Spatial wavefield gradient-based seismic wavefield separation
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Date
2018-03
Publication Type
Journal Article
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Abstract
Measurements of the horizontal and vertical components of particle motion combined with estimates of the spatial gradients of the seismic wavefield enable seismic data to be acquired and processed using single dedicated multicomponent stations (e.g. rotational sensors) and/or small receiver groups instead of large receiver arrays. Here, we present seismic wavefield decomposition techniques that use spatial wavefield gradient data to separate land and ocean bottom data into their upgoing/downgoing and P/S constituents. Our method is based on the elastodynamic representation theorem with the derived filters requiring local measurements of the wavefield and its spatial gradients only. We demonstrate with synthetic data and a land seismic field data example that combining translational measurements with spatial wavefield gradient estimates allows separating seismic data recorded either at the Earth’s free-surface or at the sea bottom into upgoing/downgoing and P/S wavefield constituents for typical incidence angle ranges of body waves. A key finding is that the filter application only requires knowledge of the elastic properties exactly at the recording locations and is valid for a wide elastic property range.
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published
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Journal / series
Volume
212 (3)
Pages / Article No.
1588 - 1599
Publisher
Oxford University Press
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Subject
Numerical modelling; Body waves; Rotational seismology; Wave propagation
Organisational unit
03953 - Robertsson, Johan / Robertsson, Johan
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
Funding
156996 - BRINGING MULTICOMPONENT SEISMICS TO THE NEXT LEVEL: SEISMIC WAVEFIELD GRADIENT EXPLORATION (SNF)