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Bulletin of the Seismological Society of America; December 1997; v. 87; no. 6; p. 1667-1673
© 1997 Seismological Society of America
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Topographic site effects. A comparison of two nonreference methods

Francisco J. Chávez-García1, Miguel Rodríguez, Edward H. Field and Denis Hatzfeld

Instituto de Ingeniería UNAM, Ciudad Universitarìa, Apdo. Postal 70-472, Coyoacán, 04510 México, D.F. México
Centro de Investigación Sísmica A.C., Fundación Javier Barros Sierra, Camino al Ajusco 203, Tlalpan, 14200 México, D.F. México
Southern California Earthquake Center University of Southern California, Los Angeles, California 90007
Laboratoire de Géophysique Interne et Tectonophysique Observatoire de Grenoble, B.P. 53X, 38041 Grenoble cedex, France

Abstract

We present an experimental study of topographic site effects. The data we use come from an experiment carried out during the summer of 1989, in Epire (northern Greece). Ten digital stations recorded a total of 68 small earthquakes. A recent article (Chávez-García et al., 1996) presented a comparison between site effects determined using horizontal-to-vertical spectral ratios (HVSR) for this data set and theoretical modeling. In this note, we compare the topographic site effects determined using HVSR with another, independent, experimental estimate: a generalized inversion scheme (GIS). Neither HVSR nor GIS depend on the availability of a reference site. We obtain a very good agreement between both estimates of topographic site effects for both horizontal components. Our results support the use of HVSR to determine topographic site effects.

Footnotes

1 Present address: Politecnico di Milano, Dipartimento di Ingegneria Strutturale, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy




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