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Empirical model for estimating Fourier amplitude spectra of ground acceleration in Taiwan region
Author(s) -
Sokolov Vladimir,
Loh ChinHsiung,
Wen KuoLiang
Publication year - 2000
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/(sici)1096-9845(200003)29:3<339::aid-eqe908>3.0.co;2-r
Subject(s) - attenuation , seismology , peak ground acceleration , scaling , magnitude (astronomy) , amplitude , acceleration , moment magnitude scale , spectral acceleration , strong ground motion , geology , seismic hazard , geodesy , seismic moment , range (aeronautics) , ground motion , physics , geometry , mathematics , engineering , optics , classical mechanics , astronomy , fault (geology) , aerospace engineering
A collection of ground‐motion recordings (1070 acceleration records) of moderate (5.1⩽ M L ⩽6.5) earthquakes obtained during the execution of the Taiwan Strong Motion Instrumentation Program (TSMIP) since 1991 was used to study source scaling model and attenuation relations for a wide range of earthquake magnitudes and distances and to verify the models developed recently for the Taiwan region. The results of the analysis reveal that the acceleration spectra of the most significant part of the records, starting from S‐wave arrival, can be modelled accurately using the Brune's ω ‐squared source model with magnitude‐dependent stress parameter Δ σ , that should be determined using the recently proposed regional relationships between magnitude ( M L ) and seismic moment ( M 0 ) and between M 0 and Δ σ . The anelastic attenuation Q of spectral amplitudes with distance may be described as Q =225 ƒ 1.1 both for deep (depth more than 35 km) and shallow earthquakes. The source scaling and attenuation models allow a satisfactory prediction of the peak ground acceleration for magnitudes 5.1⩽M⩽6.5 and distances up to about 200 km in the Taiwan region, and may be useful for seismic hazard assessment. Copyright © 2000 John Wiley & Sons, Ltd.