T42C:
New Insights on the Cascadia Subduction Zone from Offshore and Amphibious Studies

Submit an Abstract to this Session



Session ID#: 31196

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:  Kerry Key, Lamont-Doherty Earth Observatory, Columbia University, Palisades, United States and William Bythewood Hawley, Berkeley Seismological Laboratory, Berkeley, CA, 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:

Acoustic Reverse Time Migration of the Cascadia Subduction Zone Dataset (266959)
Lingxiao Jia and Subhashis Mallick, University of Wyoming, Laramie, WY, United States
Dry Juan de Fuca slab revealed by quantification of water entering Cascadia subduction zone (253343)
Juan Pablo Canales, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Suzanne M Carbotte, LDEO, Palisades, NY, United States, Mladen R Nedimovic, National Facility for Seismological Investigations (NFSI), Halifax, NS, Canada and Helene Delphine Carton, Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, Paris, France
Uppermost Mantle Deformation and Hydration Beneath the Gorda Plate Inferred from Pn Travel-times (261062)
Brandon VanderBeek, University of Oregon, Eugene, United States and Douglas R Toomey, University of Oregon, Department of Earth Sciences, Eugene, United States
Three-Dimensional Variation of the Slab Geometry Along Strike and Along Dip in the Cascadia Subduction (229334)
Haiying Gao, University of Massachusetts Amherst, Department of Earth, Geographic, and Climate Sciences, Amherst, United States
Three-Dimensional Magnetotelluric Imaging of the Cascadia Subduction Zone with an Amphibious Array (288417)
Gary D Egbert1, Bo Yang2, Paul Bedrosian3, Anna Kelbert4, Kerry Key5, Dean Livelybrooks6, Blake Anthony Parris6 and Adam Schultz7, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (2)China University of Geosciences Wuhan, Wuhan, China, (3)USGS, Denver, CO, United States, (4)Geologic Hazards Science Center Denver, Denver, CO, United States, (5)Institute of Geophysics and Planetary Physics La Jolla, La Jolla, CA, United States, (6)University of Oregon, Eugene, OR, United States, (7)Oregon State University, College of Earth, Ocean and Atmospheric Sciences, Corvallis, OR, United States
Mantle Flow and Dehydration Beneath the Juan de Fuca Plate Revealed by Shear Velocity and Attenuation (Invited) (262205)
Youyi Ruan, Princeton University, Princeton, NJ, United States, Donald W Forsyth, Brown Univ, Providence, United States and Samuel Wade Bell, Brown University, Providence, RI, United States
Tomographic Imaging of the Cascadia Subduction Zone and Juan de Fuca Plate System: Improved Methods Eliminate Artifacts and Reveal New Structures (278930)
Miles Bodmer, Sandia National Laboratories, Albuquerque, NM, United States, Douglas R Toomey, University of Oregon, Department of Earth Sciences, Eugene, United States, Emilie E E Hooft, PhD, University of Oregon, Department of Earth Sciences, Eugene, OR, United States, Maximiliano Bezada, University of Minnesota, Earth & Environmental Sciences, Minneapolis, United States, Brandon Schmandt, University of New Mexico, Earth and Planetary Sciences, Albuquerque, United States and Joseph S Byrnes, University of Minnesota Twin Cities, Earth & Environmental Sciences, Minneapolis, United States
Array-Based Receiver Function Analysis of the Subducting Juan de Fuca Plate Beneath the Mount St. Helens Region and its Implications for Subduction Geometry and Metamorphism (257867)
Michael Everett Mann1, Geoffrey A Abers1, Kenneth C Creager2, Carl W Ulberg3 and Kayla Crosbie1, (1)Cornell University, Ithaca, NY, United States, (2)Applied Physics Laboratory University of Washington, Seattle, WA, United States, (3)University of Washington, Department of Earth and Space Sciences, Seattle, United States

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