Subarea characteristics of earthquake types in Yunnan

摘要

Studies on the earthquake sequences and the source mechanisms of the strong earthquakes show that Yunnan has more obvious subarea characteristics of earthquake type. Strike-slip seismic fault and mainshock-aftershock earthquake sequences are dominant in whole Yunnan area. Considering the ratio of non strike-slip faults and non mainshock-aftershock, Yunnan area can be divided into four subareas with different characteristics, which are strike-slip mainshock-aftershock in central Yunnan (A 1), incline-slip swarm in northwestern Yunnan (A 2), strike-slip double shocks in western Yunnan (B 1) and quasi-strike-slip mainshock-aftershock in southwestern Yunnan (B 2), respectively.