临潼地震台水温与远近场地震关系研究

A study on the relationship between water temperature in Lintong Seismic Station and the far and near-field earthquake

系统分析临潼地震台水温20多年的连续观测数据变化特征,提取水温的正常动态与异常形态,及其与远、近场地震的关系,取得以下结果:水温较规则的夏高冬低的年周期动态特征,为正常动态;持续上升—转折下降及年周期消失属于异常动态;异常动态与青藏块体及其周缘M≥7.5远场大震以及该台所处的渭河盆地M_L≥4地震存在较好的相关性。结果对揭示1988年以来青藏高原块体的地球动力学条件具有一定指示意义。

In this paper, we systematically analyzed the variation of water temperature of daily observations during 20 years in Lintong Seismic Station. The normal dynamics and abnormal dynamics of water temperature were extracted and the relationship between water temperature dynamics and the earthquake of far and near-field（around the Tibetan Plateau block and Lintong observatory, respectively） are present here. The preliminary study can be concluded as the following aspects. Water temperature has an almost regular annual cycle with high variation in summer and low variation in winter, and then initial analysis showed that it is related with the cyclical extraction. Therefore, it belongs to normal dynamics. The variation that water temperature conties to rise, then turn down and disappear of annual cycle belongs to abnormal dynamic. There is a good correlation between abnormal dynamics and the far-field earthquake of M≥7.5 in Tibetan Plateau block. Also, there is a good correlation between abnormal dynamic and the near-field earthquake of ML〉4 in the Weihe River basin where the observatory is located. Our approach provides a reference for revealing the geodynamic conditions of the Tibetan Plateau Block since 1988.