Ground instability of sinkhole areas indicated by elastic moduli and seismic attributes

dc.bibliographicCitation.firstPage289eng
dc.bibliographicCitation.issue1eng
dc.bibliographicCitation.lastPage304eng
dc.bibliographicCitation.volume222eng
dc.contributor.authorWadas, S.H.
dc.contributor.authorTschache, S.
dc.contributor.authorPolom, U.
dc.contributor.authorKrawczyk, C.M.
dc.date.accessioned2021-11-08T09:36:24Z
dc.date.available2021-11-08T09:36:24Z
dc.date.issued2020
dc.description.abstractElastic moduli derived from vertical seismic profiles (VSPs) and 2-D SH-wave reflection seismic profiles are used to characterize mechanical properties of rocks in sinkhole areas. VP and VS were used to calculate the Poisson's ratio and the dynamic shear modulus. The study shows that 2-D shear wave reflection seismics is suited to depict the heterogeneities of the subsurface induced by subsurface erosion. Low shear wave velocities of ca. 120-350 m s-1 and low shear strength values between 25 and 250 MPa are identified for the subsurface erosion horizon that consists of soluble Permian evapourites and the disturbed overlying deposits. These low values are a result of cavities and fractures induced by dissolution, creating unstable zones. In compliance with the shear modulus the Poisson's ratio derived from the VSPs shows values of 0.38-0.48 for both the presumed subsurface erosion horizon, and the deposits above. This is a further indicator of reduced underground stability. In the VSPs, anomalies of the shear modulus and the Poisson's ratio correlate with low electrical resistivities of less than 10 ωm from borehole logs, indicating high conductivity due to fluid content. Further investigation reveals a conversion of S-to-P wave for the subsurface erosion horizon, which is probably the result of dipping layers and an oriented fracture network. Seismic attribute analysis of the 2-D sections shows strong attenuation of high frequencies and low similarity of adjacent traces, which correlate with the degree of subsurface erosion induced wave disturbance of the underground. © 2020 The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/7206
dc.identifier.urihttps://doi.org/10.34657/6253
dc.language.isoengeng
dc.publisherOxford : Oxford Univ. Presseng
dc.relation.doihttps://doi.org/10.1093/gji/ggaa167
dc.relation.essn1365-246X
dc.relation.ispartofseriesGeophysical Journal International 222 (2020), Nr. 1eng
dc.relation.issn0956-540X
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subjectlow velocity zoneeng
dc.subjectPoisson's ratioeng
dc.subjectseismic attributeseng
dc.subjectshear moduluseng
dc.subjectsinkholeeng
dc.subjectsubsurface erosioneng
dc.subject.ddc550eng
dc.titleGround instability of sinkhole areas indicated by elastic moduli and seismic attributeseng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleGeophysical Journal Internationaleng
tib.accessRightsopenAccesseng
wgl.contributorLIAGeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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