Inferences of a layered structure from S wave spectra -Part 1. Theoretical considerations of S wave spectrum method

Abstract

A method is described to infer a layered structure from the amplitude ratio of the vertical to the horizontal component of SV waves together with the phase difference between them, and also from the corresponding relations between SH waves and the horizontal component of SV waves. The behaviors of these frequency-dependent functions for various models with different layer parameters are investigated, and their applicability to inference of the structure is discussed. It is shown that the S wave spectra will be useful to test the appropriateness of probable models derived from P wave spectra and other information, if good records from deep-focus shocks with appropriate epicentral distances are analyzed.