Details
| Original language | English |
|---|---|
| Article number | 104614 |
| Number of pages | 9 |
| Journal | Journal of Applied Geophysics |
| Volume | 200 |
| Early online date | 20 Mar 2022 |
| Publication status | Published - May 2022 |
Abstract
We carried out a small-scale 3-D seismic survey (120 × 120 m2, bin size 1.5 m) in advance of a research borehole. The target consists of 150 m of Quaternary sediments in a glacially overdeepened valley. We used a wheelbarrow-mounted electrodynamic vibrator as seismic source and chose a simple orthogonal layout. During one week of acquisition, we fired 1024 shots into 384 vertical geophones. The key processing step was the interpolation and regularization of traces, realized by common reflection surface (CRS) processing. This enhances data quality in low fold regions at small offsets. Despite the small source, the entire Quaternary fill and the base of the valley is imaged well. At a depth of 20–50 m, glaciotectonic deformation, in the form of cuspate-lobate folds, is visible, which was not recognized previously in a 2-D seismic profile that runs along the edge of the 3-D area. The folding indicates that compressional glacial stresses acted on layers of stiff till and less competent clastics. We interpret that the varying fold axes' directions indicate varying stress fields during the Last Glacial Maximum. Cuspate-lobate folding has hitherto not been used to describe the deformation of glacial sediments.
Keywords
- 3-D seismic data, CRS-processing, Cuspate-lobate folding, Electrodynamic seismic vibrator, Glacial sediments
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
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In: Journal of Applied Geophysics, Vol. 200, 104614, 05.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Cuspate-lobate folding in glacial sediments revealed by a small-scale 3-D seismic survey
AU - Buness, Hermann
AU - Tanner, David Colin
AU - Burschil, Thomas
AU - Gabriel, Gerald
AU - Wielandt-Schuster, Ulrike
N1 - Funding Information: We thank Frau Hannelore and Herr Johannes Wiedmann for permission to acquire seismic on their land, and our technical staff Jan Bayerle, Jan Bergmann-Baroccas and Erwin Wagner for assistance in the field. Anne-Marie Pogoda-Dorsch drew the cartoon in Fig. 11. We acknowledge funding by the German Research Foundation, grant BU2467/2.
PY - 2022/5
Y1 - 2022/5
N2 - We carried out a small-scale 3-D seismic survey (120 × 120 m2, bin size 1.5 m) in advance of a research borehole. The target consists of 150 m of Quaternary sediments in a glacially overdeepened valley. We used a wheelbarrow-mounted electrodynamic vibrator as seismic source and chose a simple orthogonal layout. During one week of acquisition, we fired 1024 shots into 384 vertical geophones. The key processing step was the interpolation and regularization of traces, realized by common reflection surface (CRS) processing. This enhances data quality in low fold regions at small offsets. Despite the small source, the entire Quaternary fill and the base of the valley is imaged well. At a depth of 20–50 m, glaciotectonic deformation, in the form of cuspate-lobate folds, is visible, which was not recognized previously in a 2-D seismic profile that runs along the edge of the 3-D area. The folding indicates that compressional glacial stresses acted on layers of stiff till and less competent clastics. We interpret that the varying fold axes' directions indicate varying stress fields during the Last Glacial Maximum. Cuspate-lobate folding has hitherto not been used to describe the deformation of glacial sediments.
AB - We carried out a small-scale 3-D seismic survey (120 × 120 m2, bin size 1.5 m) in advance of a research borehole. The target consists of 150 m of Quaternary sediments in a glacially overdeepened valley. We used a wheelbarrow-mounted electrodynamic vibrator as seismic source and chose a simple orthogonal layout. During one week of acquisition, we fired 1024 shots into 384 vertical geophones. The key processing step was the interpolation and regularization of traces, realized by common reflection surface (CRS) processing. This enhances data quality in low fold regions at small offsets. Despite the small source, the entire Quaternary fill and the base of the valley is imaged well. At a depth of 20–50 m, glaciotectonic deformation, in the form of cuspate-lobate folds, is visible, which was not recognized previously in a 2-D seismic profile that runs along the edge of the 3-D area. The folding indicates that compressional glacial stresses acted on layers of stiff till and less competent clastics. We interpret that the varying fold axes' directions indicate varying stress fields during the Last Glacial Maximum. Cuspate-lobate folding has hitherto not been used to describe the deformation of glacial sediments.
KW - 3-D seismic data
KW - CRS-processing
KW - Cuspate-lobate folding
KW - Electrodynamic seismic vibrator
KW - Glacial sediments
UR - http://www.scopus.com/inward/record.url?scp=85126938106&partnerID=8YFLogxK
U2 - 10.1016/j.jappgeo.2022.104614
DO - 10.1016/j.jappgeo.2022.104614
M3 - Article
AN - SCOPUS:85126938106
VL - 200
JO - Journal of Applied Geophysics
JF - Journal of Applied Geophysics
SN - 0926-9851
M1 - 104614
ER -