日本9.0级和汶川8.0级地震引起云南地区井水温同震响应研究
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摘要
收集云南地区井水温数字化观测资料,对比分析了2011年3月11日日本9.0级和2008年5月12日汶川8.0级2次地震引起的云南地区井水温同震响应特征。结果表明,不同构造区域的观测井的井水温同震响应存在差异,主要与井孔本身的特征和区域构造环境有关;同一口观测井对不同地震引起的水温响应变化形态基本一致,不受地震方位和震源机制的影响,井水温同震下降或上升响应幅度随震级的增大而增大,随震中距的增大而减小;井水温同震响应的机理主要是在地震波的作用下,观测井孔中的水体受震荡激发而加速对流与掺混导致水温发生变化,当地震波逐渐平息,探头附近的井水温逐步恢复。
Based on water temperature digital data of wells in Yunnan province,the characteristics of coseismic changes of water temperature caused by Japan M9.0 and Wenchuan M8.0 earthquakes are analyzed.The results show that the characteristics are different in the different structure areas,and this may be related with the conditions,local geological structures and tectonic environments;the characteristics are similar in the same well for the different earthquakes,and they are not related with the earthquake direction and mechanism,but the temperature will be increased with the earthquake magnitudes or decreased with the epicentral distances.Under the dynamic loading of seismic wave,the accelerated convection and mixing of different temperature water in virtue of seismic wave caused water temperature changes,when the fluctuation of seismic wave gradually is quiet down,the water temperature near the probe begins to normal.
Based on water temperature digital data of wells in Yunnan province,the characteristics of coseismic changes of water temperature caused by Japan M9.0 and Wenchuan M8.0 earthquakes are analyzed.The results show that the characteristics are different in the different structure areas,and this may be related with the conditions,local geological structures and tectonic environments;the characteristics are similar in the same well for the different earthquakes,and they are not related with the earthquake direction and mechanism,but the temperature will be increased with the earthquake magnitudes or decreased with the epicentral distances.Under the dynamic loading of seismic wave,the accelerated convection and mixing of different temperature water in virtue of seismic wave caused water temperature changes,when the fluctuation of seismic wave gradually is quiet down,the water temperature near the probe begins to normal.
引文
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[10]刘耀炜,孙小龙,王世琴,等.井孔水温异常与2007年宁洱6.4级地震关系分析[J].地震研究,2008,31(4):347-353.
[11]车用太,刘成龙,鱼金子,等.井水温度微动态及其形成机制[J].地震,2008,28(4):20-28.
[2]刘耀炜,杨选辉,刘永铭,等.2004年印度尼西亚苏门答腊8.7级大地震及其对中国大陆地区的影响[C]//中国地震局监测预报司.地下流体对苏门答腊8.7级地震的响应特征.北京:地震出版社,2005:131-258.
[3]杨竹转,邓志辉,刘春国,等.中国大陆井水位与水温动态对汶川Ms8.0地震的同震响应特征分析[J].地震地质,2008,30(4):895-905.
[4]杨竹转,邓志辉,杨贤和,等.井孔水温动态变化的影响因素探讨[J].地震,2010,30(2):71-79.
[5]石耀霖,曹建玲,马丽,等.唐山井水温的同震变化及其物理解释[J].地震学报,2007,29(5):265-273.
[6]付虹,刘丽芳,王世琴,等.地方震及近震地下水同震震后效应研究[J].地震,2002,22(4):55-66.
[7]孙小龙,刘耀炜.宾川井对印尼大震的同震响应特征及其机理解释[J].地震,2008,28(3):69-77.
[8]鱼金子,车用太,刘五洲.井水温度微动态形成的水动力学机制研究[J].地震,1997,17(4):389-396.
[9]陈大庆,刘耀炜,杨选辉,等.远场大震的水位、水温同震响应及其机理研究[J].地震地质,2007,29(1):122-132.
[10]刘耀炜,孙小龙,王世琴,等.井孔水温异常与2007年宁洱6.4级地震关系分析[J].地震研究,2008,31(4):347-353.
[11]车用太,刘成龙,鱼金子,等.井水温度微动态及其形成机制[J].地震,2008,28(4):20-28.
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