汶川8.0级地震氡观测值震后效应特征初步分析
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摘要
文中收集了2008年5月12日的四川汶川8.0级地震放射性同位素氡的观测资料,初步分析了汶川地震氡观测值震后效应的特征。结果表明,氡震后效应的观测点大多沿着地震破裂带分布即在震源北侧的北东向与南侧的南北向,变化以阶变上升型为主,而且部分观测点发生了可能与氡射气浓度相关的水位或流量同步变化。截止到2008年10月,大部分产生震后效应的观测点已经恢复到原来测值状态,但仍有少部分测点保持震后变化的的高值或低值,甚至有的测点继续上升。对氡震后效应的初步统计分析结果,肯定了氡射气具有对地震波响应的特点,也提出了研究地球化学组分变化与含水层动力过程的关系等问题,这有利于氡的地震前兆机理的研究。
Based on observed data of radioactive isotope radon,this paper analyzes the characteristics of post-seismic effect of gas radon and water radon from the 12 May,2008.Wenchuan 8.0 earthquake.The results show that the observation points which exhibit post-seismic effect of radon are mainly distributed in the north-east and south of epicenter along the earthquake rupture zone,and the variation style is mainly step-wise rising.Some observation points exhibit changes of water levels and flow possibly associated with radon changes.Up to October 2008,most observation points which showed post-seismic effect of radon have restored to the original values,however,there have still been a small number of points maintaining high or low value,and some points even continue to rise or fall.The statistical results confirms radon changes in response to seismic waves.We also put forward some scientific issues,such as the study of dynamic relationship between the chemical composition of groundwater and aquifer,which may useful to the study of the mechanism of earthquake precursors of radon.
Based on observed data of radioactive isotope radon,this paper analyzes the characteristics of post-seismic effect of gas radon and water radon from the 12 May,2008.Wenchuan 8.0 earthquake.The results show that the observation points which exhibit post-seismic effect of radon are mainly distributed in the north-east and south of epicenter along the earthquake rupture zone,and the variation style is mainly step-wise rising.Some observation points exhibit changes of water levels and flow possibly associated with radon changes.Up to October 2008,most observation points which showed post-seismic effect of radon have restored to the original values,however,there have still been a small number of points maintaining high or low value,and some points even continue to rise or fall.The statistical results confirms radon changes in response to seismic waves.We also put forward some scientific issues,such as the study of dynamic relationship between the chemical composition of groundwater and aquifer,which may useful to the study of the mechanism of earthquake precursors of radon.
引文
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[15]车用太,鱼金子,刘五洲.水氡异常的水动力学机制[J].地震地质,1997,19(4):353-357.
[2]水化学地震预报经验交流会.关于水化学方法预报地真的几点建议[J].地震战线,1971,(5):12-23.
[3]张炜,林颐乐.地震前兆水化特征及讨论[J].地震战线,1978,(6):24-31.
[4]杉崎隆一,田公兴译.地球化学方面的地震预报问题——日本地震预报的态势[J].国外地震,1979,(5):1-8.
[5]瓦尔抄尔ГМ.地震水文地球化学前兆[M].张炜等译.北京:地震出版社,1989.
[6]李宣瑚.水氡异常的扩散收缩现象[J].地震,1981,1(5):41-43.
[7]刘耀炜,施锦.强震地下流体前兆信息特征[J].地震学报,2000,22(1):59-64.
[8]北京市地震队.爆破地震、氡气、天然地震[J].地震战线,1971,(6):10-21.
[9]余兆康.两种类型爆破的水文地球化学效应的初步研究[J].地震地质,1986,8(1):13-22.
[10]张炜主编.水文地球化学地震前兆观测与预报[M].北京:地震出版社,1992.
[11]罗光伟,石锡忠.岩石标本受压时氡和钍射气量的实验结果[J].地震学报,1980,2(2):198-204.
[12]张远城,蔡诗凰,蔡作馨,等.高温热水孔逸出气氡观测实验研究[J].地震,1994,14(6):76-80.
[13]张炜,史勇,张平.地下水中逸出气氡的研究——水化地震前兆新项目探索[J].中国地震,1992,8(1):18-25.
[14]张新基,张慧.地下水中氡的不同存在形式及其映震效能差异性的研究[J].西北地震学报,2004,18(1):16-21.
[15]车用太,鱼金子,刘五洲.水氡异常的水动力学机制[J].地震地质,1997,19(4):353-357.
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