Three-dimensional seismic velocity structure of the northwestern United States

Details Three-dimensional seismic velocity structure of the northwestern United States Three-dimensional seismic velocity structure of the northwestern United States

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515304r&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15304

Physics

31

Tectonophysics: Hotspots, Large Igneous Provinces, And Flood Basalt Volcanism, Seismology: Tomography (6982, 8180), Seismology: Body Waves, Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413), Tectonophysics: Continental Margins: Convergent

Scientific paper

We present a high-resolution, three dimensional, P-wave tomography model for the northwestern United States. Major features of the model include clear, well-resolved images of the Juan de Fuca-Gorda slab to depths of at least 500 km, reduced velocities beneath Newberry volcano and north-central Oregon, increased velocities beneath the Idaho batholith, and a deep, slab-like, eastward-dipping feature of increased velocities beneath Nevada. We find no evidence for a mantle plume in this region, and demonstrate that suggested disruption of the Juan de Fuca slab beneath Oregon in the vicinity of Newberry volcano is an inversion artifact. We interpret the primary features of this new model within the framework of post-Laramide tectonomagmatism and the continuing tectonic evolution of the Cascadia Subduction Zone. A model explaining the regional tectonomagmatic history consistent with the imaged seismic velocity structure is one driven by mantle flow responding to the evolving subduction system.

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