Abstract
During the 2011 Tohoku earthquake, crustal deformations and tsunami time histories were observed by the GPS devices. In this investigation, inversion of the observation data for fault slip models was carried out. Here, multi time window model was employed for the source time function. Trial inversion analyses with several kinds of combination of rupture velocities and number of time windows indicates the decreasing misfit with the increasing time window numbers and slow rupture velocity. However, the duration time of fault movement under this condition is quite longer than the observed temporal response of crustal deformation. Based on the investigation, it could be said that the inversion models with the rupture velocities 2.5-3.0km/s and 5 time windows are realistic options.
