Overview of high resolution seismic prospecting in pre-Alpine and Alpine basins

Franco, R. de; Biella, G.; Caielli, Grazia; Berra, Fabrizio; Guglielmin, Mauro; Lozej, A.; Piccin, Andrea; Sciunnach, Dario

doi:10.1016/j.quaint.2009.02.011

Cited by 15 publications

(24 citation statements)

References 5 publications

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“…11 shows a compilation of the 1D-velocity models in the over-deepened section. In general, the P-wave velocities in the 15 range 1200 -2700 m/s correspond to those established for other Quaternary alpine valley fills (Brueckl et al, 2010;de Franco et al, 2009). In Fig.…”

Section: Interpretation and Discussionsupporting

confidence: 85%

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Passive processing of active nodal seismic data: Estimation of VP / VS-ratios to characterize structure and hydrology of an alpine valley infill

Behm¹,

Cheng²,

Patterson³

et al. 2019

Preprint

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The advent of cable-free nodal arrays for conventional seismic reflection and refraction experiments is changing the acquisition style for active source surveys. Instead of triggering short recording windows for each shot, the nodes are continuously recording over the entire acquisition period from the first to the last shot. The main benefit is a significant increase in geometrical and logistical flexibility. As a by-product, a significant amount of continuous data might also be collected. 10These data can be analysed with passive seismic methods and therefore offer the possibility to complement subsurface characterization at marginal additional cost. We present data and results from a 2.4 km long active source profile which has been recently acquired in Western Colorado (US) to characterize the structure and sedimentary infill of an over-deepened alpine valley. We show how the 'leftover' passive data from the active source acquisition can be processed towards a shear wave velocity model with seismic interferometry. The shear wave velocity model supports the structural interpretation of the 15 active P-wave data, and the P-to-S-wave velocity ratio provides new insights into the nature and hydrological properties of the sedimentary infill. We discuss the benefits and limitations of our workflow and conclude with recommendations for acquisition and processing of similar data sets.

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Section: Interpretation and Discussionsupporting

confidence: 85%

“…Alpine valleys are of interest for geophysical investigation because of their significance for landform evolution (e.g. incision rates, timing and effects of glacial overprinting; de Franco et al, 2009;Pomper et al, 2017) and their potential for harbouring significant groundwater resources (e.g. Pugin et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Passive processing of active nodal seismic data: Estimation of VP / VS-ratios to characterize structure and hydrology of an alpine valley infill

Behm¹,

Cheng²,

Patterson³

et al. 2019

Preprint

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“…Bedrock excavation along Valtellina can be explained by Messinian entrenchment (Bini et al ., ). Below the mainly alluvial and glacial Valtellina valley‐fill, as seen on a seismic profile acquired in Teglio (De Franco et al ., ), 34 km upstream of the Tartano fan, the U‐shaped bedrock may reach a depth of 250 m b.s.l. Differently, the geophysical data acquired in the study area or near to it (this work; Petrucci et al ., ) and the valley morphology suggest a depth of bedrock at its deepest point beneath the Tartano fan of about 40 m a.s.l.…”

Section: Setting and Physiography Of The Tartano Fanmentioning

confidence: 99%

Impact of the magnitude and frequency of debris‐flow events on the evolution of an alpine alluvial fan during the last two centuries: responses to natural and anthropogenic controls

Colombera¹,

Bersezio²

2011

Earth Surf Processes Landf

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The dynamics and the surface evolution of a post-LGM debris-flow-dominated alluvial fan (Tartano alluvial fan), which lies on the floor of an alpine valley (Valtellina, Northern Italy), have been investigated by means of an integrated study comprising geomorphological field work, a sedimentological study, photointerpretation, quantitative geomorphology, analysis of ancient to modern cartography and consultation of historical documents and records. The fan catchment meteoclimatic, geological and geomorphological characteristics result in fast rates of geomorphic reorganization of the fan surface (2 km 2 ). The dynamics of the fan are determined by the alternation of low-return period catastrophic alluvial events dominated by non-cohesive debris flows triggered by extreme rainstorms which caused aggradation and steepening of the fan and avulsion of its main channel, with periods of low to moderate streamflow discharge punctuated by low-to intermediate-magnitude flood events, causing slower but steady topographic reworking. The most ancient parts of the fan surface date back at least to the first half of the 19th century, but most of the fan surface has been restructured after 1911, mainly during the debris-flow-dominated events of 1911 and 1987. Phases of rapid fan toe incision and fan degradation have been recognized; since the 1930s or 1940s, the Tartano fan has been subjected to a state of deep entrenchment and narrowing of the main trunk channel and distributary area. Post-Little Ice Age climate change and presentday surface uplift rates have been considered as possible explanations for the observed geomorphic evolution, but tectonic or climatic controls cannot account for the order of magnitude of the erosional pace. Anthropogenic controls plausibly override the natural ones: in particular, the building of a dam in the late 1920s, about 2 km upstream of the fan, seems to have triggered fan dissection, having altered the sediment discharge through sediment retention.

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“…In contrast to studies of proximal basins (Pfiffner et al 1997;van Rensbergen et al 1998van Rensbergen et al , 1999de Franco et al 2009; Barnaba et al 2010;Brückl et al 2010;Reitner et al 2010;Dehnert et al 2012;Buechi et al 2017;Pomper et al 2017), only a few geophysical data are available from over-deepened basins in the German part of the Alpine foreland (Ehlers and Gibbard 2004;Ellwanger et al 2011). These basins are typically located distally to the corresponding catchment areas.…”

mentioning

confidence: 99%

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

Burschil

Buness

Tanner

et al. 2018

Near Surface Geophysics

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Over‐deepened basins exist throughout the Alpine realm. Improving our knowledge on these basins is of high social relevance, since these areas are often well‐populated and they possess, for instance, unusual hydrological settings. Nonetheless, geophysical and sedimentological investigations of over‐deepened basins are rare. We analyse the sedimentary succession of such a basin, the Tannwald Basin, through geological interpretation of seismic reflection profiles. The basin is located approximately 60 km north of the European Alps. It was incised into Tertiary molasse sediments by the Rhine Glacier and later filled by glacial, fluvial, and lacustrine deposits of 250 m thickness. The Leibniz Institute for Applied Geophysics acquired a grid of five high‐resolution seismic reflection lines that imaged till the deepest parts of the Tannwald Basin. The seismic profiles, processed to a pre‐stack depth migration level, allow a detailed geological interpretation that is calibrated with the help of a nearby borehole. We determine the structure and the seismic facies of the sediment succession in the basin and presume the following hypothesis of the evolution of the basin: sub‐glacial erosion comprises the excavation of the over‐deepened basin as well as detachment of large fragments of molasse material. These molasse slabs were deposited within the basin in a layer of basal till that graded upwards in water‐lain till and fine‐grained deposits. During the last two glaciations, the basinal structure became buried by till sequences and glacio‐fluvial sediments.

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Overview of high resolution seismic prospecting in pre-Alpine and Alpine basins

Cited by 15 publications

References 5 publications

Passive processing of active nodal seismic data: Estimation of V<sub>P</sub> / V<sub>S</sub>-ratios to characterize structure and hydrology of an alpine valley infill

Passive processing of active nodal seismic data: Estimation of V<sub>P</sub> / V<sub>S</sub>-ratios to characterize structure and hydrology of an alpine valley infill

Impact of the magnitude and frequency of debris‐flow events on the evolution of an alpine alluvial fan during the last two centuries: responses to natural and anthropogenic controls

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

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Overview of high resolution seismic prospecting in pre-Alpine and Alpine basins

Cited by 15 publications

References 5 publications

Passive processing of active nodal seismic data: Estimation of V&lt;sub&gt;P&lt;/sub&gt; / V&lt;sub&gt;S&lt;/sub&gt;-ratios to characterize structure and hydrology of an alpine valley infill

Passive processing of active nodal seismic data: Estimation of V&lt;sub&gt;P&lt;/sub&gt; / V&lt;sub&gt;S&lt;/sub&gt;-ratios to characterize structure and hydrology of an alpine valley infill

Impact of the magnitude and frequency of debris‐flow events on the evolution of an alpine alluvial fan during the last two centuries: responses to natural and anthropogenic controls

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

Contact Info

Product

Resources

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Passive processing of active nodal seismic data: Estimation of V<sub>P</sub> / V<sub>S</sub>-ratios to characterize structure and hydrology of an alpine valley infill

Passive processing of active nodal seismic data: Estimation of V<sub>P</sub> / V<sub>S</sub>-ratios to characterize structure and hydrology of an alpine valley infill