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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 surface water temperature data of 73 boreholes within 800km around the epicenter of the MS 8.0 Wenchuan earthquake were analyzed. According to the anomalous anomalies and uncertainties, 9 boreholes were found to have precursory anomalies; 5 borehole anomalies could not be identified as precursory anomalies; 3 boreholes showed typical non-precursor anomalous changes ; The rest did not show any abnormal changes. The analysis shows that there are three stages of abnormal early, middle and late stages, which are gradual changes, sudden changes and downward steps. The dynamic characteristics of water level, gas radon and other fluid measurements of 9 abnormal wells, as well as the deformation of the deformation instruments (borehole strain, borehole inclination, strain of the cave body, etc.) on the same or adjacent stations during the abnormal change of surface water temperature It is found that there is a certain correlation between crustal deformation and surface water temperature in the late stage of anomaly. However, the relationship between the water level in the same well and the surface water temperature is not significant.