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Effects of seismic anisotropy and attenuation on first-arrival waveforms recorded at the Asse II nuclear repository

Sortan, Sonia-Adelina ORCID iD icon 1
1 Geophysikalisches Institut (GPI), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

For decades, deep geological storage in former salt mines has been a widely recognized strategy for long-term radioactive waste disposal. However, in the case of the Asse II repository in Lower Saxony, groundwater inflow and instabilities in the geological structures rendered the mine unusable as a long-term solution. The nuclear waste needs to be recovered on grounds of safety reasons, hence the need for detailed structural information in order to build a new shaft. In this context, it is essential to use optimized, modern seismic imaging methods, such as, for instance, full-waveform inversion (FWI), to obtain high-resolution, physical parameter models of the Asse salt structure and its surroundings.

The goal of this thesis is to draw conclusions on the future application of elastic FWI using first-arrival waveforms at frequencies up to 20 Hz, potentially including anisotropy and attenuation. For this purpose, simple parameter models were created based on previously known geological information and used as references for synthetic forward modeling tests. The objectives were (a) to see if the models are suitable as initial models for FWI, (b) to assess what type of anisotropy needs to be considered, if at all, and (c) to investigate the significance of attenuation. ... mehr


Volltext §
DOI: 10.5445/IR/1000151635
Veröffentlicht am 25.10.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Hochschulschrift
Publikationsjahr 2022
Sprache Englisch
Identifikator KITopen-ID: 1000151635
Verlag Karlsruher Institut für Technologie (KIT)
Umfang VI, 69 S.
Art der Arbeit Abschlussarbeit - Master
Vorab online veröffentlicht am 19.10.2022
Schlagwörter seismic anisotropy, attenuation, radioactive waste, finite differences
Referent/Betreuer Bohlen, Thomas
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