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SCEC UGMS Committee Meeting

Conveners: C.B. Crouse and Tom Jordan
Dates: May 16, 2016 (10:00 - 15:00)
Location: SCEC Boardroom, USC, Los Angeles

SUMMARY: The SCEC Committee for Utilization of Ground Motion Simulations (or "UGMS Committee") is tasked to develop long-period response spectral acceleration maps for Los Angeles region for inclusion in NEHRP and ASCE 7 Seismic Provisions and in Los Angeles City Building Code. The maps would be based on 3-D numerical ground-motion simulations, and ground motions computed using latest empirical ground-motion prediction equations from the PEER NGA project. This project is coordinated with (1) the SCEC Ground Motion Simulation Validation Technical Activity Group (GMSV-TAG), (2) other SCEC projects, such as CyberShake and UCERF, and (3) the USGS national seismic hazard mapping project.

Presentation slides may be downloaded by clicking the links following the title. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.

Monday, May 16, 2016

10:00 - 10:15 Welcome, Attendee Introductions, and Agenda Review C.B. Crouse
10:15 - 10:30 Review of Results from November 2015 Meeting (PPT, 9.0MB) C.B. Crouse
10:30 - 11:30 Review of Revised Risk-Targeted Maximum Considered Earthquake Response Spectra (MCER) at 50 Additional Southern California Sites (T = 2 – 10 sec) (PDF, 857KB)  Kevin Milner / Scott Callaghan
11:30 - 12:00 Review of Hazard and MCER Deaggregation Results and Representative Simulated Seismograms from CyberShake at Selected Sites (Sample Plots) Kevin Milner / Scott Callaghan
12:00 - 13:00 Lunch  
13:00 - 13:15 Results of Revision to Site-Response Analysis at Carson Site (s429) (PPT, 13.1MB) Domniki Asimaki
13:15 - 14:00 Proposal to Construct MCER Response Spectra and Review of Resulting MCER at 64 (14 original + 50 new) Southern California Sites C.B. Crouse
14:00 - 14:15 Approach to Develop MCER for Arbitrary Vs30 (for use as input/outcrop motion for optional
site-response analyses)
C.B. Crouse / Marty Hudson
14:15 - 14:30 Development of MCER Look-Up Tool (Plan, Contents, & Schedule) Christine Goulet / C.B. Crouse
14:30 - 14:45 Promotion of MCER Maps for L.A. Region as Possible Supplement to ASCE 7-16 for City of L.A. (Logistics & Approach) Results to be Presented & Tentative Dates for Next UGMS Meeting Bob BachmanFarzad Naeim
14:45 - 15:00 CyberShake Validation Efforts Christine Goulet
15:00 - 15:15 Action Items for Next UGMS Meeting C.B. Crouse
15:15 Adjourn  


UGMS Members Attending:
*John Anderson (UNR)
*Jack Baker (Stanford)
C.B. Crouse (AECOM)
Bob Bachman (R.E. Bachman)
Jacobo Bielak (CMU)
*Art Frankel (USGS)
Christine Goulet (USC)
Rob Graves (USGS)
*Curt Haselton (CSUC)
John Hooper (MKA)
Marty Hudson (SEAOSC AMEC)
Charlie Kircher (Kircher & Associates)
Nico Luco (USGS)
Farzad Naeim (Farzad Naeim, Inc)
UGMS Members Absent:
Norm Abrahamson (PG&E)
Paul Somerville (AECOM)



Jesus Acosta (LA City)
*Brad Aagaard (USGS)
Domniki Asimaki (Caltech)
*Annemarie Baltay (USGS)
*Nenad Bijelic (Stanford University)
Scott Callaghan (USC)
*Greg Deierlein (Stanford University)
Tran Huynh (USC)
Tom Jordan (USC)
*Ting Lin (Marquette)

Phil Maechling (USC)
Allen Manalansan (LA City)
Kevin Milner (USC)
*Morgan Moschetti (USGS)
*Kim Olsen (SDSU)
Edric Pauk(USC)
*Sanaz Rezaeian (USGS)
Andreas Skarlatoudis (AECOM)
*Ricardo Taborda (Memphis)

*Remote Participants


Download map of selected study sites and KMZ file.

Download site list with Vs30 and basin depth information. Note that CyberShake applies a minimum Vs floor of 500 m/s.


We have extracted timeseries data for the following 4 events:

  1. Southern San Andreas, nucleating near Bombay Beach (33.3772, -115.74, 4.1514 km deep): source 59, rupture 3, rupture variation 0.
    Plots available here.
  2. Southern San Andreas, nucleating near the Carrizo Plain (35.2809, -119.8182, 12.3263 km deep): source 59, rupture 3, rupture variation 296.
    Plots available here.
  3. Southern San Andreas, nucleating near the Cajon Pass (34.3123, -117.5051, 20.3019 km deep): source 59, rupture 3, rupture variation 144.
    Plots available here.
  4. Puente Hills (34.0811, -118.0461, 12.4803 km deep): source 242, rupture 26, rupture variation 31.
    Plots available here.


Site Location Map 5s CyberShake Fault Hazard Curves 5s GMPE Fault Hazard Curves 5s CyberShake Distance/Mag Disaggregation 5s GMPE Distance/Mag Disaggregation CyberShake Relative Fault Exclusion Impact CyberShake Fault Exclusion Impact