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1979年3月20日8时河南省修武发生了一次4级地震。距震中12公里的N98井,震前3月13日水位突升34厘米、19日突升30厘米。当天水位固体潮波形畸变。与此同时,距震中分别为22公里的陆20—2、朱3—3井也有相应的变化。N98、陆20—2、朱3—3井等焦作深水井分布于活动断层边部,处于震中附近,震前水位突跳,是一值得注意的地震前兆。
At 1900 on March 20, 1979, a magnitude 4 earthquake occurred in Xiuwu, Henan Province. The N98 well, 12 kilometers from the epicenter, jumped 34 centimeters above the water level on March 13 before the earthquake and surged 30 centimeters on the 19th. The same day the water level solid wave waveform distortion. In the meantime, there are corresponding changes in Lu 20-2 and Zhu 3-3 wells that are respectively 22 kilometers away from the epicenter. Deep well Jiaozuo, such as N98, Lu 20-2 and Zhu 3-3 wells, is located at the edge of the active fault and is near the epicenter. The sudden jump of water level before the earthquake is a notable earthquake precursor.