地电阻率的数值模拟和多极距观测系统
EARTH RESISTIVITY MODELLING AND OBSERVATIONAL SYSTEM WITH MULTI-SEPERATION OF ELECTRODS
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摘要: 本文利用高精度的多层水平层状介质视电阻率计算公式,模拟了不同结构剖面、不同装置极距、不同规律的真电阻率变化,以及这种变化在介质中所处不同部位条件下地表视电阻率变化的计算结果;讨论了发生于介质中的真电阻率随时间变化在上述各种不同条件下,与在地表观测到的地电阻率(即视电阻率)变化两者之间的关系;指出为了解次异常变化与干扰变化的识别问题,应当将现行单一极距观测改造为多极距观测,并研究和发展相应的地电阻率随时间变化的反演技术和方法,以促进地电阻率法预报地震从看图识字的被动状态向物理预报方向转化。Abstract: This paper deals with the modellings of temporal changes in earth resistivity (i.e. apparent resistivity) on the surface of the earth with various electrical structure parameters and various configuration parameters (seperation of electrods), caused by some temporal changes in the true resistivity of different kinds and in different locations inside the earth in terms of the mathematical formula of apparent resistivity for a multilayer model. The relations bet-tween the observed temporal change in apparent resistivity on the earth surface and the temporal changes in the true resistivity existing inside the media have also been discussed. This suggests that in order to solve the problem of discriminating the anomlous changes from inter-ferrence influences, the observational system with single seperation between electrodes currently in operation at most monitoring stations in China should be changed into that with multi--separations, and the technique of inverse for temporal changes in apparent resistivity should be developed to realize the transition from earthquake prediction through guess work to prediction based on physical principles in the study of earthquake prediction.
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[1] 北京大学地球物理教研室地电组、兰州地震大队预报室,岩石视电阻率与压力关系的实验,北京大学学报,1978,2: 92——100,
[2] 张同俊,矿井岩层受力状态与视电阻率关系的实验研究,西北地震学报,1981,3,1,1——21,
[3] 金安忠,山东临沂地电台消除表层影响实验,西北地震学报,1980,2,2,10——63,
[4] Brace, W.F., and A.S. Orange, Electrical resistivity changes in saturated rocks during fracture and fractional Sliding,].Geoplzys. Res., 1968, 73, 1433——114
[5] Qian Jiadong, Gui Xitai, Ma Huaizhou, Ma Xikang, Guan Huaping and 'lhao Qingming, Observations of Apparent Resistivity in the Shallow Crust before and after Several Great Shallow Earthquakes, Proceedings of the International Symposium on Eart'ncluake Prediction, 14,1984, UNESCO, Paris.
[6] 金安忠,地电阻率正常变化与地电剖面的关系,地震学报,1981,3,421——428 .
[7] 金安忠,地电阻率正常变化的初步研究,地球物理学报,1981,24,92——111
[8] 王燕成、薛顺章,地电阻率年变化的初步研究,西北地震学报,1955,1,130——143,
[9] 赵和云、张文孝、杨明芝,地电阻率观测中一类反常年变化的分析讨论,西北地震学报,1985,7,1,4——11,
[10] 钱家栋、赵和云、张文孝,水平层状介质视电阻率的高精度计算公式及其误差分析,西北地震学报,1986, 5.2,10——19.
[11] 钱家栋、陈有发、金安忠,地电阻率法在地震预报中的应用,l03——107;1966,地震出版社.[1] 北京大学地球物理教研室地电组、兰州地震大队预报室,岩石视电阻率与压力关系的实验,北京大学学报,1978,2: 92——100,
[2] 张同俊,矿井岩层受力状态与视电阻率关系的实验研究,西北地震学报,1981,3,1,1——21,
[3] 金安忠,山东临沂地电台消除表层影响实验,西北地震学报,1980,2,2,10——63,
[4] Brace, W.F., and A.S. Orange, Electrical resistivity changes in saturated rocks during fracture and fractional Sliding,].Geoplzys. Res., 1968, 73, 1433——114
[5] Qian Jiadong, Gui Xitai, Ma Huaizhou, Ma Xikang, Guan Huaping and 'lhao Qingming, Observations of Apparent Resistivity in the Shallow Crust before and after Several Great Shallow Earthquakes, Proceedings of the International Symposium on Eart'ncluake Prediction, 14,1984, UNESCO, Paris.
[6] 金安忠,地电阻率正常变化与地电剖面的关系,地震学报,1981,3,421——428 .
[7] 金安忠,地电阻率正常变化的初步研究,地球物理学报,1981,24,92——111
[8] 王燕成、薛顺章,地电阻率年变化的初步研究,西北地震学报,1955,1,130——143,
[9] 赵和云、张文孝、杨明芝,地电阻率观测中一类反常年变化的分析讨论,西北地震学报,1985,7,1,4——11,
[10] 钱家栋、赵和云、张文孝,水平层状介质视电阻率的高精度计算公式及其误差分析,西北地震学报,1986, 5.2,10——19.
[11] 钱家栋、陈有发、金安忠,地电阻率法在地震预报中的应用,l03——107;1966,地震出版社.
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