Abstract

As one of the most seismically active regions in China, the Sichuan–Yunnan area is dominated by active faults and frequent strong earthquakes. Unexpected large earthquakes occurring in this area have caused substantial damage and casualties, necessitating comprehensive analysis of the reoccurrence patterns of strong earthquakes. This analysis was conducted using historical and instrumental earthquake records, and paleoearthquake data. Strong earthquakes occurring in the fault zones did not follow the characteristic earthquake distribution but instead migrated among the fault zones of one active block, resembling typical continental earthquake characteristics. Thus, it would be more appropriate to discuss the reoccurrence of earthquakes for an entire active block rather than a single fault. These results might help in improving reoccurrence models in probabilistic seismic hazard assessments.

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