GSA Annual Meeting in Seattle, Washington, USA - 2017

Session No. 247
Tuesday, 24 October 2017: 1:30 PM-5:30 PM
Tahoma 5 (The Conference Center)

T222. Decadal to Millennial Strain Accumulation at Subduction Zones

GSA Structural Geology and Tectonics Division; Future of Tectonics Initiative
Christine Regalla, Kristin Morell, Scott Bennett, Lucinda J. Leonard, Colin B. Amos and John P. Loveless, Advocates
1:30 PM
IMPORTANCE OF VISCOELASTIC STRESS RELAXATION IN BOTH POSTSEISMIC AND INTERSEISMIC DEFORMATION (Invited Presentation)
WANG, Kelin1, SUN, Tianhaozhe1 and LI, Shaoyang2, (1)School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8P 5C2, Canada, (2)Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, 14473, Germany, kelin.wang@canada.ca
1:45 PM
INTERPLATE LOCKING AND DISSIPATION OF VISCOELASTIC POST-SEISMIC DISPLACEMENT OF THE 1960 VALDIVIA, CHILE, EARTHQUAKE
RUSSO, R.M., Department of Geological Sciences, University of Florida, P.O. Bos 112120, 241 Williamson Hall, Gainesville, FL 32611, AMBROSIUS, Boudeiwjn A.C., Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, Delft, 2629 HS, Netherlands, MOCANU, Victor, Department of Geophysics, University of Bucharest, 6, Traian Vuia Street, RO-020956 Bucharest 2, RO-020956, Romania and FERNANDES, Rui, University of Beira Interior, Instituto D. Luiz, Rua Marquês d'Ávila e Bolama, Covilhã, 6201-001, Portugal, rmrusso2010@gmail.com
2:00 PM
HOW MANY M9 EARTHQUAKES ARE POSSIBLE? INTERSEISMIC COUPLING AND RUPTURE PATCH MAGNITUDES ALONG 15 OF THE WORLD’S SUBDUCTION ZONES
GRAHAM, Shannon E., Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St, Cambridge, MA 02138; Department of Earth and Environmental Sciences, Boston College, Devlin Hall 213, 140 Commonwealth Avenue, Chestnut Hill, MA 02467, LOVELESS, John P., Department of Geosciences, Smith College, Clark Science Center, 44 College Lane, Northampton, MA 01063 and MEADE, Brendan J., Earth & Planetary Sciences, Harvard University, 20 Oxford St, Cambridge, MA 02138, shannonegraham@fas.harvard.edu
2:15 PM
SPECTRUM OF MEGATHRUST SLIP BEHAVIOR RECORDED WITHIN ANCIENT ACCRETIONARY COMPLEXES: THE ROLE OF SILICA REDISTRIBUTION
FISHER, Donald M.1, SMYE, Andrew J.2, MARONE, Chris3, VAN KEKEN, Peter4, YAMAGUCHI, Asuka5, OAKLEY, David6 and RAMIREZ, Gabrielle1, (1)Department of Geosciences, Pennsylvania State University, University Park, PA 16802, (2)Department of Geosciences, The Pennsylvania State University, University Park, PA PA 16802, (3)Department of Geosciences, Penn State, Deike Building, University Park, PA 16802, (4)b- Department of Terrestial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington, DC, 20015, (5)Tokyo University of Marine Science and Technology, Tokyo, 108-8477, Japan, (6)Geosciences, The Pennsylvania State University, 303 Deike Building, University Park, PA 16801, dmf6@psu.edu
 
2:30 PM
Break
2:45 PM
ISOLATING LONG-TERM TRANSIENTS IN CASCADIA GPS DATA USING A SEASONAL-TREND DECOMPOSITION PROCEDURE
NUYEN, Carolyn, Earth and Space Sciences, University of Washington, Seattle, WA 98195 and SCHMIDT, David, Department of Earth and Space Sciences, University of Washington, Seattle, WA 351310, cnuyen@uw.edu
3:00 PM
PBO BOREHOLE STRAINMETERS OBSERVE OVER A DECADE OF EPISODIC TREMOR AND SLIP ALONG THE CASCADIA SUBDUCTION ZONE: SOUTHERN VANCOUVER ISLAND, BC, CANADA THROUGH OLYMPIA, WA, USA
VAN BOSKIRK, Elizabeth1, HODGKINSON, Kathleen1, GOTTLIEB, Mike1, JOHNSON, Wade2, HENDERSON, Brent3, MENCIN, David1 and MATTIOLI, Glen S.4, (1)UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301, (2)PBO, UNAVCO, 6350 Nautilus Dr, Boulder, CO 80301, (3)PBO Data, IRIS PASSCAL Instrument Center, New Mexico Tech, 100 East Road, Socorro, NM 87801, (4)Geodetic Infrastructure and Earth & Env. Sciences, UNAVCO, Inc. and University of Texas at Arlington, 6350 Nautilus Dr, Boulder, CO 80301-5394, boskirk@unavco.org
3:15 PM
HIDDEN EARTHQUAKE POTENTIAL IN PLATE BOUNDARY TRANSITION ZONES
FURLONG, Kevin P., Department of Geosciences, Pennsylvania State University, 542 Deike Building, University Park, PA 16802, kevin@geodyn.psu.edu
3:30 PM
RATES AND MECHANISMS OF ACTIVE FAULTING AND FOLDING IN THE TRANSITION FROM HIKURANGI SUBDUCTION TO NORTH CANTERBURY TRANSPRESSION, SOUTH ISLAND, NEW ZEALAND (Invited Presentation)
OAKLEY, David O.S., Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, FISHER, Donald M., Department of Geosciences, Pennsylvania State University, University Park, PA 16802, GARDNER, Thomas W., Geosciences Department, Trinity University, San Antonio, TX 78212, BARNES, Philip M., National Institute of Water and Atmospheric Research, 301 Evans Bay Parade, Greta Point, Wellington, 6021, New Zealand, GHISETTI, Francesca C., TerraGeoLogica, Ruby Bay, 7005, New Zealand and VANDERLEEST, Rebecca A., Center for Integrative Geosciences, University of Connecticut, Storrs, CT 06269, doo110@psu.edu
 
3:45 PM
Break
4:00 PM
A LATE CENOZOIC KINEMATIC MODEL FOR FAULT MOTION WITHIN THE GREATER CASCADIA SUBDUCTION SYSTEM (Invited Presentation)
MCCRORY, Patricia A., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 and WILSON, Douglas S., Department of Earth Science, University of California, Santa Barbara, CA 93106, pmccrory@usgs.gov
4:15 PM
RECONCILING CASCADIA FOREARC LONG-TERM DEFORMATION MODELS
ALDRICH, M. James, Los Alamos National Laboratory (Retired), 741 Brigadoon Boulevard, Sequim, WA 98382-8167, mjaldrich@olypen.com
4:30 PM
RELATIONSHIP BETWEEN SLIP ON THE LAKE CREEK-BOUNDARY CREEK FAULT SYSTEM, NORTHERN OLYMPIC PENINSULA, AND THE UNDERLYING CASCADIA SUBDUCTION ZONE
LOVELESS, John P.1, SCHERMER, Elizabeth2, AMOS, Colin B.2, DUCKWORTH, Cody2 and GEORGE, Orion3, (1)Department of Geosciences, Smith College, Clark Science Center, 44 College Lane, Northampton, MA 01063, (2)Geology Department, Western Washington University, 516 High St. MS 9080, Bellingham, WA 98225, (3)Department of Transportation, Western Federal Lands Highway Division, 610 E 5th St., Vancouver, WA 98661, jloveles@smith.edu
4:45 PM
GEOMORPHIC EVIDENCE FOR DIFFERENTIAL ROCK UPLIFT ACROSS THE SOUTHERN CASCADIA FOREARC
VON DASSOW, Wesley A., College of Earth Ocean and Atmospheric Sciences, Oregon State University, 2601 SW Orchard Ave, Corvallis, OR 97330 and KIRBY, Eric, Oregon State University, College of Earth, Ocean and Atmospheric Sciences, 104 CEOAS Admin, Corvallis, OR 97331, vondassw@oregonstate.edu
5:00 PM
PERMANENT FOREARC STRAIN IN NORTHERN CHILE
ALLMENDINGER, Richard W., Department of Earth and Atmospheric Sciences, Cornell University, Snee Hall, Ithaca, NY 14853-1504 and GONZÁLEZ, Gabriel, Departamento de Ciencias Geológicas, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile, rwa1@cornell.edu
5:15 PM
SLIP INVERSION IN THE FOREARC OF TOHOKU JAPAN, OVER MULTIPLE TIME SCALES
REGALLA, Christine, Earth and Environment, Boston University, 685 Commonwealth Ave, Rom 130, Boston, MA 02215, FISHER, Donald M., Department of Geosciences, Pennsylvania State University, University Park, PA 16802, KIRBY, Eric, Oregon State University, College of Earth, Ocean and Atmospheric Sciences, 104 CEOAS Admin, Corvallis, OR 97331 and OAKLEY, David O.S., Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, cregalla@bu.edu
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