SCEC Workshop on Ductile Rheology of the Southern California Lithosphere
Conveners: Wayne Thatcher, Yuri Fialko, Liz Hearn, and Greg Hirth
Dates: May 1-2, 2013
Location: USGS Menlo Park Campus (Building 3, Room 3-235)
SCEC Award and Report: 13051
SUMMARY: The goals of the 2-day workshop are to share recent developments among experts in the properties and processes of ductile deformaton; define a range of viable rheological models for the lithosphere in actively deforming regions; better understand how to model ductile processes; and investigate how to apply this new knowledge base to constrain how ductile/elastic coupling influences stress state and earthquake occurrence in Southern California.
PARTICIPANTS (28 Total, 2 Remote): Whitney Behr (UT Austin), Greg Beroza (Stanford), Bruce Bills (NASA JPL), Roland Burgmann (UC Berkeley), Reid Cooper (Brown), Georg Dresen (GFZ Potsdam), Brian Evans (MIT), Uli Faul (BU), Yuri Fialko (UCSD), Andy Freed (Purdue), Laurel Goodwin (Wisconsin), Lars Hansen (Stanford), Jeanne Hardebeck (USGS), Liz Hearn, Eric Hetland (Michigan), Greg Hirth (Brown), Tran Huynh (SCEC), Kaj Johnson (Indiana), Karen Luttrell (USGS), Andreas Mavromatis (Stanford), Christine McCarthy (Columbia), Laurent Montesi (Maryland), Jessica Murray (USGS), John Platt (USC), Fred Pollitz (USGS), Paul Segall (Stanford), Wayne Thatcher (USGS), Jessica Warren (Stanford).
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 They may contain unpublished or preliminary information and should only be used while viewing the talk.
WEDNESDAY, MAY 1, 2013
| 08:30 |
Introduction and Purpose of Workshop |
W. Thatcher |
| 08:40 |
SCEC Perspective on Workshop |
G. Beroza |
| 08:50 |
Community Geodetic Model (CGM) & Rheology |
J. Murray |
| 09:00 |
Community Stress Model (CSM) & Role of Rheology |
J. Hardebeck |
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Session 1: Space Geodetic Observations and Modeling of Earthquake Cycle Deformation
Chair & Moderator: Liz Hearn, Reporter: Eric Hetland |
| 09:10 |
Lithospheric Rheology & the Earthquake Cycle |
L. Hearn |
| 09:55 |
Discussion of Previous Overview Paper |
All |
| 10:15 |
Break |
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| 10:30 |
Short Presentations (10 minutes each)
- Crust and upper mantle viscosity estimates from late Pleistocence lake studies (B. Bills)
- Potential biases in inferences of lithospheric viscosities from interseismic deformation (E. Hetland)
- Decadal-scale crustal deformation transients in Japan prior to the 2011 Tohoku earthquake (A. Mavrommatis)
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| 11:00 |
Open Discussion of Important Issues & Unanswered Questions |
All |
| 12:30 |
Lunch |
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Session 2: Laboratory Perspectives on Ductile Flow Applicable to Earthquake Processes
Chair & Moderator: Greg Hirth, Reporter: Ulrich Faul |
| 13:30 |
Lab Constraints on Lithospheric Ductile Flow |
G. Hirth |
| 14:15 |
Discussion of Previous Overview Paper |
All |
| 14:45 |
Short Presentations (10 minutes each)
- Rheology of two phase aggregates (G. Dresen)
- Experimental observation of transient creep of upper mantle rocks (U. Faul)
- Viscous anisotropy and its role in maintaining lithospheric-scale transform faults (L. Hansen)
- Reading rocks (B. Evans)
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| 15:15 |
Break |
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15:30 |
Open Discussion of Important Issues & Unanswered Questions |
All |
| 17:00 |
Adjourn |
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| 18:30 |
Workshop Group Dinner at the Left Bank Menlo Park |
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| THURSDAY, MAY 2, 2013 |
Session 3: Field Evidence Bearing on Ductile Flow Beneath the Seismogenic Crust
Chair & Moderator: John Platt; Reporter: Whitney Behr |
| 08:30 |
Faults in the ductile lithosphere: localization, rheology, flow stress, and width |
J. Platt |
| 09:00 |
Discussion of Previous Overview Paper |
All |
| 09:30 |
Short Presentations (10 minutes each)
- Rheological properties of the mantle lid beneath the central Mojave from xenoliths (W. Behr)
- Extracting quantitative rheological information from field studies (L. Goodwin)
- Shear zone formation and strain-dependent strength profile (L. Montesi)
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| 10:00 |
Break |
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| 10:15 |
Open Discussion of Important Issues & Unanswered Questions |
All |
| 11:45 |
Constitutive relationships for viscoelastic flow in postseismic and earthquake cycle analyses: past, present, and future |
R. Cooper / A. Freed |
| 12:00 |
Lunch |
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Session 4: Wrap Up Discussion of Main Problems & Workshop Recommendations
All Contribute, Moderated by Conveners |
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| 13:00 |
Summary Presentations from 3 Session Reporters |
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| 13:45 |
Discussion of Most Important Issues to Emerge from Workshop |
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| 14:30 |
Recommendations to SCEC and Workshop Report |
All |
| 15:00 |
Adjourn |
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