Surface faulting earthquake clustering controlled by fault and shear-zone interactions.

ABSTRACT: Surface faulting earthquakes are known to cluster in time from historical and palaeoseismic studies, but the mechanism(s) responsible for clustering, such as fault interaction, strain-storage, and evolving dynamic topography, are poorly quantified, and hence not well understood. We present a quantified replication of observed earthquake clustering in central Italy. Six active normal faults are studied using ³⁶Cl cosmogenic dating, revealing out-of-phase periods of high or low surface slip-rate on neighboring structures that we interpret as earthquake clusters and anticlusters. Our calculations link stress transfer caused by slip averaged over clusters and anti-clusters on coupled fault/shear-zone structures to viscous flow laws. We show that (1) differential stress fluctuates du

SUBMITTER: Mildon ZK 

PROVIDER: S-EPMC9681762 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature