Estimation of S-wave velocity structure of deep soils using waveform inversion for S-wave part of earthquake ground motion from small event

摘要

We propose an inversion method for estimation of a 1D S-wave velocity structure of deep sedimentary layers using S-wave parts of earthquake records for evaluating site amplification. Genetic algorithm is used in inversion to find an optional model that has the minimum misfit between observed and calculated S-waves. We conducted numerical experiments using synthetic data. We applied our method to actual data at Narita in the Kanto basin and at stations around Lake Biwa. Effectiveness of the proposed methods were confirmed in the numerical experiments and actual applications