1989年大同6.1级地震前后地下水位固体潮加卸载响应比的变化
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摘要
将加卸载响应比的理论和方法引入地下水位潮汐资料计算中,根据岩石的应变与应力的非线性响应分析了井水位固体潮加卸载响应比的物理机理,从理论上论证了用地下水位观测资料计算加卸载响应比的可行性并研究出利用地下水位对固体潮的响应来计算加卸载响应比的方法.以此方法计算了我国大华北地区近20 a 来地下水位的固体潮加卸载响应比,分析了1989 年大同6 .1 级地震前后地下水位固体潮加卸载响应比的变化.多数井的水位固体潮加卸载响应比在地震前6 ～12 个月出现升高异常变化.
The theory and method of the loading and unloading response ratio to the earth tide have been quoted in data calculation of tides of the gruondwater level.The feasibility for calculating the loading and unloading response ratio by means of the observation data of the gruondwater level is proved,and the calculation method has been showed.The loading and unloading response ratio of the groundwater level to the earth tide in the North China during the last 20 years has been calculated by this method,and the variation of loading and unloading response ratio of groundwater level to earth tides before and after the Datong M S6.1 earthquake in 1989 has been analyzed.Increasing anomaly variation of the loading and unloading response ratio of most of the well levels to the earth tides appeared from 6 to 12 monthes before the earthquake.
The theory and method of the loading and unloading response ratio to the earth tide have been quoted in data calculation of tides of the gruondwater level.The feasibility for calculating the loading and unloading response ratio by means of the observation data of the gruondwater level is proved,and the calculation method has been showed.The loading and unloading response ratio of the groundwater level to the earth tide in the North China during the last 20 years has been calculated by this method,and the variation of loading and unloading response ratio of groundwater level to earth tides before and after the Datong M S6.1 earthquake in 1989 has been analyzed.Increasing anomaly variation of the loading and unloading response ratio of most of the well levels to the earth tides appeared from 6 to 12 monthes before the earthquake.
引文
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[10] 张昭栋,等.井水位固体潮加卸载响应比的地震短临前兆[J] .地震学报,1997 ,2(1):174～180 .
[2] 尹祥础,尹灿.非线性系统失稳的前兆与地震预报[J].中国科学(B) ,1991 ,(5):512～518 .
[3] 尹祥础,陈学忠,宋治平,尹灿.加卸载响应比理论(LURR)[J].地球物理学报,1994 ,37:767 ～775[4] BredhoeftJD.Response of wellaquifer system to earthtides[J].J.Geophys.Res.,1967 ,72(12) :3075 ～3087.
[5] Narasinmhan TN,Kanehiro BY,Witherspon PA.Interpretationofearthtideresponseofthree deep,confined aquifers[J] .J.Geophys.Res.,1984 ,89(B3) :1913～1924 .
[6] 张昭栋,郑金涵,冯初刚.体膨胀固体潮对水位观测的影响[J] .地震研究,1986 ,9(4):465～472 .
[7] 张昭栋.地下水潮汐分析[ M] ,济南:山东大学出版社.1988 .25 ～79 .
[8] 张昭栋,郑金涵,冯初刚.深水井位的固体潮效应[J] .地震学报,1991,13(1) :66 ～75.
[9] 徐芝论.弹性力学[ M] ,北京:人民教育出版社.1982 .245 ～271 .
[10] 张昭栋,等.井水位固体潮加卸载响应比的地震短临前兆[J] .地震学报,1997 ,2(1):174～180 .
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