Luis Ramón Cázares Sánchez

Universidad Nacional Autónoma de México

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

D. Hatzfeld

Université Joseph Fourier

Francisco J. Chávez‐García

Universidad Nacional Autónoma de México

Cooperative Institutions

Laboratoire des Écoulements Géophysiques et Industriels

Institut de Recherche Interdisciplinaire de Grenoble

Université Joseph Fourier

Centre National de la Recherche Scientifique

Institut des Sciences de la Terre

Université Gustave Eiffel

Université Grenoble Alpes

Maison des Sciences de l'Homme

Institut Fourier

Helwan University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Topographic site effects and HVSR. A comparison between observations and theory

Bulletin of the Seismological Society of America (1996)

Francisco J. Chávez‐García Luis Ramón Cázares Sánchez D. Hatzfeld

Abstract We present a comparison between observed and predicted amplification on a topographic feature. Our data come from an ad hoc experiment carried out during the summer of 1989, in Epire (Northern Greece). Ten digital, autonomous, three-component stations recorded a total of 68 small earthquakes. As these data were inadequate to compute empirical transfer functions using the standard spectral ratio (SSR) technique, we explored the possible use of horizontal-to-vertical spectral ratios (HVSR). First, we compare HVSR computed from theoretical transfer functions for incident P, SV, and Rayleigh waves with the horizontal transfer function for each incidence type. Second, we compute HVSR for our weak-motion data set and show that the results are stable, with a scatter not larger than that usually accepted in SSR studies. We observe significant differences between N-S and E-W motion. When we compare HVSR with theoretical transfer functions, we obtain a better agreement for SV motion than for SH motion. Amplification levels are similar between HVSR and predicted amplification, even for the SH case. This suggests that discrepancies that have been signaled for the topographic amplification between observations and predictions could be due to site effects being present in the reference station used to computed SSR. Our results support the use of HVSR to determine topographic site effects. Thus, HVSR may have a large potential to evaluate site effects in a wider variety of geological conditions than previously thought, without the shortcomings of SSR. Finally, we show that HVSR computed from noise recordings gives a reasonable estimate of HVSR computed from weak-motion data. Although this conclusion should be better substantiated, our preliminary results are encouraging.

Microtremor

Harmonic

10.1785/bssa0860051559

Cite

Citations (126)