There are two seismic zones in Weihai area. One is the Penglai-Weihai seismic belt along the northern coast of Shandong Peninsula, which extends in the northern waters of the peninsula, and the coastal topography of the northern peninsula is affected by this fault.
More than 80 years ago, Mr Weng Wenhao, a geologist, put forward the concept of "boarding subsidence zone", arguing that the northern part of the peninsula is controlled by fault structures, and crustal collapse may lead to earthquakes. Collapse is a long geological process, and there is a recorded Penglai earthquake of magnitude 7 1548 on this fault zone. After Weihai M6 earthquake 1948, there were many minor earthquakes that did not cause damage. Part of this fault zone passes through the urban area of Weihai, forming a valley between Naigu Mountain and Gumodun, and extending to Baoquantang. Baoquantang is controlled by this fault, which makes the hot water in the deep crust rise to the ground along the fault to form hot springs. In a sense, hot springs are related to earthquakes. Therefore, before the earthquake, hot springs often have earthquake precursor reactions, reminding people that there are anomalies underground and there may be earthquakes.
The other seismic belt is the Mu Ping-Rushan seismic belt, which runs in the north-south direction, along the Mu Ping-Rushan line, and the north and south ends extend to the sea. Its scale is smaller than that of the previous earthquake zone, and an earthquake of magnitude 6 occurred in Kongtong Mountain 1046. 1939 Rushan M5.5 earthquake caused different degrees of disasters. In recent years, there have been many strong earthquakes of magnitude 4 or so in this earthquake zone, which also caused slight damage to buildings and brought panic to residents.
These two seismic zones are the key parts of earthquake monitoring in this area. The intersection of the two faults is roughly in the northwest sea area of Weihai, which is an earthquake-prone area with little annual seismic activity and is also a key earthquake monitoring area.