Seismic Imaging of the Westward Transition From Yakutat to Pacific Subduction in Southern Alaska

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Millet, Florian, Rondenay, Stéphane, Bodin, Thomas, Tape, Carl
• Other Authors: Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2023
• Subjects: [PHYS]Physics [physics]; Yakutat; Alaska
• Online Access: https://cnrs.hal.science/hal-04313023; https://cnrs.hal.science/hal-04313023/document; https://cnrs.hal.science/hal-04313023/file/Geochem%20Geophys%20Geosyst%20-%202023%20-%20Millet%20-%20Seismic%20Imaging%20of%20the%20Westward%20Transition%20From%20Yakutat%20to%20Pacific%20Subduction%20in.pdf; https://doi.org/10.1029/2022gc010374

• We apply a multi-mode 3D Kirchhoff migration to a new composite seismic data set from six arrays deployed in Alaska from 2000 to 2018 • We observe a sharp lateral boundary in the slab structure with a 10 km Moho step just offshore Anchorage from the Pacific to the Yakutat slab • Our observations suggest that the crust is still partially uneclogitized down to 150 km depth in both slabs