F=faculty; GS=graduate student; US=undergraduate student; PD=post-doc; I=industrial collaborator; O=other
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Review of the NGA database including earthquake source parameters, station distance and directivity parameters, orientation of recorded components, and station locations and other items as may be deemed pertinent. Addition to the database of depth to Vs isosurfaces; basin outlines at the ground surface; other basin parameters that more fully describe the geometric relation of source, basin, and site; and a flag indicating shallow vs. deep asperities of fault models. Calculate residuals of 3D basin simulations with respect to the Abrahamson and Silva (1997) model.
The NGA attenuation relations will be used widely in engineering practice to develop seismic design criteria.
Review of literature and both the URS and the COSMOS strong motion databases and calculation of parameters as needed.
To date we have reviewed the magnitudes of major earthquakes in the database and documented references used. Finite fault models have been checked in detail for 9 complex earthquakes and, to a less detailed extent, for 19 others, and results entered in the database. Correctness of the calculation of closest distance and component orientation has been checked. Basin depth information has been added to the flat file.
This work supports the data base development being done by Pacific Engineering and Analysis.
When completed, the NGA ground motion models will be used widely in industry.
Review of the database will be completed by April 16, 2004.