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Showing 1 to 8 of 8 for “"velocity tomography"”.
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Four-Dimensional Passive Velocity Tomography of a Longwall Panel
Velocity tomography is a noninvasive technology that can be used to determine rock mass response to ore removal. Velocity tomography is accomplished by propagating seismic waves through a rock mass to measure velocity distribution of the rock mass. Tomograms are created by mapping this velocity …
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Time-lapse Passive Seismic Velocity Tomography of Longwall Coal Mines: A Comparison of Methods
Time-lapse passive seismic velocity tomography was conducted utilizing data from three underground longwall coal mines to produce a better understanding of the processes that lead to ground failure in mines, especially large, violent failures, such as bumps. Two of the datasets, US Western I and US …
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Quantitative Comparison of Seismic Velocity Tomography With Seismic Activity Around a Deep Coal Longwall Panel
… with high in-situ stress levels. By using tomography programs a three-dimensional velocity model can be constructed. When seismic activity is present the event arrival times at each geophone, the locations of each geophone, and the three dimensional velocity model are used in conjunction …
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Stress Redistribution in Berea Sandstone Samples Using Acoustic Emission Tomography in the Laboratory
Velocity tomography is a noninvasive technique that can image the interior of a rock structure. To apply tomography to rock specimens, a propagation wave, which acts as a probe, is used. The propagation wave propagates from a source until it reaches a sensor on the surface of the rock specimen. …
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An Assessment of Hypocenter Errors Associated with the Seismic Monitoring of Induced Hydro-fracturing in Hydrocarbon Reservoirs
… data sets to investigate how the accuracy of the velocity model, starting hypocenter location, recording geometry, and arrival-time picking error affect final hypocenter locations. Hypocenter locations improved using a velocity model that closely matched the observed sonic log rather than a …
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Teleseismic P Wave Attenuation in the Upper Mantle Beneath the United States
… [Dalton et al., 2008] and upper mantle P wave velocity tomography [Schmandt and Lin, 2014]. The magnitude of t* variations inverted from P wave spectra near 1 Hz is ~10x greater than predicted by long-period surface wave studies of upper mantle attenuation. This is caused by the influence of …
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Atmospheric water vapour tomography for DInSAR application and effect of volcanic plume on the microwaves
… a method to obtain a 3D electromagnetic waves velocity tomography, starting from the GPS output data analysis. Thanks to the agreement between the University of Catania and the INGV-OE, the GPS data used in this work come from Etnanet framework. The GPS processing has been carried out by using …
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Seismic structure of the Arava Fault, Dead Sea Transform
Ein transversales Störungssystem im Nahen Osten, die Dead Sea Transform (DST), trennt die Arabische Platte von der Sinai-Mikroplatte und erstreckt sich von Süden nach Norden vom Extensionsgebiet im Roten Meer über das Tote Meer bis zur Taurus-Zagros Kollisionszone. Die sinistrale DST bildete sich …