ANALYSIS ON EARTH TIDAL FACTOR LOAD-UNLOAD RESPONSE RATIO ANOMALY OF WATER LEVEL IN NINGJIN WELL

Using the method of load-unload response ratio, the observation data of water level in Ningjin well are processed, the result shows that there is load-unload response ratio anomaly before Xingtai M4.8 earthquake, the method can be used as a basis method in the medium and short term earthquake prediction in Xingtai and its surrounding area.