First Advisor

Ansel G. Johnson

Term of Graduation

Spring 1977

Date of Publication

6-3-1977

Document Type

Thesis

Department

Earth Science

Language

English

Subjects

Gravity -- Oregon -- Portland Region, Faults (Geology) -- Oregon -- Portland region, Structural Faults (Geology)

DOI

10.15760/etd.2612

Physical Description

1 online resource (51, [52] pages)

Abstract

The state gravity maps of Oregon and Washington show a gravity high centered south of Portland, Oregon and a gravity low in the Tualatin Valley to the west disrupting the regional gravity gradient which is controlled by crustal thickening. Detailed gravity surveys done in the Portland area are consistent with the state gravity maps but show considerably more detail. Quantitative interpretation of this data has provided new information on the subsurface structure in this area; recent work has yielded corroborative evidence for a fault zone bounding the east side of the Portland Hills, and has indicated the presence of faults under the Portland Basin to the east which were previously unknown.

In order to extend this work and examine the structural features to the south of the Portland area a detailed gravity survey was conducted along a line perpendicular to the Portland Hills trend between Oak Grove and Milwaukie. This line crosses the northern portion of the circular gravity high present in the state Bouguer gravity map, and the projected trend of the Portland Hills Fault zone allowing a more detailed examination of these features in this area.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

Comments

A thesis submitted in partial fulfillment of the requirements for the University Scholars Program Degree, Bachelor of Science in Earth Science.

If you are the rightful copyright holder of this dissertation or thesis and wish to have it removed from the Open Access Collection, please submit a request to pdxscholar@pdx.edu and include clear identification of the work, preferably with URL.

Persistent Identifier

https://archives.pdx.edu/ds/psu/16402

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Geology Commons

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