Seismic moment estimation of small earthquakes by waveform fitting

We developed an X-window program for estimating seismic moments and fault parameters of small earthquakes by waveform fitting. The graphical interface was adopted for operational convenience in routine processing. Manual parameter searching was implemented in the tool as well as waveform inversion. Body wave data recorded at stations within 100 kilometers of hypocenters are compared with synthetic records. Frequency components slightly lower than the corner frequency are used to estimate source parameters. Time for calculating synthetic records was reduced by preparing Green's functions beforehand. Source parameters were estimated by the tool for the earthquakes of Mw from 3.5 to 6.1 in the southern Kanto area.