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Prediction of spectral acceleration response ordinates based on PGA attenuation

Earthquake Spectra

By:
and
DOI: 10.1193/1.3043904

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Abstract

Developed herein is a new peak ground acceleration (PGA)-based predictive model for 5% damped pseudospectral acceleration (SA) ordinates of free-field horizontal component of ground motion from shallow-crustal earthquakes. The predictive model of ground motion spectral shape (i.e., normalized spectrum) is generated as a continuous function of few parameters. The proposed model eliminates the classical exhausted matrix of estimator coefficients, and provides significant ease in its implementation. It is structured on the Next Generation Attenuation (NGA) database with a number of additions from recent Californian events including 2003 San Simeon and 2004 Parkfield earthquakes. A unique feature of the model is its new functional form explicitly integrating PGA as a scaling factor. The spectral shape model is parameterized within an approximation function using moment magnitude, closest distance to the fault (fault distance) and VS30 (average shear-wave velocity in the upper 30 m) as independent variables. Mean values of its estimator coefficients were computed by fitting an approximation function to spectral shape of each record using robust nonlinear optimization. Proposed spectral shape model is independent of the PGA attenuation, allowing utilization of various PGA attenuation relations to estimate the response spectrum of earthquake recordings.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Prediction of spectral acceleration response ordinates based on PGA attenuation
Series title:
Earthquake Spectra
DOI:
10.1193/1.3043904
Volume
25
Issue:
1
Year Published:
2009
Language:
English
Publisher:
Earthquake Engineering Research Institute
Publisher location:
Oakland, CA
Contributing office(s):
Earthquake Science Center
Description:
31 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earthquake Spectra
First page:
39
Last page:
69