电阻率多极距观测台站的电性结构模型及参数反演研究——以山丹台为例
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摘要
电阻率多极距观测系统相对于目前地震监测中普遍使用的单极距观测系统是一个进步。利用电阻率多极距观测数据,经正、反演计算后可获得不同深度层的等效(真)电阻率值,可有效地排除因人类活动等引起的表浅层干扰,从而获得可靠性高的电阻率异常。不过,在获得等效(真)电阻率之前,须获得台站的电性结构模型,而前人未对此进行详细研究。因此本文以甘肃省山丹地震台为例,利用电阻率层析成像结果和电阻率多极距观测数据,详细研究了如何获得台站的初始电性结构模型及最佳电性结构模型,期望能为今后电阻率多极距观测数据的处理提供有益的帮助。
Multi-separation array observation system is superior to the single separation array observation geoelectrical resistivity observation which is widely used in the present earthquake monitoring.The effective or true resistivity of different underground layers may be obtained via forward and inverse computations using the apparent resistivity from multi-separation array observation,which can be helpful to remove the disturbance originated from human activities and obtain the more reliable anomalies of resistivity in the end.However,before we obtain effective or true resistivity,we must obtain the electrical structure model of a station,which was not studied previously in detail.In the present paper,taking Shandan station as an example,we made detailed studies on how to obtain its initial and best-fit electrical structure model using electrical resistivity tomography and the resistivity from multi-separation array observation.We expect that it would be helpful to process these data in the future.
Multi-separation array observation system is superior to the single separation array observation geoelectrical resistivity observation which is widely used in the present earthquake monitoring.The effective or true resistivity of different underground layers may be obtained via forward and inverse computations using the apparent resistivity from multi-separation array observation,which can be helpful to remove the disturbance originated from human activities and obtain the more reliable anomalies of resistivity in the end.However,before we obtain effective or true resistivity,we must obtain the electrical structure model of a station,which was not studied previously in detail.In the present paper,taking Shandan station as an example,we made detailed studies on how to obtain its initial and best-fit electrical structure model using electrical resistivity tomography and the resistivity from multi-separation array observation.We expect that it would be helpful to process these data in the future.
引文
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[6]汪雪泉,郑兆苾,薛维龙.安徽嘉山台的多极距电阻率观测[J].地震学刊,2002,22(1):1～4.
[7]韦柳椰,吕玉增,阮百尧.MN不等于零时水平层状大地直流电阻率测深曲线的计算[J].物探化探计算技术,2006(1):26～28.
[8]程志平,电法勘探教程[M].北京:冶金工业出版社,2007.
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[12]王新华,赵跃辰,刘小伟.多层地电断面视电阻率的高精度计算[J].地球物理学报,1989,32(4):478～483.
①中国地震局地震预测研究所完成的“中国数字地震观测网络项目”的《中国地震前兆台网前兆台阵数据处理系统研究报告》(地电学科)(2007)中附件2“甘肃天祝台阵坪城观测点多极距地电阻率反演”。
[2]杨明芝,张孝文,赵和云.关于层状介质视电阻率响应系数的研究[J].西北地震学报,1986,8(2):25～37.
[3]赵和云,钱家栋.郫县台多极距观测资料的反演和分析[J].中国地震,1987,3(增刊):73～78.
[4]钱家栋,赵和云.地电阻率的数值模拟和多极距观测系统[J].地震学报,1988,10(1):77～88.
[5]薛顺章,温新民,董永德,等.地电阻率预报地震新方法的研究[J].地震学报,1994,16(2):227～234.
[6]汪雪泉,郑兆苾,薛维龙.安徽嘉山台的多极距电阻率观测[J].地震学刊,2002,22(1):1～4.
[7]韦柳椰,吕玉增,阮百尧.MN不等于零时水平层状大地直流电阻率测深曲线的计算[J].物探化探计算技术,2006(1):26～28.
[8]程志平,电法勘探教程[M].北京:冶金工业出版社,2007.
[9]DJ O’Neill,N P Merrick.A digital linear filter forresistivity sounding with a generalized electrode array[J].Geophysical Prospecting,1984,32:105～123.
[10]O Koefoed.Afast method for determining the layercontribution fromthe raised kernel function in geo-electrical sounding[J].Geophysical Prospecting,1970,18:564～570.
[11]Y Murakami,T Uchida.Accuracy of thelinear filtercoefficients determined by theiteration of the least-squares method[J].Geophysics,1982,47:244～256.
[12]王新华,赵跃辰,刘小伟.多层地电断面视电阻率的高精度计算[J].地球物理学报,1989,32(4):478～483.
①中国地震局地震预测研究所完成的“中国数字地震观测网络项目”的《中国地震前兆台网前兆台阵数据处理系统研究报告》(地电学科)(2007)中附件2“甘肃天祝台阵坪城观测点多极距地电阻率反演”。
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