Sponsor
Portland State University. Department of Earth Sciences
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).
Persistent Identifier
https://archives.pdx.edu/ds/psu/16402
Recommended Citation
Jones, Terry Dean, "Analysis of a Gravity Traverse South of Portland, Oregon" (1977). Dissertations and Theses. Paper 2616.
https://doi.org/10.15760/etd.2612
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.