dc.contributor.author |
Beachly, Matthew William, 1986- |
|
dc.date.accessioned |
2011-08-04T22:11:58Z |
|
dc.date.available |
2011-08-04T22:11:58Z |
|
dc.date.issued |
2011-06 |
|
dc.identifier.uri |
http://hdl.handle.net/1794/11475 |
|
dc.description |
xii, 98 p. : ill. (some col.) |
en_US |
dc.description.abstract |
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. |
en_US |
dc.description.sponsorship |
Committee in charge: Emilie E.E. Hooft, Chairperson;
Douglas R. Toomey, Member;
Katharine V. Cashman, Member |
en_US |
dc.language.iso |
en_US |
en_US |
dc.publisher |
University of Oregon |
en_US |
dc.relation.ispartofseries |
University of Oregon theses, Dept. of Geological Sciences, M.S., 2011; |
|
dc.subject |
Geophysics |
en_US |
dc.subject |
Arrival |
en_US |
dc.subject |
Newberry Volcano (Or.) |
en_US |
dc.subject |
Secondary |
en_US |
dc.subject |
Seismic |
en_US |
dc.subject |
Tomography |
en_US |
dc.subject |
Volcanoes |
en_US |
dc.title |
The Upper Crustal P-wave Velocity Structure of Newberry Volcano, Central Oregon |
en_US |
dc.type |
Thesis |
en_US |