Surveying near-surface depocentres by means of shear wave seismics

Polom, Ulrich; Bagge, Meike; Wadas, Sonja; Winsemann, Jutta; Brandes, Christian; Binot, Franz; Krawczyk, Charlotte M.

doi:10.3997/1365-2397.31.8.70632

Cited by 29 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the VP/VS values are extremely high in the edges of the profile with values above 20, which seem unrealistic and not representative for saturated clays and sands. The high values of VP/VS in these positions may be related to a lower resolution of the VS and VP models in these areas and/or due to extremely low VS (studies in the same area,Polom et al 2013 andComina et al 2017, obtained similar values) Bailey et al (2013). associate high VP/VS to an increased porosity, saturation and clay content, all of which are conditions present in this study area.…”

mentioning

confidence: 54%

“…The model parameterization was similar in all the lines. Constant values for density (1.7 g/cm 3 ) and Poisson's ratio (0.48) were estimated from the data collected in previous studies (Polom et al 2013;Salas-Romero et al 2016, 2019. Halfspace depth was defined using the information from the extracted dispersion curves (0.5 max), resulting in an averaged value estimated for all the lines (26 m).…”

Section: Inversion Of Dispersion Curvesmentioning

confidence: 99%

“…This area has been subjected to numerous geophysical, geotechnical and hydrological surveys (Fig. 1, Adamczyk et al 2013Adamczyk et al , 2014Comina et al 2017;Dahlin et al 2013;Malehmir et al 2013a, b;Löfroth et al 2011;Lundberg et al 2014;Polom et al 2013;Salas-Romero et al 2016, 2019Shan et al 2014Shan et al , 2016Wang et al 2016). The main target of these different investigations was mostly quick-clay mapping.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Geotechnical site characterization using multichannel analysis of surface waves: A case study of an area prone to quick‐clay landslides in southwest Sweden

Salas-Romero

Malehmir

Snowball

et al. 2021

Near Surface Geophysics

View full text Add to dashboard Cite

Quick-clay landslides are important geohazards in Sweden, Norway, and Canada. While they have been studied using various geotechnical and geophysical methods, only a handful of seismic surveys have been reported for their studies. Here, we reprocess active-source seismic data from a quick-clay landslide site in southwest Sweden, to complement earlier studies of reflection imaging and first-break traveltime tomography with surface-wave dispersion analysis. Results suggest extremely low shear-wave velocities, even as low as 60-100 m/s. From a geotechnical perspective, this implies that the region classifies as a high-risk zone for landslides and construction purposes. High or anomalous values of Poisson's ratio (or similarly P-and S-wave velocity ratio) depicts a zone within the normally consolidated sediments that likely represents a coarse-grained layer, thus confirming earlier results from a number of boreholes drilled in the study area. Overall, the results present further support to the previous This article is protected by copyright. All rights reserved.2 hypothesis that the coarse-grained layer plays a major role in the formation and creation of quick-clay landslides in the study area. Additionally, an attempt to model the distribution of potential quick clays along one of the seismic profiles is performed by combination of the modelled geophysical properties and soil textures. This study illustrates the potential of seismic methods, and how integration of multiple geophysical properties and different data handling strategies can help to accurately characterise regions susceptible to quick-clay landslides.

show abstract

mentioning

confidence: 54%

Section: Inversion Of Dispersion Curvesmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Geotechnical site characterization using multichannel analysis of surface waves: A case study of an area prone to quick‐clay landslides in southwest Sweden

Salas-Romero

Malehmir

Snowball

et al. 2021

Near Surface Geophysics

View full text Add to dashboard Cite

show abstract

“…Near-surface applications started with refraction techniques but since 1980 significant progress has been made in seismic reflection surveying (Steeples 2005). In the beginning, P-waves (compressional waves) were mainly created by explosives or weight drops, but nowadays seismic vibrators of different sizes are at hand and can be used for P-wave as well as for S-wave (shear wave) surveys (e.g., Krawczyk et al 2012Krawczyk et al , 2013Polom et al 2013;Tamiru and Wiederhold 2020). These studies also show that seismic reflection methods work quite well in the unconsolidated sediments of the North European Lowlands despite only minor velocity contrasts between layers.…”

Section: Seismic Reflection Methodsmentioning

confidence: 99%

“…Large-scale investigations can often only be carried out in connection with research projects (e.g., BURVAL Working Group 2009). Convincing and meaningful studies concerning application of S-and/or P-wave seismic reflections in northern Germany, Denmark and Canada were presented by, e.g., Polom et al (2013), Krawczyk et al (2012Krawczyk et al ( , 2013, Pugin et al (2009Pugin et al ( , 2013; in combination with airborne electromagnetic surveys by Burschil et al (2012a, b), Jørgensen et al (2012), Høyer et al (2013), Tamiru and Wiederhold (2020); and in combination with direct-push by Hoffmann et al (2008). Recently Sun et al (2020) demonstrated the imaging of shallow groundwater resources in glacial deposits by high frequency data using an explosive seismic source.…”

Section: Introductionmentioning

confidence: 99%

Geophysical methods help to assess potential groundwater extraction sites

Wiederhold

Kallesøe

Kirsch

et al. 2021

Grundwasser - Zeitschrift der Fachsektion Hydrogeologie

View full text Add to dashboard Cite

Complex geology in glacial terrain makes groundwater exploration challenging for water supply companies. Abrupt lateral changes of geological conditions, for example, raise the risk of unsuccessful exploration drilling. At some locations, local water supply companies experience a large number of dry wells, raising the need for better exploration approaches. The use of geophysical techniques enables the detection and characterization of subsurface structures in terms of aquifers and aquitards.We present two examples in which seismic and resistivity methods are combined for subsurface characterization. A thrust structure is detected in the Varde study area in Denmark and a channel structure is mapped in the Hamburg-Sülldorf study area in Germany. The different imaging characteristics of seismic P‑ and S‑waves are demonstrated. The combination of seismic and resistivity methods enables delineating groundwater-bearing and groundwater-barrier layers down to a depth of 150 m.

show abstract

Near‐surface fault detection using high‐resolution shear wave reflection seismics at the CO2CRC Otway Project site, Australia

et al. 2016

View full text Add to dashboard Cite

High‐resolution, near‐surface, shear wave reflection seismic measurements were carried out in November 2013 at the CO2CRC Otway Project site, Victoria, Australia, with the aim to determine whether and, if so, where deeper faults reach the near subsurface. From a previous P wave 3‐D reflection seismic data set that was concentrated on a reservoir at 2 km depth, we can only interpret faults up to 400 m below sea level. For the future monitoring in the overburden of the CO2 reservoir it is important to know whether and how the faults continue in the subsurface. We prove that two regional fault zones do in fact reach the surface instead of dying out at depth. Individual first‐break signatures in the shot gathers along the profiles support this interpretation. However, this finding does not imply perforce communication between the reservoir and the surface in the framework of CO2 injection. The shear wave seismic sections are complementary to existing P wave volumes. They image with high resolution (better than 3 m vertically) different tectonic structures. Similar structures also outcrop on the southern coast of the Otway Basin. Both the seismic and the outcrops evidence the complex youngest structural history of the area.

show abstract

Surveying near-surface depocentres by means of shear wave seismics

Cited by 29 publications

References 0 publications

Geotechnical site characterization using multichannel analysis of surface waves: A case study of an area prone to quick‐clay landslides in southwest Sweden

Geotechnical site characterization using multichannel analysis of surface waves: A case study of an area prone to quick‐clay landslides in southwest Sweden

Geophysical methods help to assess potential groundwater extraction sites

Near‐surface fault detection using high‐resolution shear wave reflection seismics at the CO2CRC Otway Project site, Australia

Contact Info

Product

Resources

About