Project Title/ID Number Supplemental USGS Work for NGA Project—1L10
Start/End Dates 11/18/03 – 6/30/04
Project Leader Paul Spudich (USGS/O)
Team Members Jack Boatright (USGS/O), Rufus Catchings (USGS/O), Walter Mooney (USGS/O), Christopher Stephens (USGS/O), Shane Detweiler (USGS/O), Clare Steedman (USGS/O), Mark Goldman (USGS/O), Luke Blair (USGS/O), Linda Seekins (USGS/O), Fabio Perosi (USGS/O)

F=faculty; GS=graduate student; US=undergraduate student; PD=post-doc; I=industrial collaborator; O=other

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1. Project Goals/Objectives:

  1. Development of improved functional forms for directivity, based on isochrones theory that can be used by NGA attenuation relation developers in their new attenuation models.
  2. Depths and uncertainties to 1.0 and 2.5 km/s S-wave velocities for all stations within the Bay Area and northern California that contribute strong motion recordings to the PEER/NGA database.
  3. Processed accelerograms for 56 USGS 3-component records.

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2. Role of this project in supporting PEER’s mission (vision):

This project contributes directly to the strong-motion data (C.) and meta-data (B.) in the PEER/NGA database, and to the development of physically appropriate attenuation relations (A.) for the regressions that form the heart of NGA.

3. Methodology Employed:

4. Brief Description of past year’s accomplishments (Year 6) & more detail on expected Year 7 accomplishments:

Achieved Milestones:

Achieved Milestones:

5. Other Similar Work Being Conducted Within and Outside PEER and How This Project Differs:

The velocity model in the Bay Area lags greatly behind similar work being done in southern California.

6. Plans for Year 8 if project is expected to be continued:

None. Project will sunset this year.

7. Describe any actual instances where you are aware your results have been used in industry:

Results are too new.

8. Expected Milestones & Deliverables:

The main deliverable will be a report presenting and justifying the improved functional form for directivity. Remaining milestones are:

The critical deliverable for Task B is a table with the depths and uncertainties to the 1.0 and 2.5 km/s S-wave velocity for the stations in northern California that recorded earthquakes that are part of the PEER/NGA database. Remaining milestones are:

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