Integrating S‐wave seismic‐reflection data and cone penetration test data using a multiangle multiscale approach

Ghose, Ranajit; Goudswaard, Jeroen

doi:10.1190/1.1707064

Cited by 54 publications

(57 citation statements)

References 24 publications

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“…We use Swaves instead of P-waves because S-waves provide higher resolution in soft soils, their velocity is linked to the stiffness, and S-waves are more sensitive to changes in the soil type (Ghose and Goudswaard, 2004). To record S-waves, we use horizontal sources and horizontal particle-velocity receivers.…”

Section: Description Of the Modeling Studiesmentioning

confidence: 99%

Imaging scatterers in landfills using seismic interferometry

et al. 2013

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A significant problem with landfills is their aftercare period. A landfill is considered to be safe for the environment only after a relatively long period of time. Until it reaches such a condition, it has to be periodically treated. Not only are treatments very expensive, but they could be dangerous as well; for example, when barriers limiting the waste break. So far, there is no established technique that can predict the leachate and gas-emission potential of a landfill, especially in time-lapse monitoring. This potential depends on the channeling of fluids due to the presence of highdensity waste areas and the redistribution of the channels with time. We propose to use seismic interferometry (SI) applied to active reflection seismics to help improve the image of the waste areas (scatterers) and to monitor the subsurface changes in time. Normally, application of SI to reflection recordings from active sources at the surface would result in an erroneous retrieved result, but secondary illumination of the receivers from strongly scattering subsurface, like a landfill, would remedy this problem. We conduct modeling studies to examine the possible benefits of this approach compared to using the conventional seismic reflection method. We show that the reflections retrieved from SI can be used to obtain a clearer image of the shallower scatterers. In addition, we illustrate that time-lapse monitoring using reflections retrieved by SI shows a more repeatable result than the conventional approach in case of source nonrepeatability.

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Section: Description Of the Modeling Studiesmentioning

confidence: 99%

Imaging scatterers in landfills using seismic interferometry

et al. 2013

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“…Ghose and Goudswaard, 2004). In this research, we have applied the S-wave seismic reflection method to fault location in the Lower Tagus Valley at V. F. de Xira.…”

Section: Introductionmentioning

confidence: 99%

The Signature of a Small-throw Fault Affecting Unconsolidated Sediments in S-wave Reflection Seismic Data

Carvalho¹,

Ghose²,

Loureiro³

2012

Proceedings

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SUMMARYThe definition of appropriate places for the development of paleoseismic studies is extremely important in earthquake engineering site investigations. The seismic reflection method is routinely used to locate shallow fault segments where these do not outcrop, like in low slip-rate areas where faults identified in Quaternary sediments have vertical throws less than 2 m. The Lower Tagus Valley (Portugal), covered by 50 m of alluvium sediments, is one of these areas. To find fault segments in this geological environment is a daunting task. Any displacement in the seismic data can be a velocity anomalies and/or statics effect. To illuminate the presence of a fault in Holocene sediments, we acquired an S-wave seismic reflection profile at V. F. de Xira and modelled the response of a fault segment in order to recognise it in our data. The signature of a fault segment can be a change in the shape/attitude of the reflection hyperbolae but reflections from the fault plane are rather weak. These are controlled by fault width and velocity contrast between damaged zone-adjacent sediments. The resemblance between the modelled and field data of V. F. Xira supports the conclusion that the fault affects the Holocene alluvium and is still active.

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“…On land, particular effort has been put into shear waves when the top layers are of the soft-soil type (e.g., Ghose and Goudswaard, 2004). Shear waves are not sensitive to the pore contents of the rock or soil, giving advantages over P-wave seismic surveys, especially when target depths are above the water table and/or in the "weathered" layer.…”

Section: Introductionmentioning

confidence: 99%

Nongeometrically converted shear waves in marine streamer data

et al. 2012

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Under certain circumstances, marine streamer data contain nongeometrical shear body wave arrivals that can be used for imaging. These shear waves are generated via an evanescent compressional wave in the water and convert to propagating shear waves at the water bottom. They are called "nongeometrical" because the evanescent part in the water does not satisfy Snell's law for real angles, but only for complex angles. The propagating shear waves then undergo reflection and refraction in the subsurface, and arrive at the receivers via an evanescent compressional wave. The required circumstances are that sources and receivers are near the water bottom, irrespective of the total water depth, and that the shear-wave velocity of the water bottom is smaller than the P-wave velocity in the water, most often the normal situation. This claim has been tested during a seismic experiment in the river Danube, south of Budapest, Hungary. To show that the shear-related arrivals are body rather than surface waves, a borehole was drilled and used for multicomponent recordings. The streamer data indeed show evidence of shear waves propagating as body waves, and the borehole data confirm that these arrivals are refracted shear waves. To illustrate the effect, finite-difference modeling has been performed and it confirmed the presence of such shear waves. The streamer data were subsequently processed to obtain a shear-wave refraction section; this was obtained by removing the Scholte wave arrival, separating the wavefield into different refracted arrivals, stacking and depth-converting each refracted arrival before adding the different depth sections together. The obtained section can be compared directly with the standard P-wave reflection section. The comparison shows that this approach can deliver refracted-shear-wave sections from streamer data in an efficient manner, because neither the source nor receivers need to be situated on the water bottom.

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Integrating S‐wave seismic‐reflection data and cone penetration test data using a multiangle multiscale approach

Cited by 54 publications

References 24 publications

Imaging scatterers in landfills using seismic interferometry

Imaging scatterers in landfills using seismic interferometry

The Signature of a Small-throw Fault Affecting Unconsolidated Sediments in S-wave Reflection Seismic Data

Nongeometrically converted shear waves in marine streamer data

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