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Inversion of body-wave seismograms for upper mantle structureGiven, Jeffrey Wayne. January 1983 (has links)
Thesis (Ph. D.)--California Institute of Technology, 1983. / Includes bibliographical references.
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Inverse method in seismologyDe Villiers, Jean Schepers 11 1900 (has links)
The problem of fitting a material property of the earth to a certain model by
analysing a returned seismic signal is investigated here. Analysis proceeds with
methods taken from the theory of inverse problems. Seismic wave inversion is tack-
led by minimisation of the objective function with respect to the model parameters.
Absorbing boundary conditions are implemented using an exponentially decaying
ansatz. / Physics / Ph. D. (Physics)
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Development of a 2-degree-of-freedom transverse line source for a seismo-acoustic SONARWang, Shu-Kang. 12 1900 (has links)
This thesis describes the beach field-testing of a 2-degree-of-freedom (2-DOF) transverse line Rayleigh wave source for use in a seismo-acoustic SONAR for buried mine detection. The source is composed of six identical modules, each composed of two radial and two vertical inertial mass shakers, all mounted to a common base plate. The vertical and horizontal excitation of each module is independent. Electrically, the six modules are organized into three independent sets of two. The length of the source is 46 inches (1.17m), the width 6 inches (0.15m) and the weight 126 pounds (562N). Field tests were conducted using a 5-cycle, (smooth-)amplitude-modulated transient excitation signal. Based on past and present experience that the Rayleigh wave speed at the beach test site is approximately 90 m/s, a carrier frequency of 100 Hz was employed, producing a Rayleigh wavelength and surface penetration depth of approximately 1 m (approximately equal to the source aperture length), which is appropriate for the intended application. The source radiation directional characteristics were investigated for various relative amplitudes and phases of vertical and horizontal shaker excitation. A null result was obtained, that is, no unambiguous evidence of directivity was observed in any of the experiments conducted using this source. These included measurements wherein the source modules were removed from the common base plate and emplaced on the sand. The reason for this result is unknown, but it is suspected that a good possibility is that the beach sand medium just below its surface, whereupon the present source and receivers were deployed, is not homogeneous enough to support coherent spatial beamforming. Based upon the past success of a 4-element end-fire line array in producing directional Rayleigh wave radiation (10-15 dB front-to-back rejection), it is suggested that, if such a source can be made mobile, it may well be the best source candidate for a seismo-acoustic SONAR for buried mine detection.
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Three dimensional seismic kinematic inversion with application to reconstruction of the velocity structure of Rabaul volcano / by Chao-ying Bai.Bai, Chao-Ying January 2004 (has links)
"July 2004" / Bibliography: leaves 215-230. / viii, 230 leaves : ill., maps ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, School of Chemistry and Physics, Discipline of Physics, 2004
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Shear-wave anisotrophy across the Cascadia Subduction Zone from a linear seismograph arrayFabritius, R. Axel 02 May 1995 (has links)
Graduation date: 1995 / Best scan available for figures.
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Synthesis of earthquake ground motions for the new madrid seismic zoneDrosos, Vasileios A. 01 December 2003 (has links)
No description available.
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Experimental and theoretical studies in support of implementing the spectral-analysis-of-surface-wave (SASW) method offshore /Rosenblad, Brent Lyndon, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 293-298). Available also in a digital version from Dissertation Abstracts.
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Next generation structural technologies : implementing high force-to-volume energy absorbers : a thesis presented for the degree of Doctor of Philosophy in Mechanical Engineering at the University of Canterbury, Christchurch, New Zealand /Rodgers, Geoffrey W. January 2009 (has links)
Thesis (Ph. D.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (p. 259-263). Also available via the World Wide Web.
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Stochastic inversion of pre-stack seismic data to improve forecasts of reservoir productionVarela Londoño, Omar Javier. January 2003 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.
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Synthesis of earthquake ground motions for the new madrid seismic zoneDrosos, Vasileios A., January 2003 (has links) (PDF)
Thesis (M.S. in C.E.)--School of Civil and Environmental Engineering, Georgia Institute of Technology, 2004. Directed by Glenn J. Rix. / Includes bibliographical references (leaves 94-97).
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