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Empirical models for surface- and body-wave amplifications of response spectra in the Bogota Basin, Colombia

Hiroyuki Miura, Taisho Okamura, Masashi Matsuoka, Mario Leal, Helber Garcia and Nelson Pulido
Empirical models for surface- and body-wave amplifications of response spectra in the Bogota Basin, Colombia
Bulletin of the Seismological Society of America (April 2019) 109 (3): 987-1004

Abstract

Empirical site amplification models for surface and body waves based on the average shear-wave velocity in the upper 30 m (VS30) are developed for predicting horizontal response spectra in the Bogota basin, Colombia. By analyzing the earthquake ground-motion data recorded in Bogota, it is found that long-period ground motions with a period of 2 s from shallow earthquakes are strongly amplified within the basin, possibly as a result of the generation of surface waves at the basin edge, whereas shorter-period body waves with predominant periods between 0.5 and 1 s typically characterize records within the basin from deep earthquakes. The present results indicate that the attenuation relationship developed by Uchiyama and Midorikawa (2006) accurately reproduces the response spectra at reference rock sites. In this study, the site amplifications, defined as the ratio between the observed response spectrum and the reference spectrum obtained from the aforementioned attenuation relationship, are evaluated. Models of the site amplifications for surface and body waves are developed using the observed response spectra in Bogota and validated by comparing the model results to observation data from the 1999 Quindio, Colombia, and 2017 Chiapas, Mexico, earthquakes. The results confirm that the surface-wave amplification model developed in this study is shown to accurately reproduce the observed response spectra in Bogota.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 109
Serial Issue: 3
Title: Empirical models for surface- and body-wave amplifications of response spectra in the Bogota Basin, Colombia
Affiliation: Hiroshima University, Department of Architecture, Hiroshima, Japan
Pages: 987-1004
Published: 20190430
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 41
Accession Number: 2019-044651
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch maps
N04°37'60" - N04°37'60", W74°04'60" - W74°04'60"
Secondary Affiliation: Tokyo Institute of Technology, JPN, JapanInstituto Distrital de Gestion de Riesgos y Cambio Climatico, COL, ColombiaServicio Geologico Colombiano, COL, ColombiaNational Research Institute for Earth Science and Disaster Resilience, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201923
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