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    Upper Crustal Structure and Magmatism in Southwest Washington: Vp, Vs, and Vp/Vs Results From the iMUSH Active‐Source Seismic Experiment

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    Name:
    Kiser_et_al-2019-Journal_of_Ge ...
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    Author
    Kiser, E.
    Levander, A.
    Zelt, C.
    Schmandt, B.
    Hansen, S.
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2019-07-25
    Keywords
    Mount St
    Helens
    iMUSH
    travel time tomography
    Siletzia
    Southern Washington Cascades Conductor
    Indian Heaven Volcanic Heaven
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Kiser, E., Levander, A., Zelt, C., Schmandt, B., & Hansen, S. (2019). Upper crustal structure and magmatism in southwest Washington: Vp,Vs, and Vp/Vs results from the iMUSH active‐source seismic experiment. Journal of Geophysical Research: Solid Earth, 124, 7067–7080. https://doi.org/10.1029/2018JB016203
    Journal
    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
    Rights
    Copyright © 2019. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Structural details of the crust play an important role in controlling the distribution of volcanic activity in arc systems. In southwest Washington, several different regional structures associated with accretion and magmatism have been invoked to explain the broad distribution of Cascade volcanism in this region. In order to image these regional structures in the upper crust, Pg and Sg travel times from the imaging Magma Under St. Helens (iMUSH) active-source seismic experiment are inverted for V-p, V-s, and V-p/V-s models in the region surrounding Mount St. Helens. Several features of these models provide new insights into the regional structure of the upper crust. A large section of the Southern Washington Cascades Conductor is imaged as a low V-p/V-s anomaly that is inferred to represent a broad sedimentary/metasedimentary sequence that composes the upper crust in this region. The accreted terrane Siletzia is imaged west of Mount St. Helens as north/south trending high V-p and V-p/V-s bodies. The V-p/V-s model shows relatively high V-p/V-s regions near Mount St. Helens and the Indian Heaven Volcanic Field, which could be related to the presence of magmatic fluids. Separating these two volcanic regions below 6-km depth is a northeast trending series of high V-p and V-s bodies. These bodies have the same orientation as several volcanic/magmatic features at the surface, including Mount St. Helens and Mount Rainier, and it is argued that these high-velocity features are a regional-scale group of intrusive bodies associated with a crustal weak zone that focuses magma ascent.
    Note
    6 month embargo; published online: 25 July 2019
    ISSN
    2169-9313
    DOI
    10.1029/2018jb016203
    Version
    Final published version
    Sponsors
    National Science Foundation [EAR-1144455, EAR-1445937, EAR-1545750]
    ae974a485f413a2113503eed53cd6c53
    10.1029/2018jb016203
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