T22C:
The Mechanism of Tectonic Tremor I


Session ID#: 8833

Session Description:
Low and very low frequency earthquakes detected within tectonic tremor bursts suggest brittle shear failure occurs at the source of tremor. Tremor occurs on subduction and transform plate boundaries and at a variety of depths. Grain scale deformation mechanisms may vary at these different locations, yet tremor is observed to have similar seismological characteristics. The physical conditions and processes that drive transitional behavior in mixed rheology deformation may be key to understanding whether there are common mechanisms at the source of tremor. In this session, we hope to include seismological observations, geological constraints, and insights from modeling and experiments to encourage an extensive review of tremor source processes. We also invite studies of microseismicity, repeating earthquakes and other phenomena in transitional fault regions that may shed light on the mechanisms of tremors and their implications for earthquake nucleation processes.
Primary Convener:  James D Kirkpatrick, McGill University, Earth & Planetary Sciences, Montreal, QC, Canada
Conveners:  Whitney M Behr, Structural Geology and Tectonics Group, Geological Institute, ETH Zurich, Zurich, Switzerland, Zurich, Switzerland, David R Shelly, USGS National Earthquake Information Center, Golden, United States and Jean Paul Ampuero, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Chairs:  James D Kirkpatrick, McGill University, Earth & Planetary Sciences, Montreal, QC, Canada, Whitney M Behr, Structural Geology and Tectonics Group, Geological Institute, ETH Zurich, Zurich, Switzerland, Zurich, Switzerland, David R Shelly, U.S. Geological Survey, Geologic Hazards Science Center, Golden, CO, United States and Jean Paul Ampuero, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
OSPA Liaison:  James D Kirkpatrick, McGill University, Earth & Planetary Sciences, Montreal, QC, Canada

Cross-Listed:
  • MR - Mineral and Rock Physics
  • S - Seismology
Index Terms:

7230 Seismicity and tectonics [SEISMOLOGY]
8034 Rheology and friction of fault zones [STRUCTURAL GEOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8150 Plate boundary: general [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Tectonic Tremor and the Collective Behavior of Low-Frequency Earthquakes (Invited) (58392)
William Benjamin Frank1, Nikolai Shapiro2, Allen L Husker3, Vladimir Kostoglodov4, Michel Campillo4 and Alexander A Gusev5, (1)Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States, (2)Institut de Physique du Globe de Paris, Paris Sorbonne Cité, CNRS, Paris, France, (3)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (4)U.N.A.M., Mexico City, Mexico, (5)Inst Volcanology & Seismology, Petropavlovsk-Kamcha, Russia
Geology of the Tremor Source: What are the Active Processes? (Invited) (59437)
Ake Fagereng1, Michael Ian Hay Hartnady2 and Johann F.A. Diener2, (1)Cardiff University, Cardiff, CF24, United Kingdom, (2)University of Cape Town, Department of Geological Sciences, Cape Town, South Africa
On the Rheology of Slow Slip Events Around Continental Moho (76524)
Xiang Gao1, Kelin Wang2, Ikuko Wada3 and Jiangheng He2, (1)Institute of Oceanology, Chinese Academy of Sciences, Key Laboratory of Marine Geology and Environment, Qingdao, China, (2)Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada, (3)University of Minnesota Twin Cities, Earth and Environmental Sciences, Minneapolis, United States
The Physics of Low-Frequency Earthquakes with Doubling Recurrence Intervals near Parkfield (78445)
Deepa Mele Veedu, Nanyang Technological University, Singapore, Singapore; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore and Sylvain Barbot, University of Southern California, Department of Earth Sciences, Los Angeles, United States
Comparison of Tectonic Tremor in Southwest Japan and Cascadia (86399)
Kenneth C Creager, University of Washington, Earth and Space Sciences, Seattle, WA, United States and Kazushige Obara, The University of Tokyo, Earthquake Research Institute, Tokyo, Japan
Magnitudes and Moment-Duration Scaling of Low-Frequency Earthquakes Beneath Southern Vancouver Island (Invited) (59313)
Michael G Bostock, The University of British Columbia, Dept of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada, Amanda Thomas, University of Oregon, Department of Earth Sciences, Eugene, United States, Allan M Rubin, Princeton University, Princeton, NJ, United States, Genevieve Savard, University of British Columbia, Vancouver, BC, Canada and Lindsay Yuling Chuang, Georgia Institute of Technology Main Campus, Earth and Atmospheric Science, Atlanta, GA, United States
Apparent LFE Magnitude-Frequency Distributions and the Tremor Source (79502)
Allan M Rubin, Princeton University, Princeton, NJ, United States and Michael G Bostock, University of British Columbia, Vancouver, BC, Canada
Depth-Dependent Earthquake Properties Beneath Long-Beach, CA: Implications for the Rheology at the Brittle-Ductile Transition Zone (74281)
Asaf Inbal1, Robert W Clayton1 and Jean Paul Ampuero2, (1)Tel Aviv University, Tel Aviv, Israel, (2)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States

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