Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 33 for “"Magnetic anomalies"”.
-
Magnetic anomalies over a portion of the Granite Mountains, central Wyoming
… that fill intervening basinal areas.</p> <p>Aeromagnetic data shows a nearly uniform magnetic field that is interrupted by a few isolated, but strong, anomalies, which are caused by magnetic contrasts within the basement complex. Studies of the magnetic characteristics of the exposed Precambrian …
-
Investigation of the upper mantle as a source for contribution to magnetic anomalies
… the lithospheric mantle contains significant magnetic regions that contribute to the magnetism observed/measured, either at or close to the Earth’s surface, or from satellite data. Chapter 1 “Eight good reasons why the mantle could be magnetic” (2014) published in Tectonophysics by Ferré, …
-
Magnetic model studies of the New York--Alabama Lineament and other magnetic anomalies in West Virginia
This study was undertaken to model magnetic anomalies observed in aeromagnetic data across the central Appalachian foreland of West Virginia. Total field intensity models of the New York Alabama magnetic lineament indicate that the maximum depth to the center of the source object could be …
-
Detailed studies of the structure, tectonics, near bottom magnetic anomalies and microearthquake seismicity of the Mid-Atlantic Ridge near 37N̊
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
-
Detailed studies of the structure, tectonics, near bottom magnetic anomalies and microearthquake seismicity of the Mid-Atlantic Ridge near 37°N
… in crustal magnetization only 2-3 km wide. Magnetic studies indicate that over 90% of the extrusive volcanism occurs within the rift inner floor, a zone 1 to 12 km wide, while volcanism is extremely rare in the rift mountains. Volcanoes created in the inner floor are transported out on, …
-
MAGANOM : a computer program for the modeling and interpretation of marine magnetic anomalies with an example from the Cayman Trough, northwest Caribbean Sea
… interactive computer program for residual magnetic anomaly data processing and modeling. It is designed to model the magnetic anomalies above 2-dimensional magnetic bodies. The principal use of the program is to model sea floor spreading anomalies. It can also calculate and display the …
-
Aeromagnetics of selected continental areas flanking the Indian Ocean : with implications for geological correlation and reassembly of Central Gondwana
… history is well understood using marine magnetic anomalies, coastline geometry, surface geology and limited geophysics. Uncertainty still prevails in reassembly of central Gondwana fragments flanking the Indian Ocean. This thesis aims at utilising geophysical constraints to corroborate an …
-
A geomagnetic survey of Pembina, Grand Forks, and eastern Walsh counties, North Dakota
… August, 1977, to March, 1978, total field geomagnetic readings were taken at 948 sites in the following counties in North Dakota: Pembina County, Grand Forks County, and Walsh County east of 98°W. longitude. The field data was contoured by computer using the SYMAP commercial computer program. …
-
Characterization and modeling of materials responsible for planetary crustal magnetism
… planets in our solar system with present-day magnetic dipole fields generated by internal dynamo systems. In contrast, Mars and the Moon show evidence of past dipole fields in the form of crustal magnetic anomalies; to hold measurable magnetizations, crustal materials must have been exposed to …
-
Tertiary and carboniferous magmatism around Lundy Island and the outer Bristol Channel - a geophysical and geochemical perspective
… volcanic complexes with positive gravity and magnetic anomalies, some centres associated with both large volumes of continental flood basalts and regional dyke swarms. The Lundy Island is the southern most expression of Tertiary volcanism and consists of granite intruded by around 200 dykes …
-
Effects of metamorphism and structure on aeromagnetic anomalies over the Carolina slate belt near Roxboro, North Carolina
Interpretation of aeromagnetic anomalies to find the subsurface extent and attitudes of multiply deformed stratigraphic units near Roxboro, North Carolina is complicated by effects of regional metamorphism on rock magnetism. Anomaly amplitudes diminish markedly to the WNW near the onset of …
-
The origin and tectonic history of the Southwest Philippine Sea
… thesis is a collection and analysis of seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin as a marginal basin. Our results suggest that this basin was formed in an Eocene …
-
Tectonic evolution and midplate volcanism in the South Pacific
… rate is locally constrained with observations of magnetic anomalies and spreading fabric orientation. At the southeastern end of the Cook-Austral Island chain, multiple episodes of volcanism have left a diverse population of seamounts. Volume estimates from geophysical data and modeling show that …
-
Late Cenozoic basalts from the Basin-Range province, western United States
… flow, seismic velocities, crustal thickness, magnetic anomalies and geologic setting. Alkali-olivine basalts from Japan and eastern Australia are analogous to those from the Basin-Range province both in composition and tectonic environment. It is suggested that these lavas are the products of …
-
Petrography of Precambrian iron formation, Pembina County, North Dakota
… Geological Survey reported difficulties in using magnetic compasses while mapping in the areas of Akra and Hensel, Pembina County, North Dakota. University of North Dakota geologists located anomalies of 67,500 gammas 1.6 lon east of Akra and 71,500 gammas 4 km east of Hensel, the normal magnetic …
-
Two dimensionality in magnetic interpretation
Thesis (M.S.)--Michigan State University. Dept. of Geology, 1970
-
A magnetometer based payload for a PTOL UAV with application in geophysical surveys
… phenomena associated with the Earth is the magnetic field or geomagnetic field. By localising magnetic anomalies within the geomagnetic field one can make predictions or inferences about the localised geophysical makeup and potential ore bodies, hydrocarbon deposits or archaeological …
-
An investigation of ground based and aeromagnetic data over the Cairngorm and other Caledonian granites in the UK
The aeromagnetic map of Great Britain shows a number of granites associated with magnetic anomalies. One of the largest of these granites, the Cairngorm pluton, has a complex overlying aeromagnetic anomaly, yet measurements show that the surface rocks have a magnetic susceptibility too low to …
-
The origin of the ninetyeast ridge and the northward motion of India, based on DSDP paleolatitudes
… thes is is a collection of papers on the paleomagnetics of samples from several Deep Sea Drilling Project (DSDP) sites in the Indian Ocean. These papers present the basic paleomagnetic data, discuss the statistical methods for analyzing such data from DSDP cores, and examine the implications of …
Page 1 of 2