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Journal: First Break

Abbreviation

First break

Publisher

European Association of Geoscientists & Engineers

ISSN

0263-5046
1365-2397

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Publications1 - 10 of 10

Using effective medium theory to better constrain full-waveform inversion
Afanasiev, Michael; Boehm, Christian; May, Dave; et al. (2016)
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Microtremor spectra
Green, Alan; Greenhalgh, Stewart A. (2009)
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Developments and applications of archaeo-geophysics within Switzerland
Hertrich, Marian; Jie-A-Looi, Mitch; Vrzba, Miroslav; et al. (2010)
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Hydrogeophysical studies in unrestored and restored river corridors of the Thur River, Switzerland
Linde, Niklas; Coscia, Ilaria; Doetsch, Joseph; et al. (2010)
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A comprehensive seismic characterisation via multi-component analysis of active and passive data
Dal Moro, G.; Keller, L.; Poggi, V. (2015)
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Geophysical characterization of slope instabilities
Maurer, Hansruedi; Spillmann, Thomas; Heincke, Björn; et al. (2010)
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Geophysics applied to nuclear waste disposal investigations in Switzerland
Spillmann, T.; Blümling, P.; Manukyan, E.; et al. (2010)
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Full-fold, multi-source acquisition through shot isolation technology and its implications on productivity gains
Eggenberger, Kurt; Robertsson, Johan O.A.; Andersson, Fredrik; et al. (2017)
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Shot isolation enabled full-fold, multi-source acquisition is achieved by applying the novel technology of signal apparition to the encoding and decoding of fully superimposed shot records from non-distance separated sources. The introduction of periodically varying shot-to-shot modulation functions for encoding injects energy at predetermined positions within distinct wavenumber ranges, which then enables a deterministic decoding of individual shots in data processing. We demonstrate the method for single vessel operations, first on a dual source configuration for seabed acquisition, extracted from the SEG Advanced Modeling Program (SEAM) Phase I dataset, and then extend the methodology to triple-sources through the use of an emulated marine real data example from the North Sea. With shot isolation enabled multi-source acquisition being successfully applied in a marine and seabed seismic context, scope for significant productivity gains is created. Compared to established acquisition techniques, gains arise from the ability to acquire full-fold data in a shorter time frame without compromising the subsurface bin size. For marine seismic acquisition, this also implies that the number of towed streamers can be reduced, giving leeway to additional strategic considerations on subjects such as capital expenditures and the optimization of vessel deployment plans.
Seismic wavefield divergence at the free surface
Edme, Pascal; Muyzert, Everhard; Goujon, Nicolas; et al. (2018)
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This paper explores the concept of pressure measurements in a land seismic acquisition setting. We first review the theory for pressure measurements near the surface of the Earth and show the significance of the S-to-P conversion which results in the pressure being proportional to the sum of the slowness-scaled horizontal velocity fields. In the second part of this paper we test a land hydrophone prototype via a small-scale experiment to validate the pseudo-pressure measurement. Potential applications are briefly discussed. This study suggests that such a land hydrophone can potentially allow local and omni-directional noise attenuation, via adaptive subtraction using the pseudo-pressure data as noise model, and therefore can potentially allow sparser acquisition geometries with associated field effort and cost reduction.
Signal apparition applied to towed marine simultaneous sources-a case study on synhesized real data from the Viking Graben
Eggenberger, Kurt; Robertsson, Johan O.A.; Andersson, Fredrik; et al. (2016)
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