玉树地震前的地下流体观测井温度数据超差异常及其与地震关系研究

Research on the relations between the overproof of the temperature data before the Yushu earthquake of ground fluid monitoring wells and the Yushu earthquake

本文收集整理了距2010年4月14日玉树7.1级地震震中700km范围内的全部13个地下流体观测井孔的温度观测资料,统计分析了2008年5月以来各井温度当月超过3倍均方差的数据个数(以下简称月超差个数)。结果发现,在玉树地震前6个月,13个观测井中有10个井观测数据出现月超差个数升高现象,有4个观测井月超差个数出现了同震升高和震后升高现象。2008、2009年大柴旦发生的2次6级以上地震前,也有类似现象。此异常现象可能反映了玉树地震前场兆和源兆的共同作用过程。

This paper collects and files the data of all the 13 observation wells for underground within a radius of 700km from the Yushu MsT. 1 earthquake on April 14, 2010, and analyzes the number of the data which are more than three times of the mean square deviation of the month overproof from May, 2008. It is found that the number of month overproof increased in ten wells six months before the earthquake, four wells increased coseismicly and after the event. The similar phenomena were also found before the two earthquakes with M 6. 0 in the Dachaidan region from 2008. Those abnormal phenomena may reflect the interaction of the field precursor and the source precursor before the Yushu earthquake.