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Gravity and structures of the crust and subcrust in the northeast Pacific Ocean west of Washington and British Columbia

Creator:: Couch, Richard W.
Resource Type:: Dissertation
Full Text:: STRUCTURES OF THE CRUST AND SUB- CRUST IN THE NORTHEAST PACIFIC OCEAN WEST OF WASHINGTON AN Abstract

Paleomagnetic inclination shallowing in deep-sea sediments

Creator:: Arason, Pórdur
Abstract:: In this thesis anomalous downcore shallowing of paleomagnetic inclinations is interpreted to be caused by sediment compaction. Thus, compaction-induced inclination shallowing may influence tectonic reconstructions that are based on inclinations from deep-sea sediment cores. Progressive downcore shallowing of the remanent inclination was observed in a 120-m section of Plio- Pleistocene...
Resource Type:: Dissertation
Full Text:: From the Pacific Ocean 2.1 Introduction 9 2.2 Data From Pacific Ocean Sediments 12 2.3 Data Analysis 21

Microearthquake studies of the Blanco fracture zone and Gorda Ridge using Sonobuoy arrays

Creator:: Jones, Paul Roy III
Abstract:: University deployed two arrays of three sonobuoys over the Blanco fracture zone and two arrays of four sonobuoys over the Gorda ridge to detect and locate microearthquakes. Microearthquake activity predicted by plate tectonic theory for the Blanco fracture zone and Gorda ridge was observed by these arrays to originate from...
Resource Type:: Masters Thesis
Full Text:: (1967) have shown that in the north Pacific both smaller seismic events are detectable and systematic

A geophysical analysis of the Orozco fracture zone and the tectonic evolution of the northern Cocos plate

Creator:: Lynn, Walter S.
Abstract:: In April of 1974, Oregon State University conducted a geophysical survey of the Orozco fracture zone, a Left-lateral transform fault which offsets the East Pacific Rise off the coast of Mexico near 15°N, 105°W. Magnetic, gravity, bathymetric, and seismic reflection data were collected during a four day period. This survey...
Resource Type:: Masters Thesis
Full Text:: Pacific Rise axis. The Rivera fracture zone is still in the process of adjusting to Pacific-North

Gravity measurements and their structural implications for the continental margin of southern Peru

Creator:: Whitsett, Robert Manning
Abstract:: A free-air gravity anomaly map of the continental margin of Peru between 12° and 18° S. Lat. shows a -110 to -220 mgl anomaly associated with the Peru-Chile Trench, a -60 mgl anomaly over the Pisco Basin on the continental shelf, and -120 mgl anomaly over the Mollendo (or Arequipa)...
Resource Type:: Dissertation
Full Text:: from the Pacific Ocean to the Amazon Basin using the land and sea refraction data described above for

Shallow crustal structure of the caldera of Axial Seamount, Juan de Fuca ridge

Creator:: van Heeswijk, Marijke
Abstract:: An airgun refraction line along the length of the caldera of Axial Seamount as recorded by three Ocean Bottom Seismometers has been analyzed using the tau-zeta inversion technique (Dorman and Jacobson, 1981). Five resulting velocity profiles show that the seismic velocities of the upper 1.4 km of the crust are...
Resource Type:: Masters Thesis
Full Text:: the Pacific and North America plates, called the Farallon plate. The Farallon plate subducted below

Three-dimensional gravity analysis of the Pacific-Antarctic east Pacific rise at 36.5°S, 49.8°S and 54.2°S

Creator:: Enriquez, Kelly D.
Abstract:: Three-dimensional gravity analysis is the process of removing the predictable components from the free-air gravity anomalies and has proven to be useful for interpreting the subsurface structures and active processes at mid-ocean ridges. The three-dimensional effects of the seafloor and Moho topography, assuming a constant crustal thickness and constant crust...
Resource Type:: Masters Thesis
Full Text:: the Pacific-Antarctic East Pacific Rise at 36.5°S. 49.8°S and 54.2°S Abstract approved: Three

Precise measurements of coda buildup and decay rates of western Pacific P, P₀ and S₀ phases and their relevance to lithospheric scattering

Creator:: Brandsdottir, Bryndis
Resource Type:: Masters Thesis
Full Text:: Coda Buildup and Decay Rates of Western Pacific P. P0.ani0 Phases and their Relevance to Lithospheric

Microseismicity on the Gorda Ridge

Creator:: Solano-Borrego, Ariel E.
Abstract:: The seismicity at the northern section of the Gorda Ridge has been studied with Ocean Bottom Seismographs. Nearly one hundred earthquakes were located with RMS travel time residuals less than 0.5 seconds. Most of these events lie within or near the array and they are probably associated with the dynamics...
Resource Type:: Masters Thesis
Full Text:: response to a general north-south compression of the Gorda plate. Mid-Ocean Ridge Seismicity Studies

Crustal structure and seismicity of the Gorda Ridge

Creator:: Solano-Borrego, Ariel E.
Abstract:: We have determined the seismic crustal structure of the northern part of the Gorda Ridge using signals generated by explosive charges and recorded on Ocean Bottom Seismometers. The shot pattern forms two parallel lines, one on the east flank and the other along the median valley. Inversion of the travel...
Resource Type:: Dissertation
Full Text:: recorded on Ocean Bottom Seismometers. The shot pattern forms two parallel lines, one on the east flank

ScholarsArchive@OSU

Gravity and structures of the crust and subcrust in the northeast Pacific Ocean west of Washington and British Columbia

Paleomagnetic inclination shallowing in deep-sea sediments

Microearthquake studies of the Blanco fracture zone and Gorda Ridge using Sonobuoy arrays

A geophysical analysis of the Orozco fracture zone and the tectonic evolution of the northern Cocos plate

Gravity measurements and their structural implications for the continental margin of southern Peru

Shallow crustal structure of the caldera of Axial Seamount, Juan de Fuca ridge

Three-dimensional gravity analysis of the Pacific-Antarctic east Pacific rise at 36.5°S, 49.8°S and 54.2°S

Precise measurements of coda buildup and decay rates of western Pacific P, P₀ and S₀ phases and their relevance to lithospheric scattering

Microseismicity on the Gorda Ridge

Crustal structure and seismicity of the Gorda Ridge

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