DSM COMPLETE SYNTHETIC SEISMOGRAMS - SH, SPHERICALLY SYMMETRICAL, CASE

We present a new technique, based on the Direct Solution Method (DSM) [Geller et al., 1990; Hara et al., 1991; Geller and Ohminato, 1994], f or calculating SH (toroidal) synthetic seismograms for spherically sym metric, isotropic, media. No asymptotic approximations are used and th e synthetics, which fully include both body and surface waves, can be computed for a broad range of frequencies. Our algorithm accurately ha ndles sources that require discontinuities in the vertically dependent part of the displacement. We use matrix operators that minimize the n umerical error of the solutions. An example synthetic profile is prese nted for a 600km deep source in the IASP91 model for the period range 4-5000s.