甘孜地震台水氡观测资料的干扰识别和短临异常分析

系统整理了甘孜地震台自有水氡观测以来的数据,分析了观测数据中的各种干扰因素,并研究了在该台200 km范围内的5级以上地震、300 km内的6级以上地震前水氡的短临异常特征.结果表明.1974年以来甘孜水氡多次出现中短期异常变化,异常具有破年变、相关关系改变等特点,水氡异常的产生与水温、流量因素有关,更与岩石应力-应变、地壳构造活动等有关.短临异常出现的时间大多集中在1个月内,异常形态以突升、突降为主,异常变化的幅度在10%以上,异常幅度的大小与地震震级的大小并无明显的相关性.

Interfering Recognizing and Short-imminent Anomaly Analysis with the Observatory Data of Radon in Groundwater in Ganzi Seismic Station

The observatory data of the radon in groundwater in Ganzi Seismic Station since the station was built up is systematically processed and the several interfering factors are analyzed. We have studied the characteristics of the connections among the radon changes in groundwater and the earthquakes above M5.0 occurred within the distance of 200km, and M6. 0 within 300km around the seismic station. Our results show that since 1974 when the observatory data were recorded, the radon contents in groundwater presented anomaly changes of mid-short term for several times. These anomalies have features of breaking the annual changes and changing the correlation coefficient. The anomaly changes of radon content in groundwater are related to the temperature, the flow of groundwater, and the changes of rock stress-strain and the crust activity. The time of most short-imminent anomalies is concentrated within 1 month, the anomaly forms show sudden increase and decrease, and the amplitude is above 10%. There is no obvious correlation between the anomaly amplitude and the magnitude.