中国大陆科学钻探主孔流体异常与其附近2次ML3.9级地震的关系

2001年11月30日和12月25日中国大陆科学钻探主孔(CCSD)附近发生了2次ML3．9级地震。从日均值图上看,地震前后中国大陆科学钻探主孔流体测值曲线存在明显的异常现象。通过流体组分的最大相关系数分析知道,除Ar和CO2组分两者相关性较差(最大相关系数平均值为0．632,均方差为0．223)之外,其他组分间的相关性较好,最大相关系数在地震前后均出现明显的异常波动。从日均值和最大相关系数异常来看,大陆科学钻探主孔中的地下流体异常与该区的地震活动可能存在一定关系。

Anomalous fluid compositions in mud of the CCSD main well and their relations to two nearby earthquakes of ML 3.9

Two earthquakes of ML 3.9 occurred near the CCSD main hole on November 30 and December 25, 2001 respectively. The daily mean variation maps show that a pronounced anomalous phenomenon existed on the curves of fluid compositions in mud of the CCSD main hole before and after the earthquakes. Analysis of the maximum correlation coefficient of the fluid components indicates that all the fluid components are well correlated except Ar and CO2 which are poorly correlated (with a mean maximum correlation coefficient of 0.632 and a mean square deviation of 0.223). Distinct anomalous fluctuations of the maximum correlation coefficient took place both before and after the earthquakes. The daily mean values and anomalous maximum correlation coefficients suggest that the fluid anomalies appearing in the CCSD main hole might have a certain relation to seismic activities in the area.