RELATIONSHIP BETWEEN WATER LEVEL ANOMALIES IN JIN 1-1 WELL AND MODERATE EARTHQUAKE IN SHANXI-HEBEI-INNER MONGOLIA BORDER REGION

In this paper, 22 year water level data of Jin 1-1 well are processed and the relationship between water level anomalies and moderate earthquakes within 300 km of the well is studied.The result shows that the anomalies are mostly abrupt short-impending anomalies less than 80 days.Step-rising anomaly with amplitude of over 30 mm and step-dropping anomaly with amplitude of over 40 mm can be seen as seismic precursor.