Modeling of Surface Fault Occurrence Rate for Inland Crustal Earthquakes in Japan

Abstract

When the fault area spreads within the seismogenic layer, earthquake faults appear on ground surface. Quantifying the magnitude of earthquakes at which surface faults appear is an important issue for strong ground motion prediction. We quantified the occurrence rate of surface faults against both JMA magnitude and Moment magnitude by the model function derived from the newly constructed data by combining Takemura (1998) and recent earthquakes. The occurrence rates of surface faults for large earthquakes for which there is little data were supplemented by overseas earthquakes and theoretical studies using characterized source models.