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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

Circulation patterns in Lake Superior

Lien, San-Lang, January 1973 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1973. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
2

Structure of the crust beneath Lake Superior from forward modeling of large aperture seismic data

Shay, John T. 30 March 1990 (has links)
Both travel times and amplitudes of large offset refracted and reflected arrivals observed during GLIMPCE (Great Lakes International Multidisciplinary Program on Crustal Evolution) along line A in Lake Superior have been modeled using two-dimensional ray tracing techniques. Forward modeling was used to iteratively refine an initial velocity model that was constructed from results of tau-sum analysis of the travel time data at each station combined with information from the coincident common depth point (CDP) reflection profile. When converted to time the resulting model agrees quite well with the CDP reflection profile. A 50-100 ms time advance anomaly associated with the Isle Royal Fault is observed at every station. This anomaly has been modeled as shallow, high velocity blocks located directly beneath the fault. The blocks correlate well with the walls of a steep-sided bathymetric trough and are believed to represent highly indurated upper Keweenawan sediments which may have resulted from hydrothermal alteration. Approximately 2 km of sedimentary rock (2.8-4.6 km/sec) overlie an 8 km thick sequence of volcanics and interflow sediments (5.0-6.5 km/sec) within the rift graben observed on the reflection data. Beneath this sequence is a 6-8 km thick sequence of 6.6-7.0 km/sec material that is interpreted to represent metamorphosed volcanics. The velocity of the material at the base of the rift graben is not well constrained (approximately 7.0 -7.2 km/sec), but probably comprises an additional 10-12 kilometers of meta-volcanic rocks and intrusions that extend to the base of the graben as imaged on the CDP reflection profile. Boundaries between these sequences are indicated by reflections observed at several of the wide-aperture stations. A marked decrease in the apparent velocity and amplitude of the first arrivals is observed on reversed sections at ranges exceeding 100 km. This decrease in apparent velocity has been modeled as lower velocity continental crustal rocks (approximately 6.5 km/sec) at a depth of about 15-20 km adjacent to the 7.0 km/sec material in the graben. Calculation of the gravity response of the seismic model demonstrates that the gravity high centered over the rift can be entirely attributed to high density rocks occupying the central half-graben imaged on the CDP profile. Wide angle reflections from about 15-30 km depth beneath the flanks of the graben indicate the presence of velocity discontinuities that may represent rift related detachment surfaces and/or pre-rift structures. Modeling of wide angle reflections indicate a high degree of structural relief preserved within the lower crust. The high velocities modeled for this region, coupled with information from the CDP profile, suggest that the lower crust represents Archean crust that has been either heavily intruded or underplated by mafic magma. The style and volume of volcanic emplacement is similar to that of Phanerozoic rifted continental margins and flood basalt provinces. By analogy, the volcanism within the midcontinent rift appears to have resulted from decompression melting during lithospheric extension above a broad, asthenospheric thermal anomaly recently referred to in the literature as the "Keweenawan hot spot". / Graduation date: 1991
3

The impact of family settlement patterns on the politics of Lake Superior communities, 1890-1920

Blee, Kathleen Marie, January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1982. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 364-394).
4

Changing images of the Cutover a historical geography of resource utilization in the Lake Superior region, 1840-1930 /

Mahaffey, Charles G. January 1978 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 437-445).
5

Shallow seismic refraction studies, Western Lake Superior

Anzoleaga, Rodolfo, January 1969 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
6

Hydrology of the Great Lakes; a symposium. Typical quantitative analysis as applied to lake Superior.

Pettis, Charles Robert, Hickman, Harold Clarence. January 1900 (has links)
Thesis (Ph. D.)--University of Michigan, 1938. / At head of title: American society of civil engineers ... Papers. "Reprinted from Proceedings, April, 1939." eContent provider-neutral record in process. Description based on print version record.
7

Infrared temperature patterns and inferred circulation of Lake Superior

Bratnick, Michael, January 1965 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 16-17.
8

Wind driven coastal upwelling in Lake Superior

Niebauer, H. J. January 1976 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1976. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [259]-264).
9

On Superior's southern shore land and identity in selected works of Louise Erdrich and Jim Harrison /

Bladow, Kyle A., January 2009 (has links)
Thesis (M.A.)--Northern Michigan University, 2009. / Bibliography: leaves 72-78.

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