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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Crustal structure and reflections from the Mohorovic̆ić discontinuity in southern California

Shor, George G. Richter, C. F. January 1954 (has links)
Thesis (Ph. D.)--California Institute of Technology, 1954. / Advisor names found in the Acknowledgments pages of the thesis. Title from home page. Viewed 02/18/2010. Includes bibliographical references.
2

Thin-skinned tectonics on continent/ocean transitional crust, Sulaiman Range, Pakistan

Jadoon, Ishtiaq Ahmad Khan 20 May 1991 (has links)
Surface and subsurface data from the Sulaiman thrust belt show that nearly all the 10 km thick sequence of dominantly platform (>7 km) and molasse strata is detached at the deformation front. These strata thicken tectonically to a minimum of 20 km in the hinterland of the Sulaiman fold belt without significant thrust faults at the surface. The balanced structural cross-:section suggests that the tectonic uplift in the Sulaiman fold belt is a result of thin-skinned, passive-roof duplex style of deformation. The duplex sequence of Jurassic and older rocks is separated from the roof sequence by a passive-back thrust in thick Cretaceous shales. The passive-roof sequence remains intact for about 150 km and becomes emergent along a passive-back thrust in the hinterland. The structures are expressed at the surface by fault-related folds in the foreland and out-of-sequence structures (secondary faults and related pop-ups) in the interior. The duplex structure varies from fault-bend folds to anticlinal stacks, and hinterland dipping duplexes. Progressive deformation reveals a series of structural and geometrical features including: (1) broad concentric folding at the fault tip; (2) development of a passive-roof and duplex sequence; (2) forward propagation of the duplex as critical taper is achieved; (4) tear faults and extensional normal faults within the overthrust wedge; and (5) out of sequence (secondary) thrusting. The 349 km long balanced cross-section from the Sulaiman fold belt restores to an original length of 727 km that provides 378 km of shortening in the cover strata of the Indian subcontinent. Minimum estimate of shortening is 328 km. Modelling of the Bouguer gravity profile from the Sulaiman foredeep across the Indian/ Afghan collision zone suggests the depth to the Moho at the Sulaiman deformation front is about 36 km. Depth to Moho increases northward with a gentle gradient of 1.1° (20 m/km) for 280 km to the hinterland where the depth to the Moho is about 42 km. About 150 km north across the Khojak flysch the Moho gradient steepens abruptly to about 7.8° (136 m/km) to attain an average depth of about 57 km in eastern Afghanistan. This suggests that the Sulaiman fold belt is underlain by transitional crust associated with the western passive margin of the Indian subcontinent. / Graduation date: 1992
3

Mapping Moho undulations beneath the Grand Banks of Newfoundland using gravity field data /

Morrissey, B. Janet, January 2001 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2001. / Bibliography: leaves 177-186. Also available online.
4

Tectonic analysis of northwestern South America from integrated satellite, airborne and surface potential field anomalies

Hernandez, Orlando, January 2006 (has links)
Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 162-176).
5

Magma chamber structure and Moho reflections along the East Pacific Rise /

Babcock, Jeffrey Matthew, January 1997 (has links)
Thesis (Ph. D.)--University of California, San Diego, 1997. / Vita. Includes bibliographical references.

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