Searched for: mods_note_programme_s%3A%22Applied%255C%2BGeophysics%22
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Alfaraj, Hassan (author)
When reflection images are studied, often only the zero-offset reflectivity is considered, however, taking into account the angle-dependent reflectivity can add additional information about the Earth's subsurface. This additional information can be used to extract the properties of the subsurface using the amplitude variation with offset (AVO)...
master thesis 2020
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Buist, Jan Willem (author)
The hazards of unexploded ordnance threaten the increasing marine construction activities nowadays, which increases the importance of unexploded ordnance detection. Research has shown that transient electromagnetic methods can successfully be used to detect unexploded ordnance on land. New equipment is being developed to make marine unexploded...
master thesis 2020
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Güdük, Nilgün (author)
Considering the inherent uncertainty of structural geological models, the non-uniqueness of geophysical inverse problems, and the growing availability of data, there is a need for methods that combine different types of data and allow for updating knowledge in a consistent way. By making use of the development of efficient, gradient-based MCMC...
master thesis 2020
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Buisman, Menno (author)
In this research, a new measuring method to detect shear parameters in fluid mud is proposed, namely using shear waves, or S-waves opposed to the conventional pressure waves, or P-waves. Currently, detecting fluid mud is done by the use of P-waves. This paper shows that conventional P-waves velocity measurements are unsuitable for linking...
master thesis 2019
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den Ouden, Olivier (author)
All over the world a so called oceanic 'hum' can be recorded, dominating the ambient noise field. The hum is generated by nonlinear interaction of ocean surface waves, radiating acoustic signals in the atmosphere and water (named microbaroms), and coupling to the solid earth as microseisms. The hum can be generated by local near-coastal sources...
master thesis 2018
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Levy, Shiran (author)
Data assimilaiton, a procedure in which observed data is combined with prior knowledge, is widely used in geophysical systems and especially popular in atmospheric and oceanic models. In this study a Monte Carlo based data assimilation method referred as a bootstrap Particle Filter (PF) and a time lag sampling technique are combined together to...
master thesis 2018
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van IJsseldijk, Johno (author)
Global phases are seismic waves that travel through the earth's core before emerging at the surface. Traditionally, global phases are used to obtain subsurface information up to 1 Hz. A recent study, however, found that signal present in the coda of strong, distant earthquakes contains higher frequencies. Quantitative analysis of the coda of...
master thesis 2018
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Morandini, Nicolas (author)
This thesis demonstrates, that bathymetric data improves data imaging results of full wavefield migration using different acquisition designs. The algorithm gets more stable by constraining the inversion with the sea bottom information, especially in case of large source and receiver spacings, without making compromises on image quality. Not...
master thesis 2018
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Giesgen, Tobias (author)
The automatic interpretation of well logs has been the focus of research, especially in oil and gas industry, for more than 50 years and, aside from that, benefits from the fast developments of machine learning algorithms during the recent decades. Moreover, Bayesian inference is increasingly utilized to model geological data, enabling the...
master thesis 2018
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Wang, Weijun (author)
The finite-element method can easily handle complicated geometries because of the application of unstructured meshes. Unlike the Cartesian grid used in the finite-difference method, the unstructured mesh can follow the sharp interfaces that separate two layers of different properties. Therefore, the finite-element method can provide more...
master thesis 2017
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van den Broek, Floris (author)
In this work, a novel subspace-based algorithm is presented for automated random noise reduction in online recorded music. Musical signal enhancement is a separate issue from the well-studied speech enhancement problem due to the particularly wide range of signal characteristics encountered, and thus requires a very general approach. Because...
master thesis 2017
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Woofenden, George (author)
Current Port of Rotterdam procedure is to define the nautical depth based on the density of a fluid-mud layer, that settles at the bottom of the port. Rheological parameters could be an improved indicator for nautical depth and decrease the frequency and cost of dredging. I investigate the use of reflected seismic waves to derive in situ...
master thesis 2017
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Koene, E.F.M. (author)
Marine seismic acquisition tows submerged streamers to record pressure waves from the subsurface. The recording, however, contains both the desired upgoing wavefield and its (immediate) reflection off the sea-surface, causing a downgoing wavefield known as the seismic ghost. Interference between the up- and downgoing waves causes periodic low...
master thesis 2016
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Ooms, M.C. (author)
The Collisional Orogeny in the Scandinavian Caledonides (COSC) drilling project, supported by the International Continental Drilling Program (ICDP) and Swedish Research Council, was designed to study mountain building processes and the geologic structure and composition of the Caledonian orogeny in central Sweden. The 2.5 km deep scientific COSC...
master thesis 2016
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van der Waal, R. (author)
The main challenge in frontier and near-field exploration is the limited availability of data to interpret the subsurface. In the absence (or prior to drilling) of an appraisal well, possibly only seismic data and prior geology knowledge are at hand. In such data-poor environments, techniques are required that are able to quickly test large...
master thesis 2016
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Benthem, M. (author)
A wide range of wildlife has their habitat around and within levees or other types of embankment structures. In the Netherlands the burrowing of the muskrat causes internal and external erosion, altering the geometry of the earthen structure. As often century-old embankments protect the densely populated land against the water, the burrowing can...
master thesis 2015
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Roepnarain, R. (author)
The Tambaredjo field is the largest oil field in Suriname. Since 1982 the state oil company, Staatsolie Maatschappij Suriname N.V., has been extracting oil from the Palaeocene reservoir sands. More recently there has been a growing interest in the Cretaceous interval below the reservoir sands. However, not much data is available from this...
master thesis 2013
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Frank, J.G. (author)
Green's function retrieval by seismic interferometry (SI) exists in a variety of forms. Many of the applications of SI allow the creation of new seismic traces by crosscorrelating a wavefield recorded at two separate locations. The sum of this operation over multiple sources results in the creation of a new signal such that one of the recording...
master thesis 2013
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Wall, J.P. (author)
Seismic interferometry is a technique by which the Green’s function (or impulse response) between two receivers can be acquired from the crosscorrelations of wavefield responses at these receivers. Recent developments of this method has led researchers to exploit active as well as passive seismic wavefields to retrieve surface wave Green’s...
master thesis 2011
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Zhang, M. (author)
The connectivity between SAGD pair-wells is the key for success of SAGD processes. The bituminous sands of Corner field situate in middle McMurray, where tidal influenced meandering fluvial point bar dominate the deposits. Thus, to characterize the internal structure of point bar deposit is essential to optimize SAGD production in Corner field....
master thesis 2011
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