyzed results of the model suggest that georesistivity in EW and N45°E direction increases/decreases with resistivity of the first layer increasing/decreasing,while georesistivity in NS direction varies in an reverse way.The model results accord with observations in the three monitoring directions at the Xinyi station.
引文
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冯志生,杨建军,梅卫萍,耿杰,汪雪泉,刘义高.2004.华东地区地电阻率各向异性度的地震前兆异常特征初步研究[J].地震学报,26(2):223--227.
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刘允秀,陈华静,程瑞年,邹积英,高福旺.1999.地电阻率与地下水位、大气降水关系研究[J].中国地震,15(2):184 --189.
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钱家栋,曹爱民.1998.1976年唐山7.8级地震地电阻率和地下水前兆综合物理机制研究[J].地震,18(增刊):1--9.
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钱家栋,赵和云.1988.地电阻率的数值模拟和多极距观测系统[J].地震学报,10(1):77--89.
王志贤.1981.地电阻率年变化的一种物理解释[J].西北地震学报,3(3):43--47.
阎照文.2006.ANSYS10.0工程电磁分析技术与实例详解[M].北京:中国水利水电出版社:339--344.
张秀霞,李飞,杨冯威,孙春仙,肖飞.2009.蔬菜大棚对新沂地震台地电阻率的影响[J].地震地磁观测与研究,30 (增刊):32--36.
张学民.2004.地电阻率的年变畸变异常分析[J].地震地磁观测与研究,25(1):68--74.
张学民,李美,关华平.2009.汶川8.0级地震前的地电阻率异常分析[J].地震,29(1):108--115.
赵和云,钱家栋.1987.郫县台多极距观测资料的反演和分析[J].中国地震,3(增刊):73--78.
Lu J,Qian F Y,Zhao Y L.1999.Sensitivity analysis of the Schlumberger monitoring array:Application to changes of resistivity prior to the 1976earthquake in Tangshan,China[J].Tectonophysics,307(3/4):397--405.
Lu J,Xue S Z,Qian F Y,Zhao Y L,Guan H P,Mao X J,Ruan A G,Yu S R,Xiao W J.2004.Unexpected changes in resistivity monitoring for earthquakes of the Longmen Shan in Sichuan,China,with a fixed Schlumberger sounding array[J].Phys Earth Planet Inter,145(1/4):87--97.
O′Neill D J,Merrick N P.1984.A digital linear filter for resistivity sounding with a generalized electrode array[J].Geophys Prospect,32(1):105--123.
①江苏省地震局.2011.江苏省电磁观测台网地震预报效能评估报告.
①钱家栋.2008.江苏新沂和安徽蒙城地电阻率异常落实汇报.
冯志生,杨建军,梅卫萍,耿杰,汪雪泉,刘义高.2004.华东地区地电阻率各向异性度的地震前兆异常特征初步研究[J].地震学报,26(2):223--227.
桂燮泰,关华平,戴经安.1989.唐山、松潘地震前视电阻率短临异常图像重现性[J].西北地震学报,11(4):71--75.
金安忠.1981.地电阻率正常变化和台站电性剖面关系初步研究[J].地震学报,3(4):389--396.
李飞,陈有发.1999.新沂台电阻率异常与山东苍山地震[J].高原地震,11(2):67--69.
刘允秀,陈华静,程瑞年,邹积英,高福旺.1999.地电阻率与地下水位、大气降水关系研究[J].中国地震,15(2):184 --189.
钱复业,赵玉林,刘婕.1990.唐山7.8级地震地电阻率临震功率谱异常[J].地震,(3):33--38.
钱复业,赵玉林,于谋明.1982.地震前地电阻率异常变化[J].中国科学:B辑,(9):831--839.
钱家栋,曹爱民.1998.1976年唐山7.8级地震地电阻率和地下水前兆综合物理机制研究[J].地震,18(增刊):1--9.
钱家栋,陈有发,金安忠.1985.地电阻率法在地震预报中的应用[M].北京:地震出版社:103--107,187--225.
钱家栋,赵和云.1988.地电阻率的数值模拟和多极距观测系统[J].地震学报,10(1):77--89.
王志贤.1981.地电阻率年变化的一种物理解释[J].西北地震学报,3(3):43--47.
阎照文.2006.ANSYS10.0工程电磁分析技术与实例详解[M].北京:中国水利水电出版社:339--344.
张秀霞,李飞,杨冯威,孙春仙,肖飞.2009.蔬菜大棚对新沂地震台地电阻率的影响[J].地震地磁观测与研究,30 (增刊):32--36.
张学民.2004.地电阻率的年变畸变异常分析[J].地震地磁观测与研究,25(1):68--74.
张学民,李美,关华平.2009.汶川8.0级地震前的地电阻率异常分析[J].地震,29(1):108--115.
赵和云,钱家栋.1987.郫县台多极距观测资料的反演和分析[J].中国地震,3(增刊):73--78.
Lu J,Qian F Y,Zhao Y L.1999.Sensitivity analysis of the Schlumberger monitoring array:Application to changes of resistivity prior to the 1976earthquake in Tangshan,China[J].Tectonophysics,307(3/4):397--405.
Lu J,Xue S Z,Qian F Y,Zhao Y L,Guan H P,Mao X J,Ruan A G,Yu S R,Xiao W J.2004.Unexpected changes in resistivity monitoring for earthquakes of the Longmen Shan in Sichuan,China,with a fixed Schlumberger sounding array[J].Phys Earth Planet Inter,145(1/4):87--97.
O′Neill D J,Merrick N P.1984.A digital linear filter for resistivity sounding with a generalized electrode array[J].Geophys Prospect,32(1):105--123.
①江苏省地震局.2011.江苏省电磁观测台网地震预报效能评估报告.
①钱家栋.2008.江苏新沂和安徽蒙城地电阻率异常落实汇报.
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