Combined seismic and borehole investigation of the deep granite weathering structure—Santa Gracia Reserve case in Chile

dc.contributor.authorTrichandi, Rahmantara
dc.contributor.authorBauer, Klaus
dc.contributor.authorRyberg, Trond
dc.contributor.authorScherler, Dirk
dc.contributor.authorBataille, Klaus
dc.contributor.authorKrawczyk, Charlotte M.
dc.contributor.otherWiley
dc.date.accessioned2022-11-09T14:40:18Z
dc.date.available2022-11-09T14:40:18Z
dc.date.issued2022-07-28
dc.description.abstractImaging the critical zone at depth, where intact bedrock transforms into regolith, is critical in understanding the interaction between geological and biological processes. We acquired a 500 m-long near-surface seismic profile to investigate the weathering structure in the Santa Gracia National Reserve, Chile, which is located in a granitic environment in an arid climate. Data processing comprised the combination of two seismic approaches: (1) body wave tomography and (2) multichannel analysis of surface wave (MASW) with Bayesian inversion. This allowed us to derive P-wave and S-wave velocity models down to 90 and 70 m depth, respectively. By calibrating the seismic results with those from an 87 m-deep borehole that is crossed by the profile. We identified the boundaries of saprolite, weathered bedrock, and bedrock. These divisions are indicated in the seismic velocity variations and refer to weathering effects at depth. The thereby determined weathering front in the borehole location can be traced down to 30 m depth. The modelled lateral extent of the weathering front, however, cannot be described by an established weathering front model. The discrepancies suggest a more complex interaction between different aspects such as precipitation and topography in controlling the weathering front depth.en
dc.description.sponsorshipDFG, 255469939, SPP 1803: EarthShape: Earth Surface Shaping by Biota
dc.identifier.eissn1096-9837
dc.identifier.issn0197-9337
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/17649
dc.identifier.urihttps://doi.org/10.14279/depositonce-16433
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc550 Geowissenschaftende
dc.subject.otherboreholeen
dc.subject.othergeophysicsen
dc.subject.otherBayesian inversionen
dc.subject.otherbody wave tomographyen
dc.subject.othercritical zoneen
dc.subject.othergeomorphologyen
dc.subject.otherRayleigh waveen
dc.subject.otherregolithen
dc.subject.otherseismic surveyen
dc.subject.othersurface wave tomographyen
dc.titleCombined seismic and borehole investigation of the deep granite weathering structure—Santa Gracia Reserve case in Chileen
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.doi10.1002/esp.5457
dcterms.bibliographicCitation.issue14
dcterms.bibliographicCitation.journaltitleEarth Surface Processes and Landforms
dcterms.bibliographicCitation.originalpublishernameWiley
dcterms.bibliographicCitation.originalpublisherplaceNew York, NY
dcterms.bibliographicCitation.pageend3316
dcterms.bibliographicCitation.pagestart3302
dcterms.bibliographicCitation.volume47
tub.accessrights.dnbfree
tub.affiliationTechnische Universität Berlin::Fak. 6 Planen Bauen Umwelt::Inst. Angewandte Geowissenschaften::FG Angewandte Geophysik
tub.publisher.universityorinstitutionTechnische Universität Berlin
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