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乌鲁木齐4号井自1977年4月开始观测以来在观测点200公里范围内共发生4—6级地震二十次,其中大于5级的地震五次。在这些中强地震发生前,4号井的地下水位显示出不同程度的短期异常变化。实践证明该井是乌鲁木齐地区地下水反映地震的敏感点之一。
A total of M6.6 earthquakes occurred within 200 km of the observation point since Urumqi No.4 well began its observation in April 1977. Among them, more than 5 earthquakes occurred five times. Before these moderate earthquakes occurred, the water table of No.4 well showed different degrees of short-term anomalous changes. Practice has proved that the well is one of the sensitive points reflecting groundwater in Urumqi area.