SEGJ Technical Conference

Estimation of velocity structure of deep sedimentary layers around Onikobe region using a wave form inversion of S-wave in earthquake records and Microtremor survey data.

Abstract We applied a joint inversion method for estimation of a 1D S-wave velocity structure of deep sedimentary layers using S-wave parts of earthquake records and phase velocity of microtremor in the Onikobe area. Genetic algorithm is used in inversion to find an optional model that has the minimum misfit between observed and synthetic data. As the results of joint inversion, the thickness of the layer S-wave velocity about 0.5km/s is about 0.8km in the center of Onikobe cardera and 0.5km at K-NET observation point.