A three-stage scaling model of the source parameters for crustal earthquakes in Japan has previously been constructed by Irikura and Miyake (2001) and Murotani et al. (2015) based on source parameters from the results of waveform inversion with strong-motion data.
Therefore, a characterized source model was proposed that consisted of one or several asperities with large slips and a background area with less slip (Miyake et al. 2003) based on source characterizations defined using slip distributions from the waveform inversion of strong-motion data.
It also enabled us to quantify the epistemic uncertainty associated with tsunami predictions based on various source inversion models.
A systematic difference between our aftershock distribution and the fault model assumed by Yokota et al. (2009) is due to an inadequate assumption of the fault location based on preliminary source inversion of geodetic and strong motion data.
Using real-time data from the network, a source inversion analysis system called SWIFT (Nakano et al. 2008, 2010a, source parameter determination based on waveform inversion of Fourier transformed seismograms) automatically determines a CMT solution for an earthquake of moment magnitude greater than 4.5 within 15 min of the start of the earthquake.
Within the framework of an automatic/manual CMT estimation called the source-parameter determinations based on waveform inversion of Fourier Transformed seismograms (SWIFT) system (Nakano et al. 2008, 2010), the NIED has routinely analyzed the observed seismic data and maintained a database of the estimated CMTs of earthquakes that have occurred throughout the regional seismic networks.
First, a characterized source model was generated based on a source model obtained from waveform inversion analysis.
Recently, the Japanese Cabinet Office (2013) proposed a source model for the 1703 event based on an inversion analysis using the observed terrestrial crustal deformations in conjunction with historical tsunami data.
They reported that the initial postseismic displacement rapidly decayed within 20 days after the occurrence of the mainshock and suggested a nearly pure right-lateral afterslip of less than 5 cm on the shallow portion of the source fault based on inversion of postseismic displacements with the variable slip model.
This paper presents a method for compensation of disturbances introduced by near-surface interference sources in the estimation of magnetic heading, based on the inversion of the interference signal.
