CAJ | 학술논문

By analyzing the relationship between ground water behavior and strong seismic activity during the past more than20 years in North China, we have found similar water level descending variation of a part of wells in theshort-term stage before several strong earthquakes. The characteristics of anomaly are: at the beginning, waterlevel dropped abruptly or accelerated to drop; then it turned to slow rising with a smaller amplitude than that ofdescending; earthquakes occurred during the slow-rising process of water level, and at that time or beforeearthquake occurrence, water level rose with a large amplitude. Among more than 100 wells in North China, thedescending anomalies were not recorded for many times, but similar variation processes of water level were notedat different wells before several strong earthquakes, which proves that seismic precursory anomalies of groundwater are of certain recurrence features, occurring repeatedly before different strong earthquakes. Therefore, it isnecessary to study the genesis of this type of anomaly and its relationship with strong seismic activity.