Papers by Emmanouil Parastatidis
IEEE Transactions on Geoscience and Remote Sensing
University of Leeds, Nov 1, 2019
Firstly, I would like to express my sincere gratitude to my supervisor, Mark Hildyard, for his su... more Firstly, I would like to express my sincere gratitude to my supervisor, Mark Hildyard, for his support, advice and encouragement, for creating a friendly research environment and being more than a supervisor over the last few years. I would like to thank Andy Nowacki who acted as a second supervisor and who has helped and encouraged my work over the last two years. The work in this thesis has been greatly improved by their contribution. Besides my supervisors, I would like to thank Graham Stuart and Doug Angus for their insightful comments during the first part of my PhD, as supervisors. My sincere thanks also goes to Will Flynn and Nicola Mathews from Itasca U.K., Suikkanen Johannes from Posiva and Noora Riihiluoma from Geofcon who gave access to survey data and provided me with the relevant technical reports. Without they precious support it would not be possible to conduct this research. I thank Jim Hazzard and all Itasca team for providing training and technical support both remotely and during my time in the Itasca office in Minneapolis.
Rock Mechanics and Rock Engineering
Seismic waves can be an effective probe to retrieve fracture properties particularly when measure... more Seismic waves can be an effective probe to retrieve fracture properties particularly when measurements are coupled with forward and inverse modelling. These seismic models then need an appropriate representation of the fracturing. The fractures can be modelled either explicitly, considering zero thickness frictional slip surfaces, or by considering an effective medium which incorporates the effect of the fractures into the properties of the medium, creating anisotropy in the wave velocities. In this work, we use a third approach which is a hybrid of the previous two. The area surrounding the predefined fracture is treated as an effective medium and the rest of the medium is made homogeneous and isotropic, creating a Localised Effective Medium (LEM). LEM can be as accurate as the explicit but more efficient in run-time. We have shown that the LEM model can closely match an explicit model in reproducing waveforms recorded in a laboratory experiment, for wave propagating parallel and p...
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Papers by Emmanouil Parastatidis