五里营综合观测井地下流体震前异常特征初步研究

五里营综合观测井自１９８４年观测至今，已积累了１５年连续、可靠的资料。经过多次地震检验，该井水位、水氡、水汞等地下流体震前异常反应明显。利用该井特征性的异常形态，如脉冲、升降、方波等前兆变化对大同－阳高、张北－尚义强震及几次邻近地区４．０级以上地震曾多次作出了较好的预测。

Preliminary Studies on the Anomalies of the Subsurface Fluids in Wuliying Comprehensive Observation Well before Earthquakes

Since 1984, the continuous and reliable data from W uliying com prehensive obser- vation w ellhave been collected forfifteen years.According to testes by m any earthquakes,the ob- vious anom alies ofthe subsurface fluids, such as w ater level, radon and m ercury are observed be- fore earthquakes. Based on the anom alous changes in the w ell, such as the precursor changes of pulse, raise and dow n of the w ater level, and square w ave, the strong earthquakes of Datong- Yanggao and Zhangbei-Shangyi, as w ellas som e M > 4.0 earthquakes occurring nearby the w ell w ere w ellpredicted.