SSHAC Workshop 1 – November 15-18, 2010

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Next Generation Attenuation for CENA (NGA-East)

SSHAC Workshop 1 – Critical Issues and Data Needs

November 15-18, 2010
University of California, Berkeley

Agenda (PDF fle – 480 KB)

With funding from the US Nuclear Regulatory Commission (NRC), Electric Power Research Institute (EPRI) and US Department of Energy, the Pacific Earthquake Engineering Research Center (PEER) is coordinating a comprehensive multidisciplinary program to develop Next Generation Attenuation Relationships for the Central and Eastern North-America (NGA-East).

As part of this research program, PEER will coordinate a large number of public workshops over the life of the project. The purposes of such workshops are to collect feedback from the earthquake community and inform the participants about the on-going technical activities. NGA East is treated as a SSHAC (Senior Seismic Hazard Analysis Committee) Level 3 program. See the Open-File Report 2009-1093 (PDF file – 992 KB) for a summary of the SSHAC process.

This is the first of several SSHAC Workshops. The purpose of the workshop is to:

  1. Identify the technical issues of highest significance to the hazard analysis, and
  2. Review the available data and identify the data, information and/or additional work that will be needed to address those issues.

Workshop Attendance

Over 70 participants attended the workshop free of charge at the Berkeley International House. International House Visitor information (Location, Maps, Parking, Public transportation, airport links, etc.). Nearly 25 participants attended virtually via PEER’s live video conferencing service, where participants could watch the presentations on their personal computer while hearing the presenter and discussion period via telephone. This virtual service was provided free of charge to attendees participating from both international and US locations.

Videos and PDFs for the all presentations

Monday, November 15

All documents below are in PDF format.

November 15, 2010 (9:00-12:00) Project plan & critical issues

9:00-10:00 NGA-East project plan, and the SSHAC process (1.Yousef Bozorgnia, 2.Christine Goulet)
10:00-10:15 Sponsors perspective (3.Annie Kammerer, 4.Steve McDuffie, 5.Larry Salomone)
10:15-10:30 Discussion
10:30-10:45 Break
10:45-11:15 Critical issues and interfaces (6.Norman Abrahamson)
11:15-12:00 Discussion
12:00-1:00 Lunch

November 15, 2010 (1:00-4:30) Review of the preliminary database of recorded ground motions from Central East North America, and small magnitude data from California

1:00 -2:45 Presentations on the database (1.Chuck Mueller/Chris Cramer, 2.Jon Adams, 3.Bob Herrmann, 4.Gabe Toro, 5.Trevor Allen, 6.Bob Darragh; Database WG)
2:45-3:00 Break
3:00-4:00 Discussion: How are we going to use the data? Is the database exhaustive?
4:00-4:30 Summary of today’s key issues (7.Christine Goulet)
4:30-5:00 Observers (Sponsors and Public) Comments
5:00-5:30 PPRP-TI and JMC Debriefing (closed door meeting)



Tuesday, November 16

November 16, 2010 (9:00-11:00) Discussion of reference rock definition and issues related to Kappa by the Geotechnical Working Group

9:00-9:30 Presentation on selected reference rock and issues (1.Youssef Hashash; Geotech WG)
9:30-10:00 Discussion
10:00-10:30 Kappa: state of knowledge and available data for the CEUS (2.Youssef Hashash; Geotech WG)
10:30-11:00 Discussion
11:00-11:15 Break

November 16, 2010 (11:15-12:15, 1:00-2:00) Issues for point source models

11:15-11:45 Models considered and past validation studies (3.Bob Darragh/Walt Silva; Sim WG)
11:45-12:15 Discussion
12:15-1:00 Lunch
1:00-1:30 Issues with point source models (large magnitude, single Vs. double corner, short T Vs. long, etc.) (1.Bob Darragh/Walt Silva; Sim WG)
1:30-2:00 Discussion

November 16, 2010 (2:00-4:30) Methods for finite fault simulations

2:00-3:00 Methods considered: description of selected methods (2.Yuehua Zeng; Sim WG)
3:00-3:30 Discussion
3:30-3:45 Break
3:45-4:00 Discussion: Capture of representative methods
4:00-4:30 Summary of today’s key issues (3.Norman Abrahamson)
4:30-5:00 Observers (Sponsors and Public) Comments
5:00-5:30 PPRP-TI and JMC Debriefing (closed door meeting)



Wednesday, November 17

November 17, 2010 (9:00-11:00) Range of crustal property inputs for finite fault simulations

9:00-10:00 Alternative regionalization and crustal structures 1D and Q for FF simulations (1.Martin Chapman; Path WG)
10:00-10:45 Discussion
10:45-11:00 Break

November 17, 2010 (11:00-12:15) Range of inputs of geometrical spreading and Q for point source simulations

11:00-11:45 Alternative regionalization, geometrical spreading, Kappa and Q for PS simulations; with focus on alternative geometrical spreading in first 40km (2.Martin Chapman, 3.Jack Boatwright; Path WG)
11:45-12:15 Discussion
12:15-1:00 Lunch

November 17, 2010 (1:00-4:30) Range of input stress drops for point source simulations

1:00-2:30 Stress drop ranges from past SCR earthquakes, issue in Saguenay earthquake and magnitude-dependent or constant (1.Gail Atkinson, 2.Bob Darragh/Walt Silva, 3.Annemarie Baltay/Greg Beroza; Sim WG) – What range is needed for the simulations to cover all alternative models?
2:30-3:00 Issue of correlation of parameter (e.g. stress drop, geometrical spreading and Kappa): results from past studies (4.Dave Boore/Ken Campbell; Path and Geotech WGs)
3:00-3:15 Break
3:15-4:00 Discussion: do these values to be used in the simulations capture the range to consider? What additional work should be done regarding the correlation of parameters?
4:00-4:30 Summary of today’s key issues (5.Norman Abrahamson)
4:30-5:00 Observers (Sponsors and Public) Comments
5:00-5:30 PPRP-TI and JMC Debriefing (closed door meeting)



Thursday, November 18

November 18, 2010 (9:00-12:00) Selection of alternative methods of generating finite source inputs

9:00-9:45 Dynamic rupture approach (Ralph Archuleta (No slides); Sim WG) Inputs to dynamic rupture models – SCEC 100 runs project (1.Ruth Harris, 2.Norman Abrahamson) Kinematic source inputs from dynamic rupture models (3.Ralph Archuleta)
9:45-10:30 Discussion
10:30-10:45 Break
10:45-11:30 Summary of currently available kinematic rupture generators (4.Robert Graves)
11:30-12:00 Discussion: is the list exhaustive?
12:00-1:00 Lunch

November 18, 2010 (1:00-3:00) Sigma Working Group

1:00-2:00 Summary of the Sigma WG plan (1.Linda Al Atik; Sigma WG)
2:00-3:00 Discussion: have we captured all the alternatives?
3:00-3:15 Break

November 18, 2010 (3:15-4:00) Vertical ground motion

3:15-3:40 Vertical ground motion: plan and data needs (2.Sanaz Rezaeian; Vertical WG)
3:40-4:10 Finite fault validation plan and discussion of capture of representative methods (3.Ralph Archuleta; Sim WG)

November 18, 2010 (4:00-4:30) Identification of other critical Issues and data needs

4:10-4:30 Summary of today’s key issues (4.Christine Goulet)
4:30-5:00 Observers (Sponsors and Public) Comments
5:00-5:10 Week summary overview (5.Christine Goulet), closing remarks (Yousef Bozorgnia)
5:10-onward PPRP-TI and JMC Debriefing (closed door meeting)



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