远场大震同震水位振荡、水温下降类型机理初步研究
|
摘要
在2004年12月26日印尼苏门答腊M_s8．7级地震同震水位、水温变化类型的对比分类中,发现出相当具有规律性的一类变化类型：在某些观测井当水位出现振荡(水震波)的时候,同井水温绝大多数会有个几十分钟到数小时的从下降到恢复的过程。为此笔者又收集了其中的典型变化观测井,北京良乡井和河北唐山矿井2001年数字化以来30多次不同远场大震水位、水温的同震响应资料,发现无一例外都具有相同的规律性。在此基础上,笔者提出了对于同震水位振荡,温度下降的气体脱逸模式,并对气体脱逸的两种途径进行了动力学的分析。
During studying the characteristics of co-seismic and post-seismic water level and tem- perature changes in some wells of the subsurface fluid monitoring network of China,due to December 26,2004,Ms8.7 Sumatra Earthquake,we found a significant phenomenon: after the arrival of seismic waves,the water level oscillated,at the same time water tem- perature dropped quickly,and it took several tens of minutes to several hours for the wa- ter level and temperature to return to the pre-seismic level.We collected 30 far strong earthquakes data of two representative wells (LiangXiang well in Beijing City,Tang ShanKuang well in HeBai province).The same phenomenon was found in all cases.By comparing the hydrogeological and observational conditions of wells with water level oscil- lation but with or without water temperature change,we bring forth a mechanism to ex- plain this phenomenon:geogas escaping model.Finally,we analyzed the dynamic process of two ways for geogas escaping from water and rock.
During studying the characteristics of co-seismic and post-seismic water level and tem- perature changes in some wells of the subsurface fluid monitoring network of China,due to December 26,2004,Ms8.7 Sumatra Earthquake,we found a significant phenomenon: after the arrival of seismic waves,the water level oscillated,at the same time water tem- perature dropped quickly,and it took several tens of minutes to several hours for the wa- ter level and temperature to return to the pre-seismic level.We collected 30 far strong earthquakes data of two representative wells (LiangXiang well in Beijing City,Tang ShanKuang well in HeBai province).The same phenomenon was found in all cases.By comparing the hydrogeological and observational conditions of wells with water level oscil- lation but with or without water temperature change,we bring forth a mechanism to ex- plain this phenomenon:geogas escaping model.Finally,we analyzed the dynamic process of two ways for geogas escaping from water and rock.
引文
[1]Blanchard,F.B.,Byerly.A Study of a Well Gauge as a Seismograph.Bulletion of the Seismological Society of America.Vol.25,19a5.
[2]Rexin,E.E.,Oliver,J.,Prentiss,D.,Seismically-Induced Fluctuation of the Water Level in the Nunn-Bush Well in Milwaukee.Bulletion of the Seismological Society of America.Vol.52,No.1,1962.
[3]张昭栋等，井水位振荡试验及其结果，地震地质，14(2)：183～188，1992。
[4]付子忠，地热动态观测与地热前兆，地壳构造与地壳应力，1(1)：1～7，1988。
[5]鱼金子等，井水温度微动态形成的水动力学机制研究，地震，17(4)：389～396，1997。
[6]Valiya M.Hamza Tectonic leakage of fault bounded aquifers subject to non-isothermal recharge:a mechanism generating thermal precursors to seismic events,Physics of the Earth and Planetary Interiors 126 (2001) 163～177,2001.
[7]鲁钟琪，气泡动力学，两相流与沸腾传热，146～157，北京：清华大学出版社，2002。
[2]Rexin,E.E.,Oliver,J.,Prentiss,D.,Seismically-Induced Fluctuation of the Water Level in the Nunn-Bush Well in Milwaukee.Bulletion of the Seismological Society of America.Vol.52,No.1,1962.
[3]张昭栋等，井水位振荡试验及其结果，地震地质，14(2)：183～188，1992。
[4]付子忠，地热动态观测与地热前兆，地壳构造与地壳应力，1(1)：1～7，1988。
[5]鱼金子等，井水温度微动态形成的水动力学机制研究，地震，17(4)：389～396，1997。
[6]Valiya M.Hamza Tectonic leakage of fault bounded aquifers subject to non-isothermal recharge:a mechanism generating thermal precursors to seismic events,Physics of the Earth and Planetary Interiors 126 (2001) 163～177,2001.
[7]鲁钟琪，气泡动力学，两相流与沸腾传热，146～157，北京：清华大学出版社，2002。
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心