景泰地震前宁夏干盐池井和王民井水位的异常变化分析

分析了甘肃景泰1990年6．2级地震和2000年5．9级地震前，宁夏南部干盐池井和王民井水位的变化情况。发现在景泰地震前上述2口井水位变化既有趋势异常显示也有中短期异常显示。干盐池井水位的中短期异常表现为打破年变规律，而王民井水位则出现了明显的下降变化。2口井水位的异常变化同步，而且具有重复性特征。

ANALYSIS ON ANOMALOUS VARIATIONS OF WATER LEVEL OF GANYANCHI AND WANGMIN WELLS IN SOUTHERN NINGXIA BEFORE THE JINGTAI EARTHQUAKES

Anomalous variations of water level of Ganyanchi and Wangmin wells in southern Ningxia before the Jingtai M S6.2 (1990) and M S5.9 (2000) earthquakes in Gansu are analyzed.It is found that the variations of the two wells have shows of trend and medium term or short term anomalies before the two earthquakes.The medium term or short term anomalies of Ganyanchi well show that regularity of annual variation of the water level is broken and the anomalies of Wangmin well show that water level dropped evidently. The anomalies of the two wells are synchronous with the repetitive feature.