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   https://doi.org/10.1063/1.5144914  

   Heim, Zachary N. ; Amberger, Brent K. ; Esselman, Brian J. ; Stanton, John F. ; Woods, R. Claude ; McMahon, Robert J. ( March 2020 , The Journal of Chemical Physics)
2. Upper Crustal Structure and Magmatism in Southwest Washington: V p , V s , and V p / V s Results From the iMUSH Active‐Source Seismic Experiment

   https://doi.org/10.1029/2018JB016203  

   Kiser, E. ; Levander, A. ; Zelt, C. ; Schmandt, B. ; Hansen, S. ( July 2019 , Journal of Geophysical Research: Solid Earth)

   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 forV_p,V_s, andV_p/V_smodels 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 lowV_p/V_sanomaly 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 highV_pandV_p/V_sbodies. TheV_p/V_smodel shows relatively highV_p/V_sregions 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 highV_pandV_sbodies. 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.

    

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