T034
Multidisciplinary Investigations of the Aleutian-Alaska Subduction Zone

Session ID#: 72464

Session Description:
The Aleutian-Alaska subduction zone (AASZ) is marked by lateral variations in the subducting and overriding plates, subduction obliquity, magma composition, and eruption frequency. It is home to 54 historically active volcanoes, a volcanic gap associated with flat slab subduction, and abundant subduction-related seismicity.The AASZ is an ideal place to address a variety of subduction-related questions, most effectively through cross-disciplinary collaborations. This AGU session aims to facilitate sharing of new data and results across disciplines to help elucidate AASZ processes including but not limited to characteristics of the slab; seismogenesis and fault slip behavior; upper plate deformation processes; magma generation, fluid/volatile transport, and eruption processes; and linkages between processes. We invite contributions investigating the AASZ involving geology, geophysics, geochemistry, volcanology, rock physics, geochronology, tectonics, and geodynamics, with a particular interest in studies integrating results from multiple disciplines and/or across scales.
Co-Organized:
  • MR - Mineral and Rock Physics
  • S - Seismology
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

1037 Magma genesis and partial melting [GEOCHEMISTRY]
8170 Subduction zone processes [TECTONOPHYSICS]
8178 Tectonics and magmatism [TECTONOPHYSICS]
8185 Volcanic arcs [TECTONOPHYSICS]

Primary Convener:  Xiaotao Yang, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
Conveners:  Tamara N. Jeppson, Texas A&M University College Station, Department of Geology and Geophysics, College Station, TX, United States, Julie Elliott, Purdue University, Department of Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States and Daniel J. Rasmussen, Lamont -Doherty Earth Observatory, Department of Earth & Environmental Sciences, Palisades, NY, United States
Primary Liaison:  Xiaotao Yang, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
 
Role of the Aleutian Arc and NW Pacific seafloor in Pacific-wide plate reorganization in the Paleogene (487584)
Kaj Hoernle1, Brian R Jicha2, Dietmar Müller3, Maxim Portnyagin1, Reinhard Werner1, Folkmar Hauff1, Rachel Bezard4, Tobias Walter Höfig5 and Gene Yogodzinski6, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)University of Wisconsin Madison, Madison, WI, United States, (3)Univ Sydney, EarthByte Group, School of Geosciences, Sydney, Australia, (4)University of Tübingen, Tübingen, Germany, (5)Texas A&M University, International Ocean Discovery Program, College Station, TX, United States, (6)University of South Carolina, Columbia, SC, United States
 
The Aleutian-Alaska Subduction Zone: An Unparalleled Natural Laboratory for Understanding Arc Volcanic Processes (Invited) (495528)
Jessica F Larsen, University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States
 
Bayesian inversion of Sp and Ps phases and Rayleigh waves for lithospheric and asthenospheric structure beneath Alaska (499444)
Isabella Gama1, Karen M. Fischer2, Zachary Eilon3, Hannah Elaine Krueger1, Colleen A Dalton4 and Lucy M Flesch5, (1)Brown University, Providence, RI, United States, (2)Brown University, Dept. of Earth, Environmental and Planetary Sciences, Providence, RI, United States, (3)University of California Santa Barbara, Santa Barbara, CA, United States, (4)Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States, (5)Purdue University, West Lafayette, IN, United States
 
Crust and Uppermost Mantle Structure of the Alaska Subduction Zone from Ambient Noise Tomography (500649)
Zongshan Li1, Douglas Wiens1 and Weisen Shen2, (1)Washington University in St Louis, St. Louis, MO, United States, (2)Stony Brook University, Department of Geosciences, Stony Brook, NY, United States
 
Along-strike segmentation of intermediate-depth seismicity along the Alaska Peninsula and implications for slab dehydration (503729)
Songqiao Shawn Wei, Michigan State University, Department of Earth and Environmental Sciences, East Lansing, MI, United States, Sydney Lauren Gable, Michigan State University, East Lansing, MI, United States, Natalia A Ruppert, Univ Alaska Fairbanks, Fairbanks, AK, United States and Haijiang Zhang, University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China
 
Along-strike variations in b-value for subduction zone earthquakes at the Alaska Peninsula (507445)
Sydney Lauren Gable, Michigan State University, East Lansing, MI, United States and Songqiao Shawn Wei, Michigan State University, Department of Earth and Environmental Sciences, East Lansing, MI, United States
 
Mantle Flow Systems Associated with Slab Subduction and Absolute Plate Motion in Alaska: Constraints from Shear Wave Splitting Analyses (508705)
Yuchen Yang, Stephen S Gao and Kelly Hong Liu, Missouri University of Science and Technology, Geology and Geophysics Program, Rolla, MO, United States
 
The Role of Variable Slab Dip in Driving Mantle Flow at the Eastern Edge of the Alaskan Subduction Margin: Insights From Shear-Wave Splitting (519821)
Clothilde Venereau1,2, Robert Martin-Short3, Ian D Bastow4, Richard M Allen5 and Rita Kounoudis4, (1)Imperial College London, London, SW7, United Kingdom, (2)University of California Berkeley, Berkeley, United States, (3)Imperial College London, London, United Kingdom, (4)Imperial College London, Department of Earth Science and Engineering, London, United Kingdom, (5)Univ California Berkeley, Berkeley, CA, United States
 
Oblique subduction at the end of the Aleutian slab beneath the Wrangell Volcanic Field (Invited) (536525)
Geoffrey A Abers1, Michael Everett Mann1, Kiara Andrea Daly1, Roque Alberto Soto Castaneda1 and Douglas H Christensen2, (1)Cornell University, Ithaca, NY, United States, (2)Univ Alaska Fairbanks, Fairbanks, AK, United States
 
Using trace metal ratios in volcanic glass for Aleutian tephrochronology (551781)
Dayana Manrique1, Matthieu Chicoye1, Madeline V Rawson1, Kristina J Walowski2, Jason A Addison3, Alan Mix4 and Mea S Cook1, (1)Williams College, Geosciences, Williamstown, MA, United States, (2)Middlebury College, Geology, Middlebury, VT, United States, (3)USGS, Geology, Minerals, Energy, & Geophysics Science Center, Menlo Park, CA, United States, (4)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States
 
A Wadati-Benioff Zone Beneath the Wrangell Volcanic Field Revealed by the WVLF Broadband Array (554229)
Kiara Andrea Daly1, Geoffrey A Abers1, Michael Everett Mann1, Steven W Roecker2 and Douglas H Christensen3, (1)Cornell University, Ithaca, NY, United States, (2)Rensselaer Polytechnic Inst, Earth & Environmental Sciences, Troy, NY, United States, (3)Univ Alaska Fairbanks, Fairbanks, AK, United States
 
The 30 November 2018 Mw7.1 Anchorage Earthquake (554720)
Michael Edwin West1, Adrian Bender2, Matt Gardine1, Lea Gardine3, Kara Gately4, Peter J Haeussler5, Wael Hassan6, Franz Josef Meyer7, Cole Richards8, Natalia A Ruppert9, Carl Tape8, John Thornley10 and Robert Carleton Witter2, (1)University of Alaska Fairbanks, Fairbanks, AK, United States, (2)USGS Alaska Science Center, Anchorage, AK, United States, (3)University of Alaska Fairbanks, Alaska Earthquake Center, Fairbanks, AK, United States, (4)NOAA National Weather Service, Palmer, AK, United States, (5)USGS, Anchorage, AK, United States, (6)University of Alaska Anchorage, Anchorage, United States, (7)University of Alaska Fairbanks Geophysical Institute, Fairbanks, AK, United States, (8)University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States, (9)Univ Alaska Fairbanks, Fairbanks, AK, United States, (10)Golder Associates, Inc., Anchorage, AK, United States
 
New Constraints on Volcanic Inflation and Slip Deficit on the Plate Interface at Mt. Veniaminof, Alaska from Repeat GPS Measurements (557607)
Connor Drooff, Michigan State University, East Lansing, MI, United States
 
A rich variation of earthquake behavior and their interplay in the Alaska-Aleutian subduction zone (562227)
Abhijit Ghosh, University of California Riverside, Riverside, CA, United States and Bo LI, Ludwig Maximilians University of Munich, Munich, Germany
 
Magmatic Clues to the Distinctive Tertiary Evolution of the Attu Region of the Western Aleutian Arc (562378)
Suzanne Mahlburg Kay1, Brian R Jicha2, Gene Yogodzinski3 and Ashley K Tibbetts1, (1)Cornell University, Ithaca, NY, United States, (2)University of Wisconsin Madison, Madison, WI, United States, (3)University of South Carolina, Columbia, SC, United States
 
High-resolution receiver function imaging of crustal structure and subduction across Southcentral Alaska (584582)
Michael Everett Mann1, Geoffrey A Abers1, Kiara Andrea Daly1 and Douglas H Christensen2, (1)Cornell University, Ithaca, NY, United States, (2)Univ Alaska Fairbanks, Fairbanks, AK, United States
 
Shear Wave Velocity Structure Beneath Alaska from Rayleigh Wave Amplification and Phase Velocity (589036)
Benjamin Davidson1, Jordyn C Babikoff2 and Colleen A Dalton2, (1)Luther College, Physics, Decorah, IA, United States, (2)Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States
 
The spatial occurrence of Double Benioff Zones along the Aleutian-Alaska subduction zone based on nested regional-global seismic tomography and precise earthquake relocation (595360)
Farzaneh Aziz Zanjani, University of Miami, Marine Geosciences, Miami, FL, United States, Guoqing Lin, Department of Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States and Clifford H Thurber, University of Wisconsin Madison, Madison, WI, United States
 
Shear Wave Anisotropy in the Alaska Subduction Zone Inferred from S-wave Splitting and SKS-splitting (595524)
Cole Richards, University of Alaska Fairbanks, Fairbanks, AK, United States, Carl Tape, University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States and Zachary E. Ross, California Institute of Technology, Pasadena, CA, United States
 
Controls on Overriding Plate Deformation in South-central Alaska: Flat Slab versus Oceanic Plateau Subduction (596457)
Kirstie L. Haynie, University at Buffalo, Buffalo, NY, United States and Margarete Ann Jadamec, University at Buffalo, Geology, Buffalo, NY, United States
 
A 400-node linear array crossing the Denali fault and Alaska subduction zone (618254)
Kevin Michael Ward1, Santiago Rabade2, Cole Richards3, Carl Tape3 and Amir A Allam2, (1)South Dakota School of Mines and Technology, Rapid City, SD, United States, (2)University of Utah, Department of Geology & Geophysics, Salt Lake City, UT, United States, (3)University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States
 
Trenchward Migrating Megathrust Splay Faults in Junken Trough, Alaska (620621)
Peter J Haeussler, USGS Alaska Science Center, Anchorage, AK, United States, Daniel S Brothers, U.S. Geological Survey, Santa Cruz, CA, United States and Lee M Liberty, Boise State Univ, Boise, ID, United States
 
Upper Plate Motion, Slab Geometry, and Slip Behavior Along the Eastern Alaska Subduction Zone (622302)
Julie Elliott, Purdue University, Department of Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States and Jeffrey Todd Freymueller, Michigan State University, Earth and Environmental Sciences, East Lansing, MI, United States
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