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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

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brainstorming technical workshop in 2007
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 models
  • Very short summary of topics…
supporting r d topics for nga east 1
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 (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
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?
topic 3
Topic 3
  • 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 4
Topic 4
  • 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 5
Topic 5
  • 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 6
Topic 6
  • 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 7
Topic 7
  • 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 8
Topic 8
  • Implementation of Attenuation Models for PSHA
    • Develop an epistemic uncertainty model
    • Determine weights to be assigned to the new attenuation models
topic 9
Topic 9
  • Other Related (but out of scope) Project
    • Develop VS30 and depth to bedrock maps for CEUS
duration budget
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 process
Fully Transparent Process
  • During 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

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 process1
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
we would like to invite you to join nga east
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