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Filtering by: Subject Geology, Structural Language English [eng] Subject Geology, Structural -- Oregon

The case for NE-SW extension in northeast Oregon

Creator:

Essman, Jim E.

Abstract:

A zone of diffuse deformation -600 km-wide extending from northern California to Washington has developed resulting from the oblique subduction of the Juan de Fuca plate beneath North America, and the northwestward migration of the Pacific plate. This zone is marked by a change in structural style from transtension in...

Resource Type:

Masters Thesis
Evolution of the Corvallis fault and implications for the Oregon coast range

Creator:

Goldfinger, Chris

Abstract:

The Corvallis fault is a 50 km long northeast-trending structure, part of which defines the boundary between the central Willamette Valley and the east-central Coast Range of Oregon. Previously the fault had been mapped as either a high-angle reverse or normal fault, with the east block down. New gravity data...

Resource Type:

Masters Thesis
Structure and tectonics of the southern Willamette Valley, Oregon

Creator:

Graven, Erik P.

Abstract:

Surface geology, seismic data, petroleum exploratory well data, and water well data have been used to analyze the structural and tectonic history of the southern Willamette Valley. Tertiary strata beneath the southern Willamette Valley appear to have had an early Cascade or Clarno volcanic source to the east by the...

Resource Type:

Masters Thesis
I. Direction of maximum horizontal compression in western Oregon determined by borehole breakouts. II. Structure and tectonics of the northern Willamette Valley, Oregon

Creator:

Werner, Kenneth Stefan

Abstract:

Elliptical borehole enlargements or "breakouts" caused by systematic spalling of a borehole wall due to regional maximum horizontal stresses were identified in 18 wells drilled in the Coast Range and Willamette Valley of western Oregon. The breakouts generally indicate a NNW to NNE orientation of maximum horizontal compression (oH[subscript max])...

Resource Type:

Masters Thesis