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Session Proposal: The Cascadia Megathrust and Beyond: From Fundamental Scientific Processes to Societal Resilience (AGU25)

T022
The Cascadia Megathrust and Beyond: From Fundamental Scientific Processes to Societal Resilience

Session ID#: 252292

Session Description:
The Cascadia Subduction Zone has the potential to rupture in great (M>8) megathrust earthquakes, but with the near absence of interseismic interplate seismicity, the Cascadia megathrust earthquake cycle must be examined through a range of observational tools and modeling approaches. Developing an understanding of the many processes, associated hazards, and cascading consequences of this unique system requires the integration of different disciplines at a variety of spatial and temporal scales, including both novel observations and models. Greater fundamental knowledge of Cascadia geohazards and their impacts on communities are critical for future hazard mitigation, adaptation, and resiliency efforts. In this session, we welcome contributions from all areas of Cascadia and comparative subduction zone science. Topics may include, but are not limited to: earthquake seismology, geophysical imaging, geodesy, rock mechanics, paleoseismology, structural geology, petrology and geochemistry, cascading hazards, novel offshore instrumentation, community engagement, and geoscience education.
Co-Sponsor(s):
  • S - Seismology
Index Terms:

7230 Seismicity and tectonics [SEISMOLOGY]
7240 Subduction zones [SEISMOLOGY]
8150 Plate boundary: general [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]
Primary Convener:  Brian Boston, Auburn University, Auburn, United States
Conveners:  Audrey Dunham, U.S Geological Survey, Seattle, United States, Harold J Tobin, University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States and Jianhua Gong, Indiana University Bloomington, Bloomington, IN, United States
Student/Early Career Convener:  Zoe Krauss, University of Washington, Department of Earth and Space Sciences, Seattle, United States
 
Evolution of Fluid Pressure in the Northern Cascadia Outer Wedge Over Subduction Earthquake Cycles (1874206)
Tianhaozhe Sun1,2 and Kelin Wang1,2, (1)University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada, (2)Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada
 
Regional Shallow Velocity Structure of Northern California and Southern Cascadia from Frequency-dependent P-wave Particle Motions. (1878921)
Inashua Kharjana, Jonathan R Delph and Yunyue S Li, Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States
 
The CRESCENT Generation 0 Cascadia Community Velocity Model (1880831)
Bin He1,2, Jonathan R Delph3, Shihan Wu3, Emilie E E Hooft, PhD4, Alex Grant5, Valerie J Sahakian1, Pieter-Ewald Share6, William J Stephenson7, Erin A Wirth5, Brandon Herr8, Ross Maguire9, Rasheed Ajala10 and Guoliang Li11, (1)University of Oregon, Earth Sciences, Eugene, United States, (2)Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, United States, (3)Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, (4)University of Oregon, Department of Earth Sciences, Eugene, United States, (5)U.S. Geological Survey, Seattle, United States, (6)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States, (7)U.S. Geological Survey, Denver, CO, United States, (8)Rice University, Houston, United States, (9)University of Illinois at Urbana Champaign, Department of Earth Science and Environmental Change, Urbana, United States, (10)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States, (11)Central South University, School of Geosciences and Info-physics, Changsha, China
 
Investigation of shaking variability and basin response from full-margin Cascadia Subduction Zone megathrust earthquakes using 3D broadband ground motion simulations (1882075)
Audrey Dunham1, Erin A Wirth2, Alex Grant3, Arthur D Frankel3, Madeleine C Lucas4, Anna Ledeczi4, Harold J Tobin4, Janet Tilden Watt5 and James Biemiller6, (1)U.S Geological Survey, Seattle, United States, (2)U.S. Geological Survey, Earthquake Science Center, Seattle, United States, (3)U.S. Geological Survey, Seattle, United States, (4)University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States, (5)U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, United States, (6)U.S. Geological Survey, Portland, United States
 
Hellenic Subduction System and Upper-Plate Structures Revealed by Deep High-Resolution Seismic-Reflection Profiles and Seafloor Bathymetry (1885052)
Vasiliki Mouslopoulou1, John Begg1, Alina Polonia2, Andy Nicol Prof3, Timothy J Reston4, Simone Cesca5, Marc Giba6 and Luca Gasperini7, (1)National Observatory of Athens, Institute of Geodynamics, Athens, Greece, (2)CNR Institute for Marine Science, ISMAR, Bologna, Italy, (3)University of Canterbury, Geohazards & Tectonics, Christchurch, New Zealand, (4)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom, (5)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (6)University College Dublin, UCD School of Geological Sciences, Dublin, Ireland, (7)Istituto di Scienze Marine (ISMAR), CNR, Marine Geology, Bologna, Italy
 
Revisiting an Enigma on California's North Coast: The M6.5 Fickle Hill Earthquake of 21 December 1954 (1886303)
Margaret Hellweg1, Thomas A. Lee2, Douglas Dreger1, Anthony Lomax3, Lijam Hagos4, Hamid Haddadi4, Robert C McPherson5, Lori Dengler6, Susan Elizabeth Hough7 and Jason R Patton8, (1)University of California Berkeley, Berkeley Seismology Lab, Berkeley, United States, (2)University of Hawaii, Hilo, Geology Department, Hilo, United States, (3)ALomax Scientific, Mouans-Sartoux, France, (4)California Geological Survey, Sacramento, United States, (5)Cal Poly Humboldt, Arcata, CA, United States, (6)Cal Poly Humboldt, Arcata, United States, (7)U.S. Geological Survey, Earthquake Science Center, Pasadena, United States, (8)California Geological Survey Sacramento, Arcata, CA, United States
 
Expanding the Search for Possible Tectonic Tremor-like Signals Offshore Cascadia (1901291)
Lydia Kelley1, Zoe Krauss2, Hiroto Bito2, Marine Denolle2 and William S D Wilcock1, (1)University of Washington Seattle Campus, School of Oceanography, Seattle, United States, (2)University of Washington Seattle Campus, Department of Earth and Space Sciences, Seattle, United States
 
Sub-daily Imaging of Slow-Slip Events in Cascadia with High-Rate GNSS (1920449)
Ashleigh Mastilak, Organization Not Listed, Washington, DC, United States and Brendan Crowell, University of Washington, Department of Earth and Space Sciences, Seattle, United States
 
Megathrust Structure of the Southern Cascadia Subduction Zone Revealed by Reprocessed Legacy Active-Source Seismic Data (1926391)
Brandon Shuck1, Sean P S Gulick2, Kylie Greiner2, Suzanne M Carbotte3, Nathaniel C Miller4, Janet Tilden Watt5, Jason R Patton6, Anne M Trehu7, Richard W Briggs8 and Brian L Sherrod9, (1)Louisiana State University, Geology & Geophysics, Baton Rouge, United States, (2)University of Texas, Institute for Geophysics, Austin, United States, (3)Lamont-Doherty Earth Observatory, Palisades, NY, United States, (4)USGS, Coastal and Marine Science Center Woods Hole, Woods Hole, MA, United States, (5)U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, United States, (6)California Geological Survey Sacramento, Arcata, CA, United States, (7)Oregon State University, CEOAS, Corvallis, United States, (8)USGS Geologic Hazards Science Center, Golden, United States, (9)USGS Earthquake Science Center, Seattle Field Office, Seattle, United States
 
Seismic Noise Levels of the Three Sisters Volcanic Center, Central Oregon Cascades (1926789)
Mira Knowles, University of California Santa Cruz, Santa Cruz, CA, United States, Yangtianli Zhou, China University of Petroleum, Beijing, China and Brandon Schmandt, Rice University, Houston, United States
 
The Cascadia Offshore Subduction Zone Observatory Infrastructure Project (1927898)
William S D Wilcock1, Michael Harrington2, David A Schmidt3, Deborah Kelley1, Harold J Tobin4, Marine Denolle5, Mika Thompson5, Geoff Cram2, Amanda Labrado2, Matthew Khoo2, Dana Manalang2, Chuck McGuire2, Kira Smith2, James Tilley2, Mark A Zumberge6 and Glenn S Sasagawa7, (1)University of Washington Seattle Campus, School of Oceanography, Seattle, United States, (2)Applied Physics Laboratory University of Washington, Seattle, United States, (3)University of Washington Seattle, Department of Earth and Space Sciences, Seattle, United States, (4)University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States, (5)University of Washington Seattle Campus, Department of Earth and Space Sciences, Seattle, United States, (6)University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, (7)University of California San Diego, Scripps Institution of Oceanography, La Jolla, United States
 
Seismic Data Reprocessing: Southern Cascadia Subduction Zone and Mendocino Triple Junction (1928854)
Kylie Greiner1, Sean P S Gulick1 and Brandon Shuck2, (1)University of Texas, Institute for Geophysics, Austin, United States, (2)Louisiana State University, Geology and Geophysics, Baton Rouge, United States
 
2D Kinematic Restoration of the Outer Accretionary Wedge along the Cascadia Subduction Margin using CASIE21 Seismic Data (1931178)
Ms. Danqi Jiang, University of Texas at Austin, Institute for Geophysics, Jackson School of Geosciences, Austin, United States, Shuoshuo Han, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Suzanne M Carbotte, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Brian Boston, Auburn University, Department of Geosciences, Auburn, AL, United States, Brandon Shuck, Louisiana State University, Geology and Geophysics, Baton Rouge, United States and Harold J Tobin, University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States
 
Validating Seismic Wave Speed Models of the Cascadia Region with Spectral-Element Simulations (1946891)
Ross Maguire, University of Illinois at Urbana Champaign, Department of Earth Science and Environmental Change, Urbana, United States, Jonathan R Delph, Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, Bin He, University of Oregon, Earth Sciences, Eugene, United States, Dr. Arthur J Rodgers, PhD, Lawrence Livermore National Laboratory, Livermore, CA, United States, Rasheed Ajala, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States and Benjamin Fernando, Johns Hopkins University, Baltimore, United States
 
Revisiting Interseismic Coupling at Cascadia: An Assessment of the Impact of Elastic Heterogeneity and Viscoelastic Earthquake Cycles (Invited) (1950826)
Elizabeth M Sherrill, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Kaj M Johnson, Indiana University, Department of Earth and Atmospheric Sciences, Bloomington, United States
 
Shallow Velocity Structure of the Central Cascadia Forearc using Ambient Noise Tomography from a high-density nodal array (1951456)
Shihan Wu1, Bin He2, Jonathan R Delph1 and Emilie E E Hooft, PhD3, (1)Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, (2)University of Oregon, Eugene, United States, (3)University of Oregon, Department of Earth Sciences, Eugene, United States
 
Quantifying permanent strain and surface uplift from relict topography of the Klamath Peneplain (1956849)
William Hefner, University of North Carolina at Chapel Hill, Department of Earth, Marine and Environmental Sciences, Chapel Hill, NC, United States, Eric Kirby, Pennsylvania State University, Department of Geosciences, University Park, United States, Owen Ryerson, University of Massachusetts Amherst, Amherst, United States, John C Gosse, Dalhousie University, Earth and Environmental Sciences, Halifax, NS, Canada and Kirsty A McKenzie, James Madison University, Department of Geology and Environmental Science, Harrisonburg, VA, United States
 
3D frictional and viscous earthquake cycle model of the Cascadia subduction zone (1957454)
Wenqiang Zhang, Stanford University, Department of Geophysics, Stanford, CA, United States, So Ozawa, University of Tokyo, Earthquake Research Institute, Tokyo, Japan and Eric M Dunham, Stanford University, Department of Geophysics, Stanford, United States
 
Advancing Paleogeodesy in Cascadia with New Diatom-Based Transfer Functions (1962573)
Tina Dura1, Eileen Hemphill-Haley2, David Bruce1, Niamh Cahill3, Harvey M Kelsey4, Andrea Hawkes5 and Isabel Hong6, (1)Virginia Polytechnic Institute and State University, Geosciences, Blacksburg, United States, (2)Hemphill-Haley Consulting, Eugene, United States, (3)University of Massachusetts Amherst, Department of Biostatistics and Epidemiology, Amherst, United States, (4)Humboldt State University, Arcata, United States, (5)University of North Carolina at Wilmington, Earth and Ocean Sciences, Wilmington, United States, (6)Central Washington University, Ellensburg, United States
 
Detection of shallow slow slip at the base of the seismically locked zone in Cascadia using Seafloor Optical Fiber Strainmeters (1963827)
Noel M Jackson, University of Kansas, Lawrence, KS, United States and Mark A Zumberge, University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States
 
The Strength of the Sedimentary Wedge Along the Cascadia Subduction Zone (1966312)
Shuoshuo Han, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Juan Pablo Canales, Woods Hole Oceanographic Institution, Geology & Geophysics, Woods Hole, United States, Suzanne M Carbotte, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Demian M. Saffer, The University of Texas at Austin, Institute for Geophysics and Department of Geological Sciences, Jackson School of Geosciences, Austin, United States, Zeyu Zhao, Peking University, School of Earth and Space Sciences, Beijing, China, Hanchao Jian, Peking University, Beijing, China, Michael Everett Mann, Pacific Northwest National Laboratory, Richland, United States, Nathaniel C Miller, USGS, Coastal and Marine Science Center Woods Hole, Woods Hole, MA, United States, Danqi Jiang, University of Texas at Austin, Austin, United States, Brian Boston, Auburn University, Department of Geosciences, Auburn, AL, United States, Harold J Tobin, University of Washington Seattle, Earth and Space Sciences, Seattle, WA, United States, Brandon Shuck, Louisiana State University, Geology and Geophysics, Baton Rouge, United States and Jeffrey W Beeson, Oregon State University, Cooperative Institute for Marine Ecosystem and Resource Studies, Newport, OR, United States
 
Deep Lithospheric Imaging of the Incoming Plates along the Cascadia Subduction Zone from Marine Seismic Data (1967895)
Brian Boston, Auburn University, Auburn, United States, Suzanne M Carbotte, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Shuoshuo Han, University of Texas, Institute for Geophysics, Austin, United States and Brandon Shuck, Louisiana State University, Geology and Geophysics, Baton Rouge, United States
 
The CRESCENT/SCEC/USGS Tsunami Benchmarks: 3D Fully Coupled Earthquake Dynamic Rupture and Tsunami Simulations with Varying Bathymetric Complexity (1969989)
Fabian Kutschera1, Alice-Agnes Gabriel1,2, Eric M Dunham3,4, Ruth Harris5, Michael Barall5, Loïc Bachelot6,7, Shuo Ma8, David Schneller9 and Wenqiang Zhang3, (1)Scripps Institution of Oceanography, University of California San Diego, Institute of Geophysics and Planetary Physics, La Jolla, United States, (2)Ludwig-Maximilians-Universität München, Department of Earth and Environmental Sciences, Munich, Germany, (3)Stanford University, Department of Geophysics, Stanford, United States, (4)Stanford University, Institute for Computational and Mathematical Engineering, Stanford, United States, (5)U.S. Geological Survey, Earthquake Science Center, Moffett Field, United States, (6)University of Oregon, Department of Earth Sciences, Eugene, United States, (7)Cascadia Region Earthquake Science Center, Eugene, United States, (8)San Diego State University, Department of Earth and Environmental Sciences, San Diego, United States, (9)Technische Universität München, Department of Computer Science, Munich, Germany
 
Shallow subseafloor static and dynamic slope stability in Southern Cascadia (1972942)
Ericka Niehaus, Ohio State University Main Campus, Earth Science, Columbus, United States, Derek Sawyer, Ohio State University Main Campus, Earth Science, Columbus, OH, United States, Bailey Fitzgerald, The Ohio State University, Earth Science, Columbus, United States, Jenna C Hill, Coastal Carolina University, Conway, United States and Daniel S Brothers, USGS Pacific Coastal and Marine Science Center, Santa Cruz, United States
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