Seismic anisotropy of Opalinus Clay: tomographic investigations using the infrastructure of an underground rock laboratory (URL)

dc.contributor.authorEsefelder, Roman
dc.contributor.authorWawerzinek, Britta
dc.contributor.authorLüth, Stefan
dc.contributor.authorGiese, Rüdiger
dc.contributor.authorKrawczyk, Charlotte M.
dc.date.accessioned2022-01-11T14:22:39Z
dc.date.available2022-01-11T14:22:39Z
dc.date.issued2021-11-27
dc.description.abstractSeismic anisotropy and attenuation make claystone formations difficult to characterize. On the other hand, in many geotechnical environments, precise knowledge of structure and elastic properties of clay formations is needed. In crystalline and rock salt underground structures, high-resolution seismic tomography and reflection imaging have proven a useful tool for structural and mechanical characterization at the scale of underground infrastructure (several deca- to hundreds of meters). This study investigates the applicability of seismic tomography for the characterization of claystone formations from an underground rock laboratory under challenging on-site conditions including anisotropy, strong attenuation and restricted acquisition geometry. The seismic tomographic survey was part of a pilot experiment in the Opalinus Clay of the Mont Terri Rock Laboratory, using 3-component geophones and rock anchors, which are installed 2 m within the rock on two levels, thus suppressing effects caused by the excavation damage zone. As a source, a pneumatic impact source was used. The survey covers two different facies types (shaly and carbonate-rich sandy), for which the elliptical anisotropy is calculated for direct ray paths by fitting an ellipse to the separated data for each facies. The tomographic inversion was done with a code providing a good grid control and enabling to take the seismic anisotropy into account. A-priori anisotropy can be attributed to the grid points, taking various facies types or other heterogeneities into account. Tomographic results, compared to computations using an isotropic velocity model, show that results are significantly enhanced by considering the anisotropy and demonstrate the ability of the approach to characterize heterogeneities of geological structures between the galleries of the rock laboratory.en
dc.description.sponsorshipBMBF, 02NUK053D, Verbundprojekt iCross: Integrität von Endlagersystemen für radioaktive Abfälle - Skalenübergreifendes Systemverständnis und Systemanalyse, Teilprojekt Den
dc.identifier.eissn1661-8734
dc.identifier.issn1661-8726
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/16110
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-14884
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc550 Geowissenschaftende
dc.subject.otherseismic anisotropyen
dc.subject.otherseismic tomographyen
dc.subject.otherOpalinus Clayen
dc.subject.otherMont Terrien
dc.subject.otherunderground rock laboratoryen
dc.titleSeismic anisotropy of Opalinus Clay: tomographic investigations using the infrastructure of an underground rock laboratory (URL)en
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber21en
dcterms.bibliographicCitation.doi10.1186/s00015-021-00398-2en
dcterms.bibliographicCitation.journaltitleSwiss Journal of Geosciencesen
dcterms.bibliographicCitation.originalpublishernameSpringer Natureen
dcterms.bibliographicCitation.originalpublisherplaceHeidelbergen
dcterms.bibliographicCitation.volume114en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Angewandte Geowissenschaftende
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.instituteInst. Angewandte Geowissenschaftende
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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