T13H:
Synthesis: Knowns and Unknowns of the Cascadia Subduction Zone II Posters


Submit an Abstract to this Session


Session ID#: 47390

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:  Ikuko Wada, Department of Earth Sciences, Minneapolis, United States, Caroline Seyler, University of Texas, Austin, Institute for Geophysics, Austin, United States, Wenyuan Fan, Scripps Institution of Oceanography, La Jolla, United States and Helen A Janiszewski, Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, 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:

Seismic Investigation of the Cascadia forearc in Central Oregon through the deployment of nodal seismometers (418550)
Audrey Dunham, US Geological Survey, Seattle, United States and Eric Kiser, Rice University, Earth Science Department, Houston, TX, United States
New fossil foraminiferal estimates of coseismic vertical deformation during the AD 1700 Cascadia earthquake: Washington and northern California, USA (383250)
Jason Scott Padgett, USGS Pacific Coastal and Marine Science Center, Santa Cruz, United States, Simon E Engelhart, University of Rhode Island, Department of Geosciences, Narragansett, RI, United States, Niamh Cahill, University College Dublin, School of Mathematical Science and Statistics, Dublin, Ireland, Andrea Hawkes, University of North Carolina at Wilmington, Earth and Ocean Sciences, Wilmington, United States, Benjamin Peter Horton, Asian School of the Environment, Nanyang Technological University, Singapore, Singapore; Rutgers University, Department of Marine and Coastal Sciences, New Brunswick, United States, Isabel Hong, Institute of Marine and Coastal Science, New Brunswick, NJ, United States, Alan R Nelson, US Geological Survey, Denver, United States, Robert Carleton Witter, U.S. Geological Survey, Alaska Science Center, Anchorage, United States, Harvey M Kelsey, Cal Poly Humboldt, Geology, Arcata, United States and Tina Dura, Virginia Polytechnic Institute and State University, Geosciences, Blacksburg, United States; Humboldt State University, Arcata, CA, United States
Northward Migration of the Oregon Fore-arc Block on the Gales Creek Fault (421836)
Ray E Wells, U.S. Geological Survey, Portland, OR, United States, Richard J Blakely, USGS, Menlo Park, CA, United States, Joanna Redwine, Bureau of Reclamation, Denver, United States and Sean P Bemis, Virginia Tech, Geosciences, Blacksburg, United States
Eocene to Recent permanent forearc deformation in Northern Cascadia, southern Vancouver Island, British Columbia, Canada (399992)
Nicolas Harrichhausen1, Kristin D Morell1, Christine Regalla2, Scott E K Bennett3, Lucinda J Leonard4 and Emerson M Lynch5, (1)University of California Santa Barbara, Earth Science, Santa Barbara, CA, United States, (2)Boston University, Department of Earth and Environment, Boston, MA, United States, (3)USGS, Geology Minerals Energy and Geophysics Science Center, Menlo Park, CA, United States, (4)University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada, (5)Boston University, Earth and Environment, Boston, MA, United States
Upper plate deformation in northern Cascadia and active bending of the Olympic orocline (348218)
Kristin D Morell, University of California Santa Barbara, Earth Science, Santa Barbara, CA, United States, Theron Finley, University of Alberta, Edmonton, AB, Canada, Christine Regalla, Boston University, Department of Earth and Environment, Boston, MA, United States and Lucinda J Leonard, University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
Crustal Deformation in Southernmost Cascadia: Insights from GPS-inferred Strain Rate Maps (381983)
Carolyn Nuyen, University of Washington, Seattle, WA, United States and David A Schmidt, University of Washington Seattle, Department of Earth and Space Sciences, Seattle, United States
Inferred Slip Rates of Offshore Crustal Strike-Slip Faults in the Cascadia Accretionary Prism from Tectonic Block Models (382657)
David A Schmidt, University of Washington Seattle, Department of Earth and Space Sciences, Seattle, United States
The effects of episodic tremor and slip in the Cascadia subduction zone on upper plate deformation and stress accumulation during the earthquake cycle (357037)
Kirsty A McKenzie and Kevin P Furlong, Pennsylvania State University, Department of Geosciences, University Park, United States
: Upper Plate Deformation Across Active Faults in the Southern Cascadia Subduction Zone, Northern California: Geodetic Slip Rate Estimates Compared with Geologic Rates (415197)
Jason R Patton1, Thomas H Leroy2, Todd B Williams2, Mark Allen Hemphill-Haley3 and Robert C McPherson3, (1)Humboldt State University, Arcata, CA, United States, (2)Cascadia GeoSciences, McKinleyville, CA, United States, (3)Cal Poly Humboldt, Arcata, CA, United States
Controls on Seismicity in Cascadia (364322)
Michael G Bostock, Nikolas Christensen and Simon M Peacock, University of British Columbia, Vancouver, BC, Canada
Earthquake Stress Drop Estimates for Shallow Earthquakes Along the Central Oregon Segment of the Cascadia Subduction Zone (353352)
Susan L Bilek, New Mexico Institute of Mining and Technology, Earth and Environmental Science, Socorro, United States and Emily Morton, University of Nevada Reno, Nevada Seismological Laboratory, Reno, United States
Newly Detected, Small Earthquakes to Delineate Fault Heterogeneities in the Cascadia Seismogenic Zone (346921)
Emily Morton, University of Nevada Reno, Nevada Seismological Laboratory, Reno, United States, Susan L Bilek, New Mexico Institute of Mining and Technology, Earth and Environmental Science, Socorro, United States and Charlotte A Rowe, Los Alamos National Laboratory, Los Alamos, NM, United States
Using Cascadia Initiative Data to Investigate Seismicity and Possible Shallow Slow Slip Along the Southernmost Section of the Cascadia Subduction Zone (399241)
Travis Alongi1, Susan Y Schwartz2, Heather R Crume3, David Small2, Iris Xia4, Flora Huang5 and Kushaan Bahl5, (1)University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, United States, (2)University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States, (3)Santa Cruz Geophysics, Santa Cruz, United States, (4)University of California Santa Cruz, Santa Cruz, United States, (5)University of California Santa Cruz, COSMOS, Santa Cruz, United States
Searching for New Types of Slow Slip Events in the Cascadia Subduction Zone (414474)
Jeffrey Joseph McGuire, USGS, Moffett Field, CA, United States, John A Collins, WHOI, Woods Hole, MA, United States, Earl Davis, Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada, Wenyuan Fan, Scripps Institution of Oceanography, La Jolla, United States, Keir Becker, University of Miami - RSMAES, Miami, United States and Martin Heesemann, University of Victoria, Ocean Networks Canada, Victoria, BC, Canada
New Estimates of Earthquake Probability during Episodic Tremor and Slip in Cascadia (429331)
Nicholas Benz, Purdue University, West Lafayette, IN, United States and Noel M Jackson, University of California Berkeley, Berkeley, CA, United States
Quality analysis of high frequency air-gun shot seismic recording in the Juan de Fuca plate (395342)
Sampath Rathnayaka, University of Massachusetts Amherst, Amherst, MA, United States and Haiying Gao, University of Massachusetts Amherst, Department of Earth, Geographic, and Climate Sciences, Amherst, United States
Pn tomography of the Juan de Fuca and Gorda Plates: Constraints on Mantle Deformation and Hydration In Young Oceanic Lithosphere (397419)
Brandon VanderBeek, University of Oregon, Eugene, United States and Douglas R Toomey, University of Oregon, Department of Earth Sciences, Eugene, United States
Imaging the subducted Gorda plate: Implications for the stress state and brittle-ductile transition of the Cascadia subduction zone (426535)
Prof. Hao Guo, PhD, University of Science and Technology of China, Hefei, China; Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Jeffrey Joseph McGuire, USGS, Moffett Field, CA, United States and Haijiang Zhang, University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China
Preliminary results of crustal structure beneath the Juan de Fuca Plate: Constraints from OBS receiver function analysis (404168)
Haoran Du, Shenzhen, China and Ting Yang, Southern University of Science and Technology, Department of Earth and Space Sciences, Shenzhen, China
Mantle Dynamics beneath Mount St. Helens from Shear Wave Splitting (431352)
Caroline M Eakin, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, Erin Wirth, U.S. Geological Survey, Seattle, United States, Abraham Wallace, University of Oklahoma Norman Campus, Norman, United States, Carl W Ulberg, University of Washington, Department of Earth and Space Sciences, Seattle, United States, Kenneth C Creager, Univ Washington, Earth and Space Sciences, Seattle, United States and Geoffrey A Abers, Cornell University, Ithaca, United States
Does Subslab Buoyancy Govern Segmentation of Cascadia’s Forearc Topography? (462405)
Miles Bodmer1, Douglas R Toomey2, Josh J Roering3 and Leif Karlstrom2, (1)Sandia National Laboratories, Albuquerque, NM, United States, (2)University of Oregon, Department of Earth Sciences, Eugene, United States, (3)University of Oregon, Department of Earth Sciences, Eugene, OR, United States

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