We present a model for estimating horizontal ground motion amplitudes caused by shallow crustal earthquakes occurring in active tectonic environments. The model provides predictive relationships for the orientation-independent average horizontal component of ground motions. Relationships are provided for peak acceleration, peak velocity, and 5-percent damped pseudo-spectral acceleration for spectral periods of 0.01 to 10 seconds. The model represents an update of the relationships developed by Sadigh et. al. (1997) and incorporates improved magnitude and distance scaling forms as well as hanging-wall effects. Site effects are represented by smooth functions of average shear wave velocity of the upper 30 m (VS30) and sediment depth. The new model predicts median ground motion that is similar to Sadigh et. al. (1997) at short spectral period, but lower ground motions at longer periods. The new model produces slightly lower ground motions in the distance range of 10 to 50 km and larger ground motions at larger distances. The aleatory variability in ground motion amplitude was found to depend upon earthquake magnitude and on the degree of nonlinear soil response, For large magnitude earthquakes, the aleatory variability is larger than found by Sadigh et. al. (1997).
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Research Article|
February 01, 2008
An NGA Model for the Average Horizontal Component of Peak Ground Motion and Response Spectra
BrianS-J. Chiou, M.EERI;
BrianS-J. Chiou, M.EERI
a)
Division of Research and Innovation, California Department of Transportation, Sacramento, CA
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Robert R. Youngs, M.EERI
Robert R. Youngs, M.EERI
b)
Geomatrix consultants, Inc., 2101 Webster St., 12th Floor, Oakland, CA 94612
Search for other works by this author on:
BrianS-J. Chiou, M.EERI
a)
Division of Research and Innovation, California Department of Transportation, Sacramento, CA
Robert R. Youngs, M.EERI
b)
Geomatrix consultants, Inc., 2101 Webster St., 12th Floor, Oakland, CA 94612
Publisher: Earthquake Engineering Research Institute
Received:
30 Jul 2007
Accepted:
25 Jan 2008
First Online:
01 Jun 2020
Online ISSN: 1944-8201
Print ISSN: 8755-2930
© 2008 Earthquake Engineering Research Institute
Earthquake Engineering Research Institute
Earthquake Spectra (2008) 24 (1): 173–215.
Article history
Received:
30 Jul 2007
Accepted:
25 Jan 2008
First Online:
01 Jun 2020
Citation
BrianS-J. Chiou, Robert R. Youngs; An NGA Model for the Average Horizontal Component of Peak Ground Motion and Response Spectra. Earthquake Spectra 2008;; 24 (1): 173–215. doi: https://doi.org/10.1193/1.2894832
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Index Terms/Descriptors
- acceleration
- aftershocks
- amplitude
- attenuation
- bedrock
- body waves
- California
- crust
- data bases
- data processing
- depth
- earthquakes
- elastic waves
- faults
- focus
- frequency
- ground motion
- hanging wall
- long-period waves
- magnitude
- models
- neotectonics
- normal faults
- numerical models
- peak ground acceleration
- regression analysis
- reverse faults
- rupture
- S-waves
- scale factor
- sediments
- seismic waves
- shallow-focus earthquakes
- soils
- Southern California
- spectra
- spectral analysis
- statistical analysis
- strike-slip faults
- tectonics
- thickness
- topography
- United States
- velocity
- wave amplification
- peak ground velocity
- Anza earthquake 2001
- Yorba Linda earthquake 2002
- NGA Project
- Big Bear City earthquake 2003
Latitude & Longitude
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