ESTIMATION OF NEAR-SOURCE STRONG GROUND MOTION FROM LARGE SUBDUCTION ZONE EARTHQUAKE

Abstract

Because there is effectively no strong motion records in the near-source region of a huge subduction-zone earthquake, much of its characteristics remains unknown. In this article, near-source strong ground motions from the scenario Tokai earthquake are evaluated using empirical site-dependent amplification and phase characteristics. The site amplification factors are obtained using spectral inversion technique. Records from a M_J5.3 earthquake are used to verify the method used. The estimated near-source strong ground motions for the scenario Tokai earthquake are quite site dependent and, at some locations, even stronger than the near-source records from the 1995 Hyogo-ken Nanbu earthquake.