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Toward a SCEC Community Rheology Model: Technical Activity Group Kickoff and Workshop


Peridotitic mylonite in a petrographic microscope. By Strekeisen - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=44917236

HOW CAN I PARTICIPATE?

Please contact the conveners if you are interested in participating in this workshop, or would like more information about the workshop.

Participants: 50 maximum

Date: September 9, 2017
Time: 9:00am-5:00pm
Location: Hilton Palm Springs Resort

SCEC Award: 17206

Conveners: Elizabeth HearnMichael OskinGreg HirthWhitney Behr and Wayne Thatcher

SUMMARY: The SCEC Community Rheology Model (CRM) is a new project for SCEC5. This resource will provide a 3D description of southern California rock types, temperatures and constitutive properties, which are essential for understanding time-varying tectonic stress accumulation and earthquake stress release in southern California. Since developing the CRM will require expertise from a broad swath of the SCEC community, we will be holding a kickoff workshop for potential CRM contributors and users.

The CRM workshop will comprise two parts. The first will be a “shot across the bow” - that is, a draft CRM for the Mojave Desert. A preliminary geologic framework, geotherm, and suite of admissible flow laws for this area will be presented, and the resulting viscosity structure (or range of admissible structures) will be described and tested for consistency with observed postseismic transients. The goals of this exercise are to better describe our vision for a full CRM, and to highlight complications and problems that must be overcome. The second part of the workshop will comprise two breakout sessions: one with participants sorted into disciplinary groups and the next with cross-disciplinary groups. Our goals with the breakout sessions are to (1) determine what each scientific discipline can contribute to the CRM over the next year and by the end of SCEC5, for the Mojave and southern California and (2) identify important scientific questions than can be addressed with a CRM (and other existing resources) by the end of SCEC5 - particularly, problems that relate to the five SCEC5 science questions. All potential CRM contributors and users are welcome, but attendees should be prepared to take an active role in the proceedings!

Presentation slides may be downloaded by clicking the links following the title. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.

SATURDAY, SEPTEMBER 9, 2017

09:00 - 09:15 Welcome, Motivation, Workshop Outline and Goals Elizabeth Hearn
  Geologic Framework and Community Thermal Model (CTM)  Michael OskinWayne Thatcher
09:15 - 09:30 Overview of the geologic framework, with emphasis on constraining the lithospheric architecture of the Mojave region Michael Oskin
09:30 - 09:45 Tectonic modification of the Mojave Desert region during laramide shallow-angle subduction Alan Chapman
09:45 - 10:00 Applying the depth distribution of seismicity to probe the rheology of the seismogenic crust in southern California Egill Hauksson
10:00 - 10:15 Discussion: How should geologic and tectonic inferences of lithosphere composition guide the CRM? All
10:15 - 10:30 Preliminary CTM, with an emphasis on the Mojave region Wayne Thatcher
10:30 - 10:45 Discussion: How important are thermal versus compositional differences? All
10:45 - 11:00 Break  
  Inferring Rheology, Preliminary Mojave CRM  Greg HirthWhitney Behr
11:00 - 11:15 Overview of rheologies for Mojave rock volumes and shear zones, guidance on differential stress, volatile content and other parameters for these flow laws Whitney Behr
11:15 - 11:30 Inversion of seismic velocity for rheology William Shinevar
11:30 - 11:45 Discussion: Geologic vs. seismic inference of rheology All
11:45 - 12:15 Preliminary Mojave CRM effective viscosities and their consistency (or not) with Hector Mine Earthquake postseismic deformation Elizabeth Hearn
12:15 - 12:30 Discussion: Assessing the CRM with deformation data and models All
12:30 - 13:30 Lunch  
13:30 - 14:30 Disciplinary Breakout Session I
What can each scientific discipline contribute to the CRM over the next year and by the end of SCEC5, for the Mojave and southern California?
All
14:30 - 14:45 Breakout Session I Summaries All
14:45 - 15:00 Break  
15:00 - 16:00 Interdisciplinary Breakout Session II
Identify important scientific questions than can be addressed with a CRM (and other existing resources) by the end of SCEC5 - particularly, problems that relate to the five SCEC5 science questions
All
15:00 - 16:15 Breakout Session II Summaries All
16:15 - 17:00 Next steps for 2018 and beyond: Our TAG
Other GF provinces, shear zones, delivery and sharing, future workshops and closing comments
Elizabeth HearnMichael OskinGreg HirthWhitney BehrWayne Thatcher
17:00 Adjourn