A method to estimate fault model of slow slip event using strainmeters of the integrated groundwater observation well network for earthquake prediction of the Geological Survey of Japan, AIST

Abstract

A method to estimate fault parameters due to slow slip event was developed and tested. The method is based on a grid search to find the fault that minimizes the residual between the calculated and observed strain at strainmeter stations. According to a simulation study, it is shown that the method can retrieve the given fault parameters for the case of homogeneous fault slip while the extent of fault is underestimated and the slip amount is overestimated for inhomogeneous slip distribution cases. However, the area where the slip is relatively large and the moment magnitude of the slow slip event are well retrieved.