新20号井水位异常特征分析

ANALYSIS ON ABNORMAL CHARACTERISTICS OF WATER LEVEL OF NEW NO.20 WELL

运用m apsis软件前兆异常分析中的差分、从属函数和变差对新20号井水位进行异常识别,结果认为:(1)差分、从属函数和变差异常形态均为高值异常;(2)差分和变差对近场MS≥5地震漏报率较高,但有异常出现时,后续往往有地震对应,而从属函数对近场MS≥5映震率为66.7%,对远场MS≥7映震率为71.4%;(3)差分最大异常量与震级基本成正比,而与震中距基本上成反比。从属函数最大异常量与震级关系不明显,而与震中距基本上成反比。变差的震例较少,暂不分析。

Using difference,subordinate function and variogram methods in Mapseis soft to analyze the anomaly of water level in New No.20 well,the result shows,（1） the abnormal configuration is high value anomaly;（2） the missed event ratio of difference and variogram is high for the MS≥5 earthquakes in the near region;once the abnormities appear,there will be corresponding earthquakes occurring;the reflection ratio is 66.7% for the subordinate function in the near region and 71.4% for the MS≥7 in the far region;（3）it is positive relation between maximum abnormal range and magnitude for difference,but it is reverse relation between maximum abnormal range and epicenter distance for difference;though there is inconspicuous relation between maximum abnormal range and magnitude for subordinate function,it is reverse relation between maximum abnormal range and epicenter distance;the earthquake cases is less for variogram,so it is not analyzed in this paper.