T43F:
New Insights on the Cascadia Subduction Zone from Offshore and Amphibious Studies

Submit an Abstract to this Session



Session ID#: 31190

Session Description:
Subduction zones, one of Earth’s fundamental tectonic environments, play a key role in many Earth processes. Consequently, they require study by interdisciplinary methods. However, our understanding of subduction zones has been limited by a lack of offshore and amphibious data. At the Cascadia subduction zone, new data collected over the last several years have helped close this gap, elucidating a wide range of new insights, including the structure of the incoming lithosphere, the role of water and volatiles in the subducting plate, asthenospheric flow above and below the subducting lithosphere, the transition from locking to slipping behavior along the plate interface, and the nature of episodic tremor and slip. We invite contributions broadly related to Cascadia geoscience that focus on new results from seismology, magnetotellurics, geodesy, geodynamics, hazards, paleoseismology, geochemisty and petrology, with particular emphasis on insights gained from the contribution of offshore and amphibious data.
Primary Convener:  Helen A Janiszewski, Columbia University of New York, Palisades, NY, United States
Conveners:  William Bythewood Hawley, University of California Berkeley, Berkeley, CA, United States, Kerry Key, Institute of Geophysics and Planetary Physics La Jolla, La Jolla, CA, United States and Matthew James Cook, University of California, San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States
Chairs:  Matthew James Cook, University of California, San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States and Helen A Janiszewski, University of Hawaii at Manoa, Department of Earth Sciences, Honolulu, HI, United States
OSPA Liaison:  Helen A Janiszewski, University of Hawaii at Manoa, Department of Earth Sciences, Honolulu, HI, United States

Cross-Listed:
  • G - Geodesy
  • GP - Geomagnetism, Paleomagnetism and Electromagnetism
  • S - Seismology
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

1209 Tectonic deformation [GEODESY AND GRAVITY]
3006 Marine electromagnetics [MARINE GEOLOGY AND GEOPHYSICS]
3050 Ocean observatories and experiments [MARINE GEOLOGY AND GEOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Imaging Cascadia coupling: optimal design for an offshore seafloor geodetic network (233142)
Eileen L Evans and Sarah E Minson, U.S. Geological Survey, Menlo Park, CA, United States
Augmenting Onshore GPS Displacements with Offshore Observations to Improve Slip Characterization for Cascadia Subduction Earthquakes (290456)
Jessie K Saunders, Caltech, Pasadena, United States and Jennifer S Haase, Scripps Institution of Oceanography, UC San Diego, Institute of Geophysics and Planetary Physics, La Jolla, United States
3-D Simulation of Earthquakes on the Cascadia Megathrust: Key Parameters and Constraints from Offshore Structure and Seismicity (Invited) (230262)
Erin A Wirth1,2, Arthur D Frankel2, Prof. John Emilio Vidale3, Ian Stone4, Marafi Nasser4 and William J Stephenson5, (1)University of Washington, Earth and Space Sciences, Seattle, WA, United States, (2)U.S. Geological Survey, Seattle, United States, (3)Univ Washington, Seattle, WA, United States, (4)University of Washington, Seattle, WA, United States, (5)U.S. Geological Survey, Denver, CO, United States
Catalog of offshore seismicity in Cascadia: Insights into the regional distribution of microseismicity and its relation to subduction processes (232864)
Ian Stone, University of Washington Seattle, Seattle, WA, United States, Prof. John Emilio Vidale, University of Southern California, Los Angeles, CA, United States, Shuoshuo Han, University of Texas, Institute for Geophysics, Austin, United States and Emily C Roland, University of Washington, School of Oceanography, Seattle, WA, United States
High-velocity basal sediment package atop oceanic crust, offshore Cascadia: Impacts on plate boundary processes and fluid migration (277844)
Dana E Peterson and Katie M Keranen, Cornell University, Earth and Atmospheric Sciences, Ithaca, NY, United States
Evidence for Patchy Sediment Underthrusting and a Strong, Drained Outer Accretionary Wedge in Central Cascadia: Implications for Dynamic Slip Conditions (290132)
Harold J Tobin, University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States and Susanna I Webb, University of Wisconsin Madison, Madison, WI, United States
Resolving plate structure across the seismogenic zone in Cascadia from onshore-offshore receiver function imaging (256375)
Pascal Audet and Andrew J Schaeffer, University of Ottawa, Department of Earth and Environmental Sciences, Ottawa, ON, Canada

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