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 14 of 14 for “"source depth"”.
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SOFAR signal shaping : influence of topography and relative source depth
… signals by topographic interference and the depth of the source relative to the axis of the sound channel is investigated. Eight shot signals from five different sites near Cape Town were received at three widely spaced hydrophones at Ascension over a number of 4.4 Megametre lines. These …
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Assessing the Crustal Source Depth and Cause of Magnetization North of Caloris Planitia, Mercury
… aim to test this hypothesis by investigating the depth of the magnetic sources within a specific region in Mercury's northern hemisphere. The chosen region spans latitudes 48° N to 70° N, and longitudes 115° E to 225° E. This region is north of Caloris Planitia, the largest impact crater on …
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Depth discrimination of an acoustic source based on modal energy distribution
The new method of acoustic source depth discrimination in a shallow water environment is investigated. The investigation is concentrated mainly in 500Hz and 1kHz sources in the range-independent and range-dependent environments. Efficiency and robustness of the method is studied and suggestions for …
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Interpreting Southern California Arc Geochemistry by Multivariate and Spatial Methods
… be related to extent of differentiation, magma source depth, and possibly solubility, respectively. The first principal component (PC1) accounting for 56.7% of the explained variance, arranges the elements in order of incompatibility. The main associations of PC2 (17.3% of </p> <p>explained …
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In-situ gamma-ray mapping of environmental radioactivity at Ithemba Labs and associated risk assessment
… external gamma irradiation) due to anthropogenic sources were calculated for two plane source depth locations, namely, 1 and 10 cm. The absorbed and effective dose results that were obtained at 1 cm plane source depth have the ranges 0.2 - 152.7 nGy.h"1 and 0 - 187.3 ^Sv.y"1. The absorbed and …
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The response of a point source in a liquid layer overlying a liquid half space
The response to a harmonic point source in a liquid layer overlying a liquid half space is computed as a function of frequency. Included are the contributions form all normal modes that occur, and the branch-line integral representing the refraction arrival. The value of the refraction arrival is …
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Depth discrimination of an acoustic source based on modal energy distribution - performance analysis/
A recently proposed method [Apelfeld, Y., Depth Discrimination of an Acoustic Source Based on Modal Energy Distribution. MIT, 2007] for rough, but fast and robust depth classification of acoustic sources was investigated in realistic towing scenarios. The method uses modal energy distribution as a …
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Stochastic Dynamically Orthogonal Modeling and Bayesian Learning for Underwater Acoustic Propagation
… and large dimensions. There are thus several sources of uncertainty in acoustic predictions. They include the ocean current, temperature, salinity, pressure, density, and sound speed fields, the bottom topography and seabed fields, the sources and receivers properties, and finally the model …
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INSIGHTS INTO ERUPTION DYNAMICS AND SHALLOW PLUMBING SYSTEM OF MT. ETNA BY INFRASOUND AND SEISMIC SIGNALS
… provide information on explosive phenomena and source mechanism. A more comprehensive knowledge of the source mechanism, as well as of the source depth into the conduit, can be achieved by exploring seismo-acoustic sources, exciting mechanical waves both in the volcano edifice and in the …
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Modeling ocean transport and its biogeochemical impacts at global, regional, and sub-meso scales
… Chapter 3 to identify the dynamics that impact source waters of steady-state upwelling at a regional scale, and we propose a scaling relation in which wind stress and stratification sets the upwelling source depth. Looking more closely at an upwelling front in a high-resolution …
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Patients' self-concept, desire for information and uncertainty reduction
… The patient's level of previous knowledge, its source, depth and credibility was also suggested for future research. Another area suggested for future research would be the correlation between uncertainties and anxieties.</p>
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Microseismic guided wave eigenfunction theory with application to event depth classification in the Eagle Ford shale
… and a novel application for microseismic event depth constraint to an unconventional reservoir is developed. Eigenfunctions, historically used in the analysis of Rayleigh and Love surface waves, allow rapid calculation of response functions that are linearly-correlated with guided wave …
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Inversion of seismic source parameters for weak mining-induced and natural earthquakes
… inversion scheme to derive point and finite source parameters for weak earthquakes, here intended with the unusual meaning of earthquakes with magnitudes at the limit or below the bottom magnitude threshold of standard source inversion routines. The adopted inversion approaches entirely rely …
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Earthquake-induced landsliding
… characteristics such as seismic moment and source depth. A key issue is the accurate conversion of landslide maps into volume estimates. Therefore I also estimated how amalgamation - when mapping errors lead to the bundling of multiple landslide into a single polygon - affects volume …