Mexico earthquake of September 19, 1985 - a study of amplification of seismic waves in the valley of Mexico with respect to a hill zone site
Por:
Singh S.K., Lermo J., Dominguez T., Ordaz M., Espinosa J.M., Mena E., Quaas R.
Publicada:
1 ene 1988
Resumen:
Since the installation of an extensive digital strong motion array by Fundacion Javier Barros Sierra in 1987 three moderate earthquakes have been recorded by the array and by the accelerographs operated by Instituto de Ingenieria at the National University of Mexico. Using these new data and results from the analysis of previous accelerograms, the authors present spectral ratios at 40 sites in the valley of Mexico with respect to a hill site in Ciudad Universitaria. Clear evidence for nonlinear behavior of the clay is found at Central de Abastos Oficina site during the great Michaocan earthquake (Ms=8.1). At four other lake bed sites this behavior is not seen, either because none occurred or because of poorer quality of data. The spectral ratio at a given site appears to be roughly independent of magnitude (except, perhaps, during great earthquakes when lake bed sites may have behave nonlinearly), azimuth, and depth of earthquakes with epicenters ?200 km from the city.
Filiaciones:
Singh S.K.:
UNAM, Mexico
Lermo J.:
UNAM, Mexico
Dominguez T.:
UNAM, Mexico
Ordaz M.:
UNAM, Mexico
Espinosa J.M.:
UNAM, Mexico
Mena E.:
UNAM, Mexico
Quaas R.:
UNAM, Mexico
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