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 20 of 20 for “"Seismic methods"”.
-
A comparison of three seismic methods in the arid environment
Eight locations in the vicinity of Las Vegas, Nevada, were noise tested using a shotgun, high frequency geophones, and an engineering seismograph. The noise spreads were examined for reflection events to determine shotpoint to geophone offset for an optimum window reflection profile. No reflection …
-
Using Radar and Seismic Methods for the Determination of Ice Column Properties and Basal Conditions at Jakobshavn Isbræ and the NEEM Drill Site
… from ice cores. Observations of anisotropic seismic wave propagation and backscatter variation as a function of antenna orientation in GPR measurements have been proposed as methods to detect COF. For this investigation I evaluate the effectiveness of the GPR and seismic methods to detect COF …
-
Ultrasonic velocity measurements of simulated lunar regolith with variable ice content: a laboratory and modeling investigation with implications for geophysical lunar resource exploration
… ice deposit. Geophysical techniques such as seismic methods are routinely used on Earth to extrapolate information from samples over tens of meters to thousands of kilometers and are suitable to do the same for extraterrestrial bodies. This study aims to advance our understanding of how …
-
An Approach to Mapping of Shallow Petroleum Reservoirs Using Integrated Conventional 3D and Shallow P- and SH-Wave Seismic Reflection Methods at Teapot Dome Field in Casper, Wyoming
… (P) and horizontally polarized shear (SH) wave seismic reflection surveys can overcome the limitations of conventional 3D seismic data in resolving small-scale structures in the very shallow subsurface (< 100-200 m (~328-656 ft)). We accomplish this by using small CMP intervals (5 ft and 2.5 ft, …
-
Analysis and Application of Coal Seam Seismic Waves for detection of Abandoned Mines
… mine void detection utilizing coal seam seismic waves, two in-seam reflection surveys and a transmission survey were acquired at an abandoned underground mine near Hurley, Virginia. Numerical modeling of the seam waves was examined as well. The Airy phase was observed in the synthetic and …
-
Seismic studies of 3-D elastic and anelastic structure of crust and upper mantle in Western China
… Indian-Eurasian continental collision. It is seismically very active even in some populous regions. Therefore, it is important to study the crustal and upper mantle structure beneath western China to understand the tectonics of the region and provide constraint for earthquake hazards. There …
-
Automated Vehicle Detection and Classification using Acoustic and Seismic Signals
… describes an investigation into acoustic and seismic methods for achieving such a system specifically for commercial road vehicles. Accurate algorithms have been developed for recognition of moving vehicles using fusion of acoustic and seismic signals. It has been found that seismic signals …
-
Analysis of the repeatability of time-lapse 3D VSP multicomponent surveys, Delhi field
… monitor the CO2 sweep efficiency, time-lapse 3D seismic data have been acquired in this area. Time-lapse studies are increasingly used to evaluate changes in the seismic response induced by the production of hydrocarbons or the injection of water, CO2 or steam into a reservoir. A 4D seismic …
-
Enhancing land seismic data with compressive sensing and processing
Active-source seismic methods can provide a wealth of information about the structural and stratigraphic makeup of the subsurface as well as about physical and reservoir properties of rocks. However, high-resolution imaging subsurface techniques are challenging to apply for land seismic data. …
-
Combining seismic and geotechnical methods to improve the prediction of physical soil properties
Seismic investigation offers subsurface information in a cost and time effective way compared with the geotechnical methods. The seismic data (i.e. bender element data) needs to be correlated with geotechnical data allowing it to be adopted in engineering designs. However, the procedures and …
-
Displacement-Based Seismic Design of Timber Structures
The research is aimed at developing seismic methods for the design and evaluation of the seismic vulnerability of wooden structures, using a displacement-based approach. After a brief introduction on the seismic behaviour of timber structures, the general Direct Displacement-Based Design …
-
Seismic characterization of geothermal reservoirs by application of the common-reflection-surface stack method and attribute analysis
… in the first phase. With the help of active seismic methods high-resolution images of the geothermal reservoir can be delivered. This allows potential transport routes for fluids to be identified as well as regions with high potential of heat extraction to be mapped, which indicates favorable …
-
Seismic attribute analysis and CO2 monitoring within the Mississippian reservoir, Wellington field, Sumner County, Kansas
… the United States but are challenging to image seismically due to their high heterogeneity and thicknesses typically below seismic resolution. In 2016, the Kansas Geological Survey (KGS) conducted a pilot study in the Mississippian chert reservoir at Wellington field, Sumner County, Kansas to …
-
Characterizing microearthquakes and shallow structure with dense array and optical fibers
… help us to constrain source physics and assess seismic hazards. Small events carry information about the stress state in the subsurface. They also help us predict the behavior of larger earthquakes. However, the source properties of small earthquakes (magnitude less than 3) are poorly …
-
Methane Gas Hydrate Morphology and its Effect on the Stiffness and Damping of some Sediments
… energy resource or natural geohazard. Current seismic methods, used to<br/>identify and quantify gas hydrates, have proved to be unreliable in providing accurate information on<br/>the extent of natural gas hydrate deposits, due to the lack of understanding on how gas hydrate affects<br/>the …
-
Seismicity and structure of the eastern Gawler Craton and Lake Eyre region
… region is associated with pronounced intraplate seismic activity and thick sedimentary cover that potentially obscures the elusive boundary between older Proterozoic and younger Phanerozoic eastern Australia. Despite this, the area had limited seismic data coverage due to its remoteness and the …
-
Seismicity and structure of the eastern Gawler Craton and Lake Eyre region
… region is associated with pronounced intraplate seismic activity and thick sedimentary cover that potentially obscures the elusive boundary between older Proterozoic and younger Phanerozoic eastern Australia. Despite this, the area had limited seismic data coverage due to its remoteness and the …
-
Seismic study of the crust and upper mantle structure in eastern Asia using ambient noise correlation and earthquake data
Seismic methods using natural earthquakes are commonly applied to investigate the velocity structures of the crust and upper mantle. Among all these methods, seismic tomography is one of the most powerful tools to image the earth’s structure. Recent theoretical and experimental studies suggest that …