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 They may contain unpublished or preliminary information and should only be used while viewing the talk.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 Bachman / Farzad 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 |
PARTICIPANTS
*Remote Participants
UGMS SELECTED STUDY SITES
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.
SAMPLE CYBERSHAKE TIME SERIES
We have extracted timeseries data for the following 4 events:
- 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. - 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. - 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. - Puente Hills (34.0811, -118.0461, 12.4803 km deep): source 242, rupture 26, rupture variation 31.
Plots available here.
SAMPLE HAZARD AND DISAGGREGATION PLOTS
| 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 |
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| COO |  |
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| PAS |  |
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| SBSM |  |
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