Index Catalog // ScholarsArchive@OSU

Long wavelength gravity anomalies and implications concerning a descending lithospheric slab in the Pacific Northwest

Creator:: MacFarlane, William Thomas
Abstract:: The thermal regime of a postulated descending lithospheric slab is calculated. The gravity anomaly associated with such a structure is large in amplitude and long in wavelengh. Observed free-air gravity anomalies in the Pacific Northwest do not indicate a gravitational effect due to a descending slab. Two hypothetical compensation models...
Resource Type:: Dissertation
Full Text:: the data. I thank Mr. D. Eggers for his enthusiasm and helpful discussions. Mr. Ken Keeling acted as

Crustal structure and thermal gradients of the northern Gulf of California determined using spectral analysis of magnetic anomalies

Creator:: Zamora, Osvaldo Sanchez
Abstract:: Geophysical surveys in the Gulf of California provided the data to construct contour maps of bathymetry, free-air anomalies and total field magnetic anomalies for the area north of 27° N. Major faults such as the Ballenas- Salsipuedes, Tiburón, Guaymas, and the South Cerro Prieto are clearly observable on these maps....
Resource Type:: Dissertation
Full Text:: clearly observable on these maps. Spectral analysis, using 2-D Fast Fourier Transform methods, of the

Structure of the Panama Basin from marine gravity data

Creator:: Barday, Robert James
Abstract:: In order to quantitatively examine the crustal structure of the Panama Basin without the benefit of local seismic refraction data, the following assumptions were made: (1) No significant lateral changes in density take place below a depth of 50 km. (2) The densities of the crustal layers are those of...
Resource Type:: Masters Thesis
Full Text:: : STRUCTURE OF THE PANAMA BASIN FROM MARINE GRAVITY DATA Abstract approved: Richard W. Couch In order to

Crustal structure of the northwestern continental margin of the Indian subcontinent from gravity and magnetic data

Creator:: Soofi, Muhammad Asif
Abstract:: The continental margin off the coast of Pakistan between the Murray ridge and the Gulf of Cambay has been studied in this work using gravity, magnetic and bathymetric data. Two dimensional gravity and magnetic models based on free-air gravity and residual magnetic data are developed along a north-south profile off...
Resource Type:: Masters Thesis
Full Text:: : -______ ___ Dr. Richard W. Couch The continental margin off the coast of Pakistan between the Murray

Gravity and structure of the Pacific continental margin of Central Mexico

Creator:: Sanchez Zamora, Osvaldo
Abstract:: Data collected by personnel of the Geophysics Group at Oregon State University and the Instituto Oceanografico of the Direccion General dé Oceanografia are used to construct a free-air anomaly map for the central part of the Pacific continental margin of Mexico, which shows the gravity expression of major structural features...
Resource Type:: Masters Thesis
Full Text:: CONTINENTAL MARGIN OF CENTRAL MEXICO Abs tract approved: Richard W. Couch Data collected by personnel of

Crustal structure and faulting of the Gulf of California from geophysical modeling and deconvolution of magnetic profiles

Creator:: Doguin, Pierre
Abstract:: Using gravity, magnetic, bathymetric and seismic refraction data, I have constructed a geophysical cross-section of the central part of the northern Gulf of California. The section exhibits a crustal thickness of 18 km and features an anomalous block of high density lower basement (3.15 g/cm³) which probably resulted from rifting...
Resource Type:: Masters Thesis
Full Text:: densities (D) for the three seismic refraction stations used to constrain this model, as well as values for

Structures of the continental margin of Central America from northern Nicaragua to northern Panama

Creator:: Victor, Linda
Abstract:: Gravity and seismic data obtained by the geophysical group at Oregon State University on the R/V YAQUINA during 1969, 1971, and 1973 plus other available data over the area just west of Nicaragua and Costa Rica indicate the tectonic complexity of the region. Gravity measurements show negative free-air anomalies over...
Resource Type:: Masters Thesis
Full Text:: CENTRAL AMERICA FROM NORTHERN NICARAGUA TO NORTHERN PANAMA Abstract approved: Richard W. Couch Gravity

Crustal structures and tectonism in southeastern Alaska and western British Columbia from seismic refraction, seismic reflection, gravity, magnetic, and microearthquake measurements

Creator:: Johnson, Stephen Hans
Abstract:: Seismic refraction measurements along two unreversed lines indicate that the earth's crust is 26 km thick in southeastern Alaska and 30 km thick along the Inside Passage of British Columbia. The crust in southeastern Alaska, north of Dixon Entrance, consists of a layer 9 km thick with a seismic velocity...
Resource Type:: Dissertation
Full Text:: This research was initiated and guided by Dr. Richard W. Couch. I am grateful for his advice and

Aeromagnetic measurements, magnetic source depths, and the Curie point isotherm in the Vale-Owyhee, Oregon geothermal area

Creator:: Boler, Frances M.
Resource Type:: Masters Thesis
Full Text:: approved: Dr. Richard W. An aeromagnetic survey, conducted in December, 1976, and April, 1977 by Oregon

Geothermal and structural implications of magnetic anomalies observed over the southern Oregon Cascade Mountains and adjoining Basin and Range province

Creator:: McLain, William Henry
Resource Type:: Masters Thesis
Full Text:: AND RANGE PROVINCE Abstract approved: Richard W. Couch To assist in the assessment of the

ScholarsArchive@OSU

Long wavelength gravity anomalies and implications concerning a descending lithospheric slab in the Pacific Northwest

Crustal structure and thermal gradients of the northern Gulf of California determined using spectral analysis of magnetic anomalies

Structure of the Panama Basin from marine gravity data

Crustal structure of the northwestern continental margin of the Indian subcontinent from gravity and magnetic data

Gravity and structure of the Pacific continental margin of Central Mexico

Crustal structure and faulting of the Gulf of California from geophysical modeling and deconvolution of magnetic profiles

Structures of the continental margin of Central America from northern Nicaragua to northern Panama

Crustal structures and tectonism in southeastern Alaska and western British Columbia from seismic refraction, seismic reflection, gravity, magnetic, and microearthquake measurements

Aeromagnetic measurements, magnetic source depths, and the Curie point isotherm in the Vale-Owyhee, Oregon geothermal area

Geothermal and structural implications of magnetic anomalies observed over the southern Oregon Cascade Mountains and adjoining Basin and Range province

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