黑龙江省地电阻率台网数据在预报工作中的应用

THE ANALYSIS AND PREDICTION OF GEOELECTRIC RESISTIVITY OBSERVATION NETWORK DATA IN HEILONGJIANG PROVINCE

对黑龙江省地电阻率台网近些年的观测资料进行了整理分析,对台网的两个地电阻率台观测资料进行了评估,发现林甸台地电阻率数据受各种干扰非常严重,无法提取震兆信息,而绥化台的观测数据质量较高,映震效能较好。绥化地震台地电阻率观测曲线具有规则年周期变化特征,以此为依据进行各向异性的前兆异常特征的研究,发现利用原始曲线法和归一化月速率方法,在中强地震前震区一定区域内的电阻率各向异性值(S)会出现上升型或下降型异常变化。分析认为速率法对于提取短临异常,判断发震时间较为理想。

This paper analyze the geoelectric ratio observation data of Heilongjiang Province in recent years, two geoelectric observation data on their station network is evaluated, found Lindian geoelectric their data is very serious interferences, not extracting precursory information, and the observation data of Suihua station of high quality, high earthquake. Change characteristic of annual cycle in Suihua seismic station observation curve with their long trend change and rule, is studied, the characteristics of precursory anomaly anisotropic discovery： before mid strong earthquakes in earthquake area, resistivity anisotropy in a certain region （S value） will appear on the rise Or decrease abnormal changes, then by last year, excluding annual cycle, to tilt, dynamic distance assessment and normalized monthly rate method, analysis method for the extraction rate, analysis of short impending anomaly, judge the occurrence time is better.