Browsing by Author "Humphreys, Eugene"

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Dynamics and Imaging of Subduction

O'Driscoll, Leland (University of Oregon, 2012)

Convergent plate boundaries evolve through the dynamic interaction between subducting oceanic lithosphere, overriding lithosphere, and adjacent flow of the convective mantle. These lithospheric plates contain remarkable ...
Geodynamic Origin of the Columbia River Flood Basalts

Perry-Houts, Jonathan (University of Oregon, 2019-04-30)

Tertiary history of the Pacific Northwest is closely tied to that of the Columbia River Flood Basalt (CRB) events. The region is, geologically, one of the least well understood parts of the continental United States. Throughout ...
Kinematic Constraints on Tremor and Slow Slip in Cascadia and Implications for Fault Properties

Krogstad, Randy (University of Oregon, 2016-11-21)

Subduction zone fault processes range from tsunami-generating megathrust events to aseismic creep along the deeper portions of the fault. Episodic tremor and slow slip (ETS) represents the transition between these two ...
Origins of Complex Seismic Anisotropy beneath the Wallowa Mountains, Northeast Oregon

Niday, William (University of Oregon, 2020-02-27)

We use a dense network of observations and an automated method of analysis to investigate complex patterns of seismic anisotropy in eastern Oregon. We present SKS splitting results for approximately 220 broadband seismic ...
Resolving Upper Mantle Seismic Structure Beneath the Pacific Northwest and Inferred Plume-Lithosphere Interactions During the Steens-Columbia River Flood Basalt Eruptions

Darold, Amberlee (University of Oregon, 2012)

Cenozoic tectonics of the Pacific Northwest (PNW) and the associated mantle structures are remarkable, the latter revealed by EarthScope seismic data. In this thesis we model teleseismic body waves constrained by ambient-noise ...
Spatial Distribution of Shallow Crustal Anisotropy from Shear Wave Splitting Measurements at the Endeavour Segment of the Juan de Fuca Ridge

Araragi, Kohtaro (University of Oregon, 2012)

We investigate upper crustal anisotropy of the Endeavour Segment of the Juan de Fuca Ridge using shear wave splitting measurements of ~3000 earthquakes recorded during three years using the Keck seafloor seismic network. ...
The Dynamic Interplay between Miocene to post-Miocene Magmatism, Tectonism, and Geomorphology in NE Oregon

Morriss, Matthew (University of Oregon, 2020-12-08)

The Miocene to post-Miocene geologic history of Northeastern Oregon and West-Central Idaho is difficult to parse because this area has experienced several dramatic events. Within 35 km of each other, there are exposures ...