Dissertation/Thesis Abstract

The upper crustal P-wave velocity structure of Newberry volcano, Central Oregon
by Beachly, Matthew William, M.S., University of Oregon, 2011, 110; 1497098
Abstract (Summary)

The upper-crustal seismic-velocity structure of Newberry volcano, central Oregon, is imaged using P-wave travel time tomography. The inversion combines a densely-spaced seismic line collected in 2008 with two USGS seismic experiments from the 1980s. A high-velocity ring (7 km EW by 5 km NS) beneath the inner caldera faults suggests an intrusive ring complex 200 to 500 m thick. Within this ring shallow low velocities (<2 km depth) are interpreted as caldera fill and a subsided block. High velocities below 2 km depth could be intrusive complexes. There appears to be a low-velocity body at 3-6 km depth beneath the center of the volcano. This region is poorly resolved in the inversion because the ray paths bend around the low-velocity body. The 2008 data also recorded a secondary arrival that may be a delayed P-wave interacting with the low-velocity body.

Indexing (document details)
Advisor: Hooft, Emilie E. E.
Commitee: Cashman, Katharine V., Toomey, Douglas R.
School: University of Oregon
Department: Department of Geological Sciences
School Location: United States -- Oregon
Source: MAI 50/01M, Masters Abstracts International
Source Type: DISSERTATION
Subjects: Geophysics
Keywords: Newberry volcano, Secondary, Seismic, Tomography, Volcanos
Publication Number: 1497098
ISBN: 9781124793306
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