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.
|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|
|Keywords:||Newberry volcano, Secondary, Seismic, Tomography, Volcanos|
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