Index Catalog // ScholarsArchive@OSU

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:: . Geographic and structural province map of Nicaragua and Costa Rica (land geology after McBirney and Williams

Creator:: Woodcock, Stephen Frederick
Abstract:: A free-air gravity anomaly map of the area between 10°-17°N and 90°-101°W shows distinctive positive and negative anomalies which parallel the Tehuatepec Ridge. The positive anomaly approximately overlies the topographic expression of the ridge. On the wide continental shelf southeast of the Gulf of Tehuantepec a positive gravity anomaly with...
Resource Type:: Masters Thesis
Full Text:: range, Surface geology indicates the exposed rocks are primarily Quaternary continental sediments (King

Creator:: Sattel, Daniel
Abstract:: Seismic refraction data collected in 1985 by the USGS were used in this study to derive the P and S velocity structure of the crust beneath the Gulf of Maine. The data quality differs among instruments and is affected by surficial lateral heterogeneities, a ringy source signature and reverberations. Velocity...
Resource Type:: Masters Thesis
Full Text:: velocities parallel to the structural grain of the Appalachians of 6.1-6.4 km/s and velocities transverse to

Creator:: Chevallier, Johanna
Abstract:: A 3D seismic volume was acquired summer 2000 over the southern end of Hydrate Ridge (FIR), an anomalously shallow ridge 100 km offshore Newport, Oregon. The survey followed a succession of scientific expeditions aimed at studying the gas hydrates present in the shallow subsurface that gave the name to the...
Resource Type:: Masters Thesis
Full Text:: ) 4.3.8 UnitS.IA(0.2mytopresent) 67 5 BIOSTRATIGRAPHY 70 6 STRUCTURAL GEOLOGY 74 6.1 Regional

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:: CONTENTS INTRODUCTION. 1 GEOLOGY AND TECTONICS. 7 PREVIOUS GEOPHYSICAL WORK

Creator:: Scheidhauer, Maren
Abstract:: The Queen Charlotte Fault system is a segment of the North America - Pacific plate boundary. From 45 Ma - 5 Ma, plate motion has been primarily translational. Since 5 Ma, transpression has been the dominant mode of interaction. The plate boundary west of the Queen Charlotte Islands is characterized...
Resource Type:: Masters Thesis
Full Text:: ACCRETE experiment in 1994. Structural interpretation of the five new profiles reveals the presence of

Creator:: Fleming, Sean W.
Abstract:: Magnetic and gravity modelling was completed along two E-W transects offshore central Oregon. These models indicate that the backstop-forming western edge of the Siletz terrane has a seaward dip of approximately 40° to 49° at 44°48'N, shallowing to ~28° at 44°1 1 'N. This is a well-determined result, given available...
Resource Type:: Masters Thesis
Full Text:: least in part the product of structural uplift due to underthrusting of young sediments at the bottom

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:: interpreted as the top of the structural basement. Deeper estimates are obtained for the western part of the

ScholarsArchive@OSU