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
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HOW CAN I PARTICIPATE?
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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 SCEC Award: 17206 |
Conveners: Elizabeth Hearn, Michael Oskin, Greg Hirth, Whitney 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 Oskin, Wayne Thatcher | |
| 09:15 - 09:30 | Overview of the geologic framework, with emphasis on constraining the lithospheric architecture of the Mojave region (PDF, 5.6MB) | Michael Oskin |
| 09:30 - 09:45 | Tectonic modification of the Mojave Desert region during laramide shallow-angle subduction (PDF, 4.4MB) | 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 (PDF, 5.8MB) | 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 Hirth, Whitney 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 (PDF, 934KB) | 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 Hearn, Michael Oskin, Greg Hirth, Whitney Behr, Wayne Thatcher |
| 17:00 | Adjourn |
