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Three-component seismic land streamer study of an esker architecture through S- and surface-wave imaging
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0003-4694-9847
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0003-1241-2988
Geological Survey of Canada, Ontario, Canada.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2018 (English)In: Geophysics, ISSN 0016-8033, E-ISSN 1942-2156, Vol. 83, no 6, p. B339-B353Article in journal (Refereed) Published
Abstract [en]

We deployed a newly developed 3C microelectromechanical system-based seismic land streamer over porous glacial sediments to delineate water table and bedrock in Southwestern Finland. The seismic source used was a 500 kg vertical impact drop hammer. We analyzed the SH-wave component and interpreted it together with previously analyzed P-wave component data. In addition to this, we examined the land streamer’s potential for multichannel analysis of surface waves and delineated the site’s stratigraphy with surface-wave-derived S-wave velocities and VP∕VS ratios along the entire profile. These S-wave velocities and VP∕VS ratios complement the interpretation conducted previously on P-wave stacked section. Peculiarly, although the seismic source used is of a vertical-type nature, the data inspection indicated clear bedrock reflection on the horizontal components, particularly the transverse component. This observation led us to scrutinize the horizontal component data through side-by-side inspection of the shot records of all the three components and particle motion analysis to confirm the S-wave nature of the reflection. Using the apparent moveout velocity of the reflection, as well as the known depth to bedrock based on drilling, we used finite-difference synthetic modeling to further verify its nature. Compared with the P-wave seismic section, bedrock is relatively well delineated on the transverse component S-wave section. Some structures connected to the kettle holes and other stratigraphic units imaged on the P-wave results were also notable on the S-wave section, and particularly on the surface-wave derived S-wave velocity model and VP∕VS ratios. Our results indicate that P-, SV-, and SH-wave energy is generated simultaneously at the source location itself. This study demonstrates the potential of 3C seismic for characterization and delineation of the near-surface seismics.

Place, publisher, year, edition, pages
2018. Vol. 83, no 6, p. B339-B353
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-366908DOI: 10.1190/GEO2017-0747.1ISI: 000457502000033OAI: oai:DiVA.org:uu-366908DiVA, id: diva2:1265936
Funder
Swedish Research Council Formas, 252-2012-1907Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2019-03-18Bibliographically approved

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