汶川8.0级地震前后表层水温的异常变化研究
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摘要
对汶川8.0级地震震中周围800km范围内73个井孔的表层水温资料进行了分析。根据设定的异常与不确定性异常判定依据,发现有9个井孔出现了前兆异常;有5个井孔的异常不能确定是否为前兆异常;有3个井孔出现了典型非前兆异常变化;其余未出现任何异常变化。分析认为异常存在早期、中期和晚期三个阶段,表现为缓变、突变和向下的阶梯状变化。对9个异常井孔的同井水位、气氡等其它流体测项以及同台或邻近台站形变仪器(钻孔应变、钻孔倾斜、洞体应变等)在表层水温异常变化时段内的动态变化特征进行了对比,发现地壳形变与表层水温在异常的晚期阶段具有一定的相关关系;而同井水位与表层水温异常的关系不大。
The data of water surface temperature before and after Wenchuan MS8.0earthquake in 2008from 73wells in the range of 800km from the epicenter are analyzed.According to the given judgment basis for anomaly and indeterminate anomaly,among the all observasing wells,9wells had seismic precursor anomalies,5wells had anomalies but can not be determined to have relation with the earthquake,3wells had typical"no-anomalous change" and others had no anomaly.It is considered that there are three periods in the anomalous appearance,which are early period with slow change,middle period with sudden change and late period with going down change.Meanwhile the dynamic change characteristics of water level,gas radon and other fluid measure items in the same wells,as well as some deformation items(strain in drill hole,tilt in drill hole,strain in tunnel body etc.)in the same stations or nearby stations(≤50km)are compared with the change of water surface temperature.It is found that crustal deformation anomaly is interrelationed with the late period of anomaly in water surface temperature,but anomaly of water level has nearly not relation with the temperature in same wells.
The data of water surface temperature before and after Wenchuan MS8.0earthquake in 2008from 73wells in the range of 800km from the epicenter are analyzed.According to the given judgment basis for anomaly and indeterminate anomaly,among the all observasing wells,9wells had seismic precursor anomalies,5wells had anomalies but can not be determined to have relation with the earthquake,3wells had typical"no-anomalous change" and others had no anomaly.It is considered that there are three periods in the anomalous appearance,which are early period with slow change,middle period with sudden change and late period with going down change.Meanwhile the dynamic change characteristics of water level,gas radon and other fluid measure items in the same wells,as well as some deformation items(strain in drill hole,tilt in drill hole,strain in tunnel body etc.)in the same stations or nearby stations(≤50km)are compared with the change of water surface temperature.It is found that crustal deformation anomaly is interrelationed with the late period of anomaly in water surface temperature,but anomaly of water level has nearly not relation with the temperature in same wells.
引文
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[2]王长岭,张慧.大震水化参量场兆与源兆判别指标的研究[J].地震,1999,19(2):155-160.
[3]刘耀炜.“九五”我国地震地下流体研究的主要科学进展[J].地震,2002,22(4):1-8.
[4]张燕,吴云,吕品姬,等。汶川8.0级地震前定点形变异常特征[J].地震学报,2009,31(2):152-159.
[5]赵刚,王军,何案华,等.全国地热前兆台网在汶川地震前的异常分析[M].北京:地震出版社,2009:436-444.
[6]赵小茂,黄辅琼,王新,等.“集中降雨”与浅层承压井水位及区域地震活动关系的初步研究[J].西北地震学报,2009,31(3):259-264.
[7]顾国华,王武星,徐岳仁,等.区域网GPS观测得到的2008年汶川MS8.0地震前的地壳水平运动[J].地震学报,2009,31(6):597-605.
[8]王武星,丁鉴海,余素荣,等.汶川MS8.0地震前地磁短临异常与强震预测探索[J].地震学报,2009,31(2):172-179.
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