Developments of Seismic Source Process Analysis Method

Abstract

Seismic source process has been estimated using inversion of seismic waveforms and geodetic data. However, seismic source models for the same earthquake are often quite different from one another. We briefly noted on representations of the spatio-temporal slip-rate distribution, observation equation, constraints and property of near-source and tele-seismic data, and introduced two possible reasons for this discrepancy: geophysical observations are always contaminated by systematical error; observations are always insufficient to estimate a fine image of seismic source process. We are here concerned with the method for estimation of proper seismic source model from such observations. To mitigate the effect of systematic errors, it is essential to take the data covariance components into account. To obtain a fine and reasonable seismic source model from insufficient observations, it is necessary to introduce suitable prior constraints and then determine their optimal relative weights on the observed data using objective method.