ANALYSIS ON THE INTERACTION BETWEEN THE FOCAL FAULT OF HONGTONG AND LINFEN EARTHQUAKE AND ITS EARTHQUAKE TENDENCY

In 1303 and 1695, two near strong earthquakes occurred at Hongtong(M8) and Linfen(M7 3/4) in Linfen area of Shanxi Province, where small earthquakes have been continually occurring till now.Through analysis on the distribution of 1670 medium and small earthquakes and 149 focal mechanisms, we concluded that the strong interaction between Hongtong and Linfen earthquakes is deblocking, which caused Linfen earthquake occurred early.Moreover, there was a kind of weak interaction between the two earthquakes, which got a balance with the occurrence of random earthquakes.As the regional stress accumulated had been released completely after the two large earthquakes, it is unlikely to form a new large fracture that matches the stress field.Therefore, the earthquakes in the area have been mainly medium and small ones, and there have been no over 5 earthquake for 300 years.This phenomenon will continue, and the area is safe at present.