T24B:
Synthesis: Knowns and Unknowns of the Cascadia Subduction Zone I


Submit an Abstract to this Session


Session ID#: 56988

Session Description:
The Cascadia subduction zone is a global end-member warm-slab subduction zone and exhibits along-strike variations in subduction parameters (e.g., incoming plate age) and mechanical behavior (e.g., seismogenesis), serving as a unique natural laboratory to investigate a range of subduction zone processes, including tsunamigenic megathrust earthquakes, episodic tremor and slip, and arc volcanism. As these processes pose natural hazards, understanding their underlying causes is critical to natural hazard mitigation. The recent influx of offshore and onshore geophysical, geochemical, and geological data provides new opportunities to evaluate the entire Cascadia subduction zone in a coherent and consistent manner at various length and time scales. This session aims to synthesize recent findings and outstanding questions about this subduction system and the processes that occur within. We invite contributions from a wide range of disciplines, including (paleo)seismology, earthquake mechanics, geodesy, magnetotellurics, geochemistry, petrology, volcanology, structural geology, rock mechanics, and geodynamics.
Primary Convener:  Helen A Janiszewski, Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, United States
Conveners:  Wenyuan Fan, Scripps Institution of Oceanography, La Jolla, United States, Ikuko Wada, University of Minnesota, Department of Earth and Environmental Sciences, Minneapolis, United States and Caroline Seyler, University of Texas, Austin, Institute for Geophysics, Austin, United States
Primary Liaison:  Helen A Janiszewski, Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, United States
Chairs:  Helen A Janiszewski, Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, United States, Wenyuan Fan, Scripps Institution of Oceanography, La Jolla, United States, Ikuko Wada, Department of Earth Sciences, Minneapolis, United States and Caroline Seyler, University of Texas, Austin, Institute for Geophysics, Austin, United States
OSPA Liaison:  Helen A Janiszewski, Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, United States

Cross-Listed:
  • G - Geodesy
  • NH - Natural Hazards
  • S - Seismology
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]
8180 Tomography [TECTONOPHYSICS]
8185 Volcanic arcs [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Results From 40 Years of Crustal-Scale Active-Source Wide-Angle Seismic Profiling in Cascadia (444336)
Thomas M Brocher, U.S. Geological Survey, Earthquake Science Center, Menlo Park, CA, United States
The Effect of Kinematic Earthquake Rupture on Near-Field Hazards Along the Cascadia Subduction Zone (Invited) (411929)
Amy Williamson, University of Oregon, Department of Earth Sciences, Eugene, OR, United States, Diego Melgar, University of Oregon, Department of Earth Sciences, Eugene, United States, Donsub Rim, Washington University in St Louis, Mathematics, St Louis, United States and Randall J LeVeque, University of Washington, Applied Mathematics, Seattle, United States
The evolution of the hydration state of the Juan de Fuca plate from Ridge to Trench offshore Washington State (412857)
Bridgit Boulahanis, Columbia University of New York, Palisades, NY, United States, Juan Pablo Canales, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Suzanne M Carbotte, Lamont-Doherty Earth Observatory, Palisades, United States, Helene Delphine Carton, Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, Paris, France, Shuoshuo Han, University of Texas, Institute for Geophysics, Austin, United States and Mladen R Nedimovic, National Facility for Seismological Investigations (NFSI), Halifax, NS, Canada
Seismic imaging of the Gorda slab subduction interface near the Mendocino triple junction (424849)
Jianhua Gong, Woods Hole Oceanographic Institution, Woods Hole, United States, Prof. Hao Guo, PhD, USTC University of Science and Technology of China, Hefei, China and Jeffrey Joseph McGuire, U.S. Geological Survey, Earthquake Science Center, Menlo Park, United States
The Electrical Conductivity of Dehydrating Lawsonite and Implications for Cascadia Subduction Zone Structure (Invited) (345860)
Anne Pommier, University of California San Diego, La Jolla, CA, United States, Rob L Evans, Woods Hole Oceanographic Institution, Woods Hole, United States and Quentin Williams, University of California Santa Cruz, Earth and Planetary Science, Santa Cruz, United States
Garnet Stability in Typical Arc Magmas – Experimental Results for Mount St. Helens Dacite (398418)
Dawnika L Blatter, USGS Volcano Science Center, Menlo Park, United States, Thomas W Sisson, USGS, Menlo Park, CA, United States; USGS Volcano Science Center, Moffett Field, United States and William B Hankins, USGS Volcano Science Center, Menlo Park, CA, United States

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