Browsing Rice University Graduate Electronic Theses and Dissertations by Subject "Geophysics"
Now showing items 120 of 179

A diagenetic study of the lower coralline limestone (oligocene), the Maltese Islands
(1980)The Maltese Islands are located on a broad platform extending from northern Africa to Sicily which divides the Mediterranean Sea into an eastern and western basin. Strata exposed on the islands range from Upper Oligocene ... 
A FINITEELEMENT MODEL OF LUNAR THERMAL EVOLUTION
(1980)An attempt is made to model the thermal history of a selfgravitating Moon. Since the Rayleigh number at the end of the accretionary stage is supercritical, thermal convection in the Moon is likely to have occurred as early ... 
A Method to Compute Three Dimensional Magnetospheric Equilibria with Dipole Tilt and its Application in Estimating Magnetic Flux Tube Volume
(2011)In this thesis we describe a new version of a magnetofriction model, which was developed for computing the magnetospheric equilibrium that includes an arbitrary Earth's dipole tilt and interplanetary magnetic field. We ... 
A model of bounceaveraged relativistic protons with emphasis on the March 1991 magnetospheric compression
(1997)We have derived relativistically correct gyro and bounceaveraged Hamiltonian equations of motion to describe the motions of nonisotropic proton distributions in the Earth's inner and middle magnetosphere. We have focused ... 
A new approach to slant stack processing: An Xwindow (OSF/motif) project
(1992)A new definition for slant stack and inversion has been formulated. The different p ranges with different frequencies in the forward slant stack provide accurate reconstruction of the original data. The computing time is ... 
A New Approach to the HighResolution Linear Radon Transform based on Compressive Sensing Theory: Application on Teleseismic Wavefields
(20130419)The development of new tools for highresolution seismic imaging has been for many years one of the key challenges faced by earthquake and exploration seismologists. In order to make data amenable to imaging analysis, ... 
A new approach to traveltime selection for Kirchoff migration
(2001)Prestack migration of seismic data is a dominant tool for imaging hydrocarbon bearing structures in the Earth. The standard prestack depth migration is a Kirchhoff approach using singlevalued traveltimes computed from ... 
A Paleomagnetic Study of the Permian Basalts at Las Delicias, Coahuila, Mexico
(1970)The Permian lavas and pyroclastics near Las Delicias, Mexico were measured for their natural remanent magnetism in the attempt to obtain a thermoremanent magnetic pole determination for the Permian period from North America. ... 
A sequence stratigraphic analysis of the late JurassicTuronian in the context of the evolution of the West Siberian basin
(2001)During the Triassic, Siberia was a basin approximately 1800 kilometers wide filled by red beds and the widespread Tunguska basalts. Rifting occurred in the northern part of the basin. The western part of the Siberian basin ... 
A structural study of the Hukou and Hsinchu areas Northwestern Taiwan
(1985)Northwestern Taiwan, which includes the Kuanyin, Hukou and Hsinchu areas, was initially a part of the continental shelf of the mainland China coast. The Neogene sediments were deposited m gently eastdipping basement in a ... 
A study of seismic wave propagation in heterogeneous crust
(1999)Three different aspects of estimating properties from seismic data are treated in this thesis: (1) Deterministic processing of a high resolution shallow seismic data set with good geologic control, (2) traveltime estimation ... 
A study of Uranian magnetospheric convection
(1990)In order to understand and explain the lowenergy plasma structures observed by the PLS experiment on Voyager 2 in the Uranian inner magnetosphere, an analytic and selfconsistent model of a timedependent solarwind driven ... 
A study of viscous effects in seismic modeling, imaging, and inversion: Methodology, computational aspects, and sensitivity
(1996)Real Earth media are anelastic, which affects both the kinematics and dynamics of propagating waves: Waves are attenuated and dispersed. If anelastic effects are neglected, inversion and migration can yield erroneous ... 
A unified approach to complex seismic imaging problems
(1991)Two current challenges in seismic imaging are to obtain more detailed images of complex structures from reflection data and to constrain the regional structure of the Earth using wideangle data. These are complex problems ... 
An alternative approach to differential semblance velocity analysis via normal moveout correction
(2010)This thesis develops a new computation of the objective function and gradient for normal moveoutbased differential semblance (DS). The DS principle underlies a class of algorithms for seismic velocity analysis. The simplest ... 
Analysis of the application of collision cross sections and ion neutral reaction rates in the upper atmosphere modeling
(2000)Review and analysis of atomic collision data (such as collision cross sections and ionneutral reaction rates) used in the upper atmospheric modeling for Earth and other planets are presented. This work gives the first ... 
Analytical and numerical modeling of the electromagnetic structure of geospace
(1995)Geospace is a vast complex system. A portable quantitative model of the geospace electromagnetic structure is the foundation of many researches in the area of space plasma physics. Work described in this dissertation uses ... 
Application of seismic tools and techniques to groundpenetrating radar (GPR) studies
(1998)Seismic techniques and tools have not routinely been transferred to groundpenetrating radar (GPR) studies due to computational, financial, and logistical limitations. A simple processing package was developed to aid in ... 
Approximate inverse scattering using pseudodifferential scaling
(2009)This thesis proposes a computationally efficient method for approximating the inverse of the normal operator arising in the linearized inverse problem for reflection seismology. The inversion of the normal operator using ...