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Investigation of crustal structure by the analysis of reverberation periodicities

ER 181 DU CNRS LABORATOIRE DE SISMOLOGIE GLOBALE INSTITUT DE PHYSIQUE DU GLOBE, 5 RUE RENÉ DESCARTES, 67084 STRASBOURG CEDEX, France

Abstract

The analysis of reverberation periodicities is shown to be a promising method to study local crustal structure. It is demonstrated with the help of numerical models, that for an average crust; a data length of only 8 to 12 sec is sufficient to derive a crustal model in contrast to about 40 sec or more needed in the Phinney's spectral ratio matching technique.

Examples from numerical models of one- and two-layer crusts are presented. Analysis of five intermediate and deep focus earthquakes, recorded on magnetic tape at the Echery (ECH) observatory of the Institut de Physique du Globe of Strasbourg, shows that while the spectral ratios indicate little overall coherence, the periodicity corresponding to the total crustal thickness is evident in all cases. The possibility of deriving a detailed crustal model is also discussed with the help of results from one of the above events.