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 38 for “"Gravity anomalies"”.
-
Tidal gravity anomalies in southeastern North America
Tidal variations of gravity were measured at fourteen sites in southeastern North America for periods of between 40 and 199 days. These measurements were used to obtain tidal gravity anomalies that indicate the geologic effect of the earth on tidal gravity. The tidal gravity anomaly is a vector …
-
Gravity anomalies and computed variations in thickness of the earth's crust in Colorado
Includes bibliographical references.
-
Tectonics of the East Pacific rise : studies of faulting characteristics and magnetic and gravity anomalies
… (3) investigation of seafloor magnetization anomalies to constrain upper crustal structure, and (4) analysis of gravity anomalies to examine possible correlations between observed variations in seafloor manifestations of volcanism and deformation and underlying structure. Thus, each topic …
-
Tectonics of the East Pacific rise : studies of faulting characteristics and magnetic and gravity anomalies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
-
State-of-stress and rheology of Tibet and its vicinity from gravity anomalies and numerical models
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
-
Selected magnetic and gravity anomalies in the eastern Transvaal and their possible relation to the Rustenburg Layered Suite /
Dissertation (MSc)--University of Pretoria, 1988.
-
Predicted and observed free-air gravity anomalies for delamination models of the formation of the Siberian Flood Basalts
… process, calculations of predicted gravity at the surface can be used to test the model. Temperature, composition, and stress output from the delamination model presented in Elkins-Tanton (2007) were used to calculate predicted gravity measurements at the surface. These predictions …
-
The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… given transform fault earthquake. In Chapter 2, gravity anomalies from a global set of oceanic transform fault systems are investigated. Surprisingly, negative residual mantle Bouguer gravity anomalies are found within fastslipping transform fault domains. These gravity observations suggest a …
-
The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… given transform fault earthquake. In Chapter 2, gravity anomalies from a global set of oceanic transform fault systems are investigated. Surprisingly, negative residual mantle Bouguer gravity anomalies are found within fast-slipping transform fault domains. These gravity observations suggest a …
-
A high resolution gravity survey for the detection of Pleistocene aquifers underlying the Fort Berthold Indian Reservation, North Dakota
<p> A high resolution gravity survey was performed over portions of McLean, Mountrail, and Ward Counties in central North Dakota during the fall and winter of 1990-1991. The study was performed to locate and map Pleistocene sand and gravel aquifers. Well data indicate that aquifers beneath the …
-
Geologic framework of gravity anomaly sources in the central Piedmont of Virginia
Bouguer gravity anomalies at 1870 locations on the central Piedmont of Virginia from 37° 37' N to 37° 52' N and 77° 44' W to 78° 23' W display patterns of variation produced by upper crustal density contrasts and thickening of the crust in a WNW direction. No other deep sources are evident. Upper …
-
Interpretation of aeromagnetic, magnetic, and gravity data from the San Francisco Mountains vicinity, southwestern Utah
… by an east-west trending fault zone. The Bouguer gravity anomalies in the San Francisco Mountains district reflect horst and graben structures typical of the Basin and Range Province, and indicate that an approximate density contrast with the surrounding consolidated sedimentary rocks of +.10 …
-
The gravity field over the Bane Dome in Giles County, Virginia
The Bouguer gravity field, deterrmined from 395 measurements in Giles County, Virginia exhibits a broad positive anomaly approximately 12 mgal in amplitude situated over the Bane Dome, and several smaller anomalies of a few milligals amplitude. For the most part they are produced by the …
-
Splines and local approximation of the earth's gravity field
… collocation in representing geoid heights or gravity anomalies. A pseudo-cubic spline geoid for southern Africa is given, interpolating Doppler-derived geoid heights and astro-geodetic deflections of the vertical. Quadrature rules are derived for the thin-plate spline approximation (over a …
-
Gravity profile evaluation of geological cross-sections through the Southern Appalachians in Frederick County, Virginia
… to further constrain these cross sections. gravity measurements were made at 422 sites in Frederick County. Then, gravity anomalies were compared with theoretical gravity profiles calculated from two dimensional models of density distribution based upon the cross sections. Using the cross …
-
Mantle plume-midocean ridge interaction : geophysical observations and mantle dynamics
We analyze bathymetric and gravity anomalies at five plume-ridge systems to constrain crustal and mantle density structure at these prominent oceanic features. Numerical models are then used to explore the physical mechanisms controlling plume-ridge interaction and to place theoretical constraints …
-
Structural framework of the Sunda Shelf and vicinity
… Sea). Water depth, sediment thickness, and the gravity and magnetic fields were continuously measured. Expendable radiosonobuoys were used for seismic refraction measurements. These geophysical data supplemented by earlier studies over the northern Sunda Shelf and geological data from land areas …
-
Dynamic Topography of Madagascar and its Surroundings
… In contrast, observed residual depth anomalies of the oceanic plate vary over wavelengths of $10^{3}$~km with amplitudes of $\pm 1$~km around the African margin. Positive long-wavelength free-air gravity anomalies, sub-plate seismic velocity anomalies, and geochemical observations …
-
Round Lake Gravity Anomaly, Delta County, Michigan
Thesis (M.S.)--Michigan State University. Dept. of Geology, 1974
-
Receiver function studies of crustal structure, composition, and evolution beneath the Afar Depression, Ethiopia
… which is also supported by the observation of gravity data which suggest that the active magmatic areas are characterized by higher gravity anomalies while the thicker crusts have smaller and negative anomalies. Thus, the crust beneath the center of the Tendaho Graben is likely to be …
Page 1 of 2