Intermountain West Workshop - 2012

Science Center Objects

June 13-14, 2012

Officer's Club, University of Utah, Salt Lake City, Utah

The links in the following agendas are to PDF files of participants that have granted permission to view their presentations at the INW workshop.

Wednesday June 13th

Introduction & Overview

  • Review 2008 model and proposed changes (Petersen) 30 min
  • Recent research leading to improvements in the maps (Crone)
  • On-line resources (Powers)
  • BRPEWG II summary (Lund)

Review of BRPEWG Geology Recommendations and Results


  • Uncertainty in source dip
  • Characterization of source maximum M
  • Slip-rate uncertainty
  • Modeling antithetic sources

Open Discussion & Recommendations from Participants

Recommendations from IMW States

Additional topics

  • A proposed revision to the NSHM generalization of the Salt Lake City segment (Wasatch fault) surface trace (Pechmann)
  • Working Group on Utah earthquake probabilities (Wong)
  • Issues on implementing geodetic deformation estimate of fault slip rates and its application to the seismic hazard analysis (Zeng)
  • Low footwall accelerations and variable surface rupture behavior on the Fort Sage Mountains fault, NE California (Briggs)

Thursday June 14th



  • Catalog declustering and non-tectonic seismicity
  • Seismicity rates used in smoothed-gridded seismicity
  • Alternative catalogs
  • Issues in Considering Alternative Earthquake Catalogs for the NSHMP—Utah Catalog Example (Arabasz)
  • Hawthorne earthquake (Anderson)

Review of BRPEWG seismology recommendations and results

(Moschetti, Petersen)

  • Magnitude uncertainty in the seismicity catalogs used in the NSHMs
  • Constraining maximum M for background seismicity
  • Smoothing background seismicity
  • Magnitude-frequency relations for individual fault sources
  • Mismatch of modeled earthquake rate versus historical earthquakes

Open discussion & final recommendations from participants

Participant recommendations to the NSHMP

  • Estimation of uncertainty (Shome)
  • Comparison of GPS and geologic rates (Smith)
  • Final thoughts (Anderson)

Summary of final recommendations to the NSHMP


  • John Anderson, University of Nevada, Reno
  • Stephen Angster, USGS
  • Walter Arabasz, University of Utah
  • James Bela, Oregon Earthquake Awareness
  • Glenn Biassi, University of Nevada, Reno
  • Steve Bowman, Utah Geological Survey
  • Rich Briggs, USGS
  • Tony Crone, USGS
  • Craig dePolo, Nevada Bureau of Mines and Geology
  • Sarah Derouin, Bureau of Reclamation
  • Chris DuRoss, Utah Geological Survey
  • Chris Eisinger, Colorado Geological Survey
  • Jamie Farrell, University of Utah
  • Emily Gibson, Defense Nuclear Facilities Safety Board
  • Kathy Haller, USGS
  • Jeff Kimball, Defense Nuclear Facilities Safety Board
  • Bill Lund, Utah Geological Survey
  • Fredrick Massin, University of Utah
  • Morgan Moschetti, USGS
  • Dean Ostenaa, Fugro Consultants Inc.
  • Phil Pearthree, Arizona Geological Survey
  • Jim Pechmann, University of Utah
  • Steve Personius, USGS
  • Mark Petersen, USGS
  • Lucy Piety, Bureau of Reclamation
  • Peter Powers, USGS
  • Richard Quittmeyer, Paul C. Rizzo Associates, Inc.
  • Nilesh Shome, Risk Management Solutions
  • Bob Smith, University of Utah
  • Mike Stickney, Montana Bureau of Mines and Geology
  • Paul Thenhaus, EQCAT
  • Seth Wittke, Wyoming State Geological Survey
  • Ivan Wong, URS
  • Yuehua Zeng, USGS