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- SCEC Committee for Utilization of Ground Motion Simulations Meeting 4
- Organizers: C.B. Crouse (AECOM) and Tom Jordan (SCEC/USC)
- Date: Monday, May 4, 2015 (10:00-15:30)
- Location: SCEC Media Room (ZHS 165), USC, Los Angeles, CA
- Participants: 24 (by invitation only)
Contents
Agenda
Presentation slides may be downloaded by clicking each title. PLEASE NOTE: Slides are the author's property. They may contain unpublished or preliminary information and should only be used while viewing the talk.
| 10:00 | Welcome and introductions | |
| 10:15 | Introductory Remarks and Meeting Agenda (see Handout) | C.B. Crouse |
| 10:30 | New Code Cycle (Project 17, BSSC Issue Teams, ASCE 7 SSC) | C.B. Crouse |
| 10:45 | Overview of SCEC CyberShake Platform | Tom Jordan |
| 11:00 | Update on SCEC CyberShake Progress | Phil Maechling |
| 11:30 | Calculation of Risk-Targeted Maximum Considered Earthquake Response Spectra (MCER) | Scott Callaghan |
| 12:00 | Lunch | |
| 13:00 | Southern California MCER Sa(T) maps – CyberShake vs. 2013 NGA West2 - CyberShake & NGA West2 Sa maps for T = 3, 5, & 10 sec - Ratio Maps (CyberShake/NGA West2) for each T - Discussion |
Kevin Milner |
| 13:30 | Calculation of v15.4 Risk-Targeted Maximum Considered Earthquake Response Spectra (MCER) at 14 Southern California Sites (T = 2 – 10 sec) | Scott Callaghan |
| 14:00 | Effect of Near-Surface Geology - SCEC Thick Surface Layer with Constant Material Properties vs. Realistic Model with Depth-Dependent Material Properties - Results of 1-D Site Response with Both Models - Discussion |
C.B. Crouse |
| 14:30 | Break | |
| 14:45 | Technical Issues, Logistics, & Schedule for Producing Long Period MCER Maps for L.A. Region in Short Term (e.g., Possible supplement to ASCE 7-16 for City of L.A.) and Long Term (2021 NEHRP & 2022 ASCE 7) | C.B. Crouse |
| 15:00 | Future Work for CyberShake | Tom Jordan |
| 15:15 | Results to be Presented and Tentative Dates for Next UGMS Meeting | |
| 15:30 | Adjourn |
Participants
| Member Attendees (in person) C.B. Crouse - chair John Anderson Rob Graves John Hooper Marty Hudson Tom Jordan Charlie Kircher Nico Luco Paul Somerville |
Member Attendees (remotely) Jack Baker Jacobo Bielak Art Frankel |
Members Absent Norm Abrahamson Bob Bachman Ron Hamburger Curt Haselton Lew Marshall Farzad Naeim |
Observers Domniki Asimaki Nenad Bijelic Scott Callaghan Tran Huynh Ting Lin Phil Maechling Kevin Milner Morgan Moschetti Kim Olsen Sanaz Rezaeian Andreas Skarlatoudis Ricardo Taborda |
Results
PSHA Hazard Curves & MCER Curves
MCER Maps (CyberShake v14.2)
| Period | Probabilistic MCER | Deterministic MCER | Deterministic Lower Limit | Combined MCER results |
|---|---|---|---|---|
| 3 Second RotD100 |
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| 5 Second RotD100 |
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| 10 Second RotD100 |
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GMPE Comparison Maps (CyberShake v14.2)
| Period | CyberShake Combined MCER | GMPE Combined MCER | Ratio (CyberShake/GMPE) |
|---|---|---|---|
| 3 Second RotD100 |
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| 5 Second RotD100 |
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| 10 Second RotD100 |
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CyberShake Action Items
- Plan CyberShake UCERF3 with initial runs 2015
- Run forward simulation of selected CyberShake ruptures to evaluate assumption of linear ground motion response.
- Clarify Deterministic MCER calculations with USGS.
- With Rob, modify hypocenter location probabilities to taper few hypocenters near top of fault.
- Discuss with Jacobo the large displacement he’s seeing in MCER results.
- Define a procedure for “approving” CyberShake result, short of publishing. Maybe define a series of stages to put a computational result through as they get checked
- Send out notification when we “certify” CyberShake 15.4 results
- Send out notification when we complete and certify CS 15.4 all sites and maps.
- Consider adding Alhambra Site City Emergency Response Center 10 Story Steel moment frame building.
