The NGA-West2 site database (SDB) contains information on site condition and instrument housing for 4,147 strong-motion stations with recordings in the project flatfile. The stations are from active tectonic regions, mainly in California, Japan, Taiwan, China, and the Mediterranean area. The principal site parameter is the time-averaged shear wave velocity in the upper 30 m (VS30), which we characterize using measurements where available (2,013 stations) and proxy-based relationships otherwise. We also provide basin depths from published models for 2,761 sites mostly in California and Japan. We improved the documentation and consistency of site descriptors used as proxies for VS30 estimation (surface geology, ground slope, and geotechnical or geomorphic categories) and analyzed proxy performance relative to VS30 values from measurements. We present protocols for VS30 estimation from proxies that emphasize methods minimizing bias and dispersion relative to data. For each site, we provide the preferred VS30 and its dispersion.
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Research Article|
August 01, 2014
NGA-West2 Site Database
Emel Seyhan, M. EERI;
Emel Seyhan, M. EERI
a
University of California, Los Angeles, Civil & Environmental Engineering Dept., Los Angeles, CA
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Jonathan P. Stewart, M. EERI;
Jonathan P. Stewart, M. EERI
a
University of California, Los Angeles, Civil & Environmental Engineering Dept., Los Angeles, CA
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Timothy D. Ancheta, M. EERI;
Timothy D. Ancheta, M. EERI
b
Risk Management Solutions, Newark, CA (formerly UCLA Civil & Environmental Engineering)
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Robert B. Darragh, M. EERI;
Robert B. Darragh, M. EERI
c
Pacific Engineering and Analysis, El Cerrito, CA
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Robert W. Graves, M. EERI
Robert W. Graves, M. EERI
d
U.S. Geological Survey, Pasadena, CA
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Emel Seyhan, M. EERI
a
University of California, Los Angeles, Civil & Environmental Engineering Dept., Los Angeles, CA
Jonathan P. Stewart, M. EERI
a
University of California, Los Angeles, Civil & Environmental Engineering Dept., Los Angeles, CA
Timothy D. Ancheta, M. EERI
b
Risk Management Solutions, Newark, CA (formerly UCLA Civil & Environmental Engineering)
Robert B. Darragh, M. EERI
c
Pacific Engineering and Analysis, El Cerrito, CA
Robert W. Graves, M. EERI
d
U.S. Geological Survey, Pasadena, CA
Publisher: Earthquake Engineering Research Institute
Received:
29 Jun 2013
Accepted:
26 Feb 2014
First Online:
01 Jun 2020
Online ISSN: 1944-8201
Print ISSN: 8755-2930
© 2014 Earthquake Engineering Research Institute
Earthquake Engineering Research Institute
Earthquake Spectra (2014) 30 (3): 1007–1024.
Article history
Received:
29 Jun 2013
Accepted:
26 Feb 2014
First Online:
01 Jun 2020
Citation
Emel Seyhan, Jonathan P. Stewart, Timothy D. Ancheta, Robert B. Darragh, Robert W. Graves; NGA-West2 Site Database. Earthquake Spectra 2014;; 30 (3): 1007–1024. doi: https://doi.org/10.1193/062913EQS180M
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Index Terms/Descriptors
- Asia
- basins
- body waves
- building codes
- buildings
- California
- data bases
- data processing
- depth
- earthquakes
- elastic waves
- engineering properties
- Far East
- ground motion
- guided waves
- histograms
- instruments
- Japan
- Northern California
- S-waves
- seismic waves
- Southern California
- statistical analysis
- structures
- surface waves
- uncertainty
- United States
- velocity
- velocity analysis
- NGA-West2 project
Latitude & Longitude
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