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.
出处
《西北地震学报》
CSCD
北大核心
2010年第4期367-375,共9页
Northwestern Seismological Journal
基金
青海省地震科学基金(2008A02)
关键词
汶川8级地震
表层水温
地壳形变
异常
Wenchuan MS8.0earthquake
Water surface temperature
Crustal deformation
Anomaly
