December 2010 PUC Meeting Summary – Appendix G
Briefing on PUC Design Mapping Task Group by Nico Luco
Slide 1
Briefing on
PUC Design Mapping Task Group
(Luco, Kircher, Crouse, Hooper, Bachman, Dolan, Others?)
Building Seismic
Council
(BSSC)
ProvisionsAttenuation
Update Committee
(PUC) Meeting
EERI Safety
Seminar
on Next
Generation
Models
Nicolas Luco
Research Structural Engineer
USGS
Golden, CO
Slide 2
Outline of Topics
• 2013 USGS National Seismic Hazard Maps/Curves
– Schedule
– Updates underway
– Proposed update: Map maximum-direction spectral
response accelerations directly.
• 2014 NEHRP Provisions Design Maps
– Schedule
– Potential issues (only 2 at this time)
– Supplemental design values on USGS website?
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
December 7, 2010
New seismic design maps are
based on new hazard maps that
Mark described, which in turn are
based on the NGA models, and now
I’ve met the requirement of saying
“NGA” at least once during my
presentation.
Slide 3
Attenuation
NGA-East (2014)
NGA-West (2012)
California
Workshop
UCERF (2012)
Process for 2013 Hazard Maps
National
User-Needs
Workshop (2012)
Comments From
Outside Community
PACNW Workshop
Cascadia Working Group,
subduction zone
Meeting (2012)
IMW
Workshop
WSSPC, WGUEP
Meetings (2012)
CEUS
Bicentennial
Workshop (2011)
Draft maps
Winter 2013
Working meetings
GPS
2012-2013
Draft maps
Summer 2013
Advisor Panel
Quality Assurance
Final Maps
Released
DEC 2013
BSSC 2014
ASCE7 2016
Version 2 maps
DEC 2014
The CHINA/USA Symposium for the Advancement of Earthquake Sciences and Hazard Mitigation Practices
Slide 4
2013 USGS Hazard Updates Underway
• Next Generation Attenuation (NGA) East, with PEER
• NGA West 2, by PEER
+ CEUS Seismic
Source Characterization from NRC
+ New subduction
zone attenuation
from BC Hydro
+ Others
• Uniform CA Earthquake Rupture Forecast (UCERF) 3.0,
with SCEC and CA Geological Survey
• Working Group on Utah Earthquake Probabilities, with
Utah Geological Survey
• Maps for Guam & N. Mariana Islands, American Samoa
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
Slide 5
December 7, 2010
PEER Proposal for Max-Direction GMPEs
• Improve current 1.1 and 1.3 factors by developing
max-direction versions of NGA GMPEs
– Captures uncertainty in factors
Also:
• Captures any dependence on Rrup, Mw, etc.
• Leverages NGA-East
funding (NRC) covering
max-direction GMPEs
Ratio of maximum rotated horizontal ground
motion to the geometric mean (GMRotI50) used in
NGA models (Campbell & Bozorgnia, 2007).
• Useful for site-specific
analysis (e.g. other T’s)
– Leverages NGA-West 2 funding (CEA, Caltrans, PG&E)
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
December 7, 2010
Slide 6
2014 NEHRP Provisions Design Maps
• Schedule
– Approximately 1 month after underlying draft/final
hazard maps, with tables of values for 34+ cities
• Potential Issues
– Maps of MCER Ground Motions (ASCE 7-10) and/or
Uniform-Hazard GMs, Risk Coefficients, and
Deterministic GMs (2009 NEHRP Provisions)?
– Increased deterministic ground motions from UCERF3
relaxed segmentation and multi-fault ruptures?
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
Slide 7
December 7, 2010
Supplemental Design Values ?
• Hazard values for
other site classes
(besides B) and other
vibration periods
(besides 0.2 & 1.0s)
already available
• Add corresponding
design (“MCER”)
values (following sitespecific procedures)?
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
Slide 8
December 7, 2010
Supplemental Design Values ?
• “Urban” hazard values
already available for
Seattle (underway for
other cities)
• Add corresponding
design (“MCER”) values
(following site-specific
procedures), without
site response?
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
December 7, 2010
Slide 9
Outline of Topics
• 2013 USGS National Seismic Hazard Maps/Curves
– Schedule
– Updates underway
– Proposed update: Map maximum-direction spectral
response accelerations directly.
• 2014 NEHRP Provisions Design Maps
– Schedule
– Potential issues (only 2 at this time)
– Supplemental design values on USGS website?
Building Seismic Safety
Councilon
(BSSC)
Provisions Update
Committee
EERI Seminar
Next Generation
Attenuation
Models(PUC) Meeting
“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS
December 7, 2010
Slide 10
• Being shaped to meet needs of
FEMA-funded ATC-58 “Guidelines
for Seismic Performance
Assessment of Buildings.”
• Delivers hazard curves and
uniform-hazard spectra for userspecified locations.
• Includes site soil classifications B,
C, C-D (boundary), D, & D-E in
addition to B-C (vS30=760).
• Includes structural vibration
periods T = 0, 0.1, 0.3, 0.5, 0.75,
2.0, 3.0, 4.0, & 5.0 in addition to
0.2 and 1.0 seconds.
• Will eventually interpolate and/or
compute curves/spectra “on-thefly” for user-specified T & vS30.
Acknowledgements: Peter
Powers is the lead developer of this
app. Other key developers include
Eric Martinez, Nicolas Luco, and
Melanie Walling.