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NGA-East Tentative Plan. March 7, 2008. Brainstorming Technical Workshop in 2007. To compile a list of key technical issues and R&D projects to be addressed in the course of NGA-East The list was finalized through iterations - PowerPoint PPT Presentation
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Brainstorming Technical Workshop in 2007
To compile a list of key technical issues and R&D projects to be addressed in the course of NGA-East
The list was finalized through iterations
Consensus was to develop Next Generation Models rather than updating PSHA implementation of the existing modelsVery short summary of topics…
Supporting R&D Topics for NGA-East: 1
Database: Compile a database of recorded
motions from CEUS and other Stable Continental Regions (SCR)
Data will be processed uniformly, reviewed, and QA’d
PGA, PGV, PGD, and response spectra for periods 0.01 to 10 sec
Database (cont’d)
Database metadata should include: Moment magnitude for all EQs Rupture, JB, epicental and hypocentral
distances Vs30 and basin/sediment depth
estimates at recording stations …
In order to save time, for short term, a working group on database is formed
Topic 2
Source Rupture Characterization: Source parameter database:
Rupture area, moment, …
Compare source characteristics of EQs in magnitude range of 4-5 from WUS to CEUS: Any difference? Why?
…
Source-Site Path:
Geometrical spreading effects: What is the physical cause for a geometrical spreading steeper than 1/R?
Are there differences for geometrical spreading between WUS and CEUS?
…
Topic 3
Site Effects:
Define a reference site condition to use in the development of the attenuation models for CEUS
Are site-response effects transferable from WUS to CEUS?
…
Topic 4
Constraints on Attenuation Models:
Develop and use MMI distributions for CEUS and other SCR earthquakes to constrain and check spectral levels for large magnitudes
Collect and analyze liquefaction data to constrain predicted spectral ordinates
…
Topic 5
Ground Motion (GM) Simulation
Calibrate & validate GM simulation models using CEUS and other SCR data
Use calibrated and validated simulation models to generate GMs to be used by attenuation modelers (for a range of magnitude, distances, …)
…
Topic 6
Modeling Issues for Attenuation
Next generation attenuation models for CEUS should be applicable to magnitude 4-8, distances of 500km
Horizontal and Vertical components Demonstrate agreement of new models
with observed data in CEUS and other SCRs
Develop aleatory uncertainty models for CEUS (function of magnitude, distance, …)
Topic 7
Implementation of Attenuation Models for PSHA
Develop an epistemic uncertainty model
Determine weights to be assigned to the new attenuation models
…
Topic 8
Duration & Budget
Final models ready to be reviewed by various stakeholders (including USGS): In Five years One year to review, collect
comments, adopt for various applications (including National Seismic Hazard Maps)
Estimated overall budget: $4.4M (including database, supporting R&D projects, attenuation models,…)
Fully Transparent ProcessDuring the course of NGA-East program, the database developers, attenuation modelers, researchers, stakeholders and end-users of models will all be involved in a multi-disciplinary and fully transparent process
The compiled database along with its documentations will be available to the public via an NGA-East web site
The reports on the supporting research projects will be also available to the public
Fully Transparent Process
For each attenuation model, there will be draft and final reports to document modeling development, assumptions, derivations, etc.Reports will be electronically available to the public free of charge
Fully Transparent Process
We would like to invite you to join NGA-East
As a co-sponsor: Various organizations will benefit from NGA-
East: NRC, USGS, DOE, NEHRP, other Federal Agencies,
…private industry, utilities,… Be part of Joint Management Committee
(JMC) to direct the program
Be involved in various technical activities: Technical working groups; Workshops Supporting R&D projects