Implications of Vp/Vs ratio on shallow P and S reflection correlation and lithology discrimination

Bailey, Bevin L.; Miller, Richard D.; Peterie, Shelby L.; Ivanov, Julian; Markiewicz, Richard D.

doi:10.1190/segam2013-1107.1

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Bailey et al . (2013) associate high V P / V S to an increased porosity, saturation and clay content, all of which are conditions present in this study area. The same observations can be made in all the lines.…”

Section: Results and Interpretationssupporting

confidence: 56%

“…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: 52%

“…Deposits with higher clay content may have V P / V S equal to 8–9 (Bailey et al . 2013). However, the V P / V S 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.…”

Section: Results and Interpretationsmentioning

confidence: 99%

“…The groundwater level according to the borehole data(Salas- Romero et al 2016) was at 2 m of depth in this profile, thus all materials below it were considered fully saturated. Deposits with higher clay content may have VP/VS equal to 8-9(Bailey et al 2013). 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.…”

mentioning

confidence: 99%

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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

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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.

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Section: Results and Interpretationssupporting

confidence: 56%

mentioning

confidence: 52%

Section: Results and Interpretationsmentioning

confidence: 99%

mentioning

confidence: 99%

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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

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Tunnel detection at Yuma Proving Ground, Arizona, USA — Part 1: 2D full-waveform inversion experiment

et al. 2019

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We have applied time domain 2D full-waveform inversion (FWI) to detect a known 10 m deep wood-framed tunnel at Yuma Proving Ground, Arizona. The acquired seismic data consist of a series of 2D survey lines that are perpendicular to the long axis of the tunnel. With the use of an initial model estimated from surface wave methods, a void-detection-oriented FWI workflow was applied. A straightforward [Formula: see text] quotient masking method was used to reduce the inversion artifacts and improve confidence in identifying anomalies that possess a high [Formula: see text] ratio. Using near-surface FWI, [Formula: see text] and [Formula: see text] velocity profiles were obtained with void anomalies that are easily interpreted. The inverted velocity profiles depict the tunnel as a low-velocity anomaly at the correct location and depth. A comparison of the observed and simulated waveforms demonstrates the reliability of inverted models. Because the known tunnel has a uniform shape and for our purposes an infinite length, we apply 1D interpolation to the inverted [Formula: see text] profiles to generate a pseudo 3D (2.5D) volume. Based on this research, we conclude the following: (1) FWI is effective in near-surface tunnel detection when high resolution is necessary. (2) Surface-wave methods can provide accurate initial S-wave velocity [Formula: see text] models for near-surface 2D FWI.

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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

et al. 2019

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Abstract. 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. These data can be analyzed 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 have recently been 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 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 the acquisition and processing of similar datasets.

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Implications of Vp/Vs ratio on shallow P and S reflection correlation and lithology discrimination

Cited by 3 publications

References 8 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

Tunnel detection at Yuma Proving Ground, Arizona, USA — Part 1: 2D full-waveform inversion experiment

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

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Implications of Vp/Vs ratio on shallow P and S reflection correlation and lithology discrimination

Cited by 3 publications

References 8 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

Tunnel detection at Yuma Proving Ground, Arizona, USA — Part 1: 2D full-waveform inversion experiment

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

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