Using a local Monte Carlo strategy to assess 1-D velocity models from wide-angle seismic travel-time data and application to the Rockall Trough

Pearse, S.; Hobbs, R. W.; Bosch, Miguel

doi:10.1016/j.tecto.2008.07.017

Cited by 3 publications

References 11 publications

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Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging

Sanford

Hobbs²,

Brown³

et al. 2022

Pure Appl. Geophys.

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Imaging both within and beneath subsurface igneous sill complexes is a seismic exploration challenge. A significant aspect of this challenge is due to a lack of understanding of the interaction between the heterogeneous geological structures and the seismic wavefield which includes the seismic response to sub-resolution 'thin' sills. This study aims to provide some insight into the effect of subsurface sills have on the observed seismic wavefield. This is achieved through high resolution full-waveform elastic seismic modelling, using a realistic geological model developed from interpreted seismic data and statistics of sills from wireline logs. We find that little energy penetrates through the sill complex to a target reflector below the sill complex, which is consistent with real-world observations. This is due to a number of factors, including energy lost to strong internal multiples (stratigraphic filtering), converted modes and leaky guided waves within the sills. These processes remove energy from the primary transmitted wavefront, contributing to degraded seismic imaging. Whilst these are all fundamental physical limitations that cannot be overcome, further work should focus on the processing of seismic data to ensure that these aspects of the seismic wave-field around sill complexes are optimally treated within processing workflows.

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Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging

Sanford

Hobbs²,

Brown³

et al. 2022

Pure Appl. Geophys.

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Probabilistic Inverse Theory

Dębski¹

2010

Advances in Geophysics

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The uncertainty in layered models from wide-angle seismic data

Majdański

2013

GEOPHYSICS

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The analytical method of estimating the uncertainty in layered models is addressed to models obtained using a layer-stripping modeling strategy or forward modeling. It is based on a simple principle of small error propagation. There are two variants of the method: a simplified one that includes refraction and vertical reflections and one that also includes wide-angle reflections. Both give a quantitative estimation for the existing models. To allow for a simple analytical estimation, refracted waves are described using a head-wave approximation in constant velocity layers; wide angle reflection paths are also simplified. In the case of trial and error forward modeling, this method can help determine how well the used parameterization is reflected in the data and avoid over-fitting the structures. This is especially important because the forward modeling is very subjective and there is no method to assess the parameterization without generating alternative models. For inversion problems using the layer-stripping method, the analysis allows for a correct propagation of errors and will help to evaluate the effect of including a priori information with known uncertainty. As a result, the layer-stripping modeling strategy is worse than simultaneous inversion for layered models because it gives larger uncertainties.

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Using a local Monte Carlo strategy to assess 1-D velocity models from wide-angle seismic travel-time data and application to the Rockall Trough

Cited by 3 publications

References 11 publications

Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging

Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging

Probabilistic Inverse Theory

The uncertainty in layered models from wide-angle seismic data

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