Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces
We invert large-aperture seismic reflection and refraction data from a geologically complex area on the northeast Atlantic margin to jointly estimate seismic velocities and depths of major interfaces. Our approach combines this geophysical data information with prior information on seismic compressi...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1585 2023-05-15T17:41:32+02:00 Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces Bosch, M. Barton, P. J. Singh, S. C. Trinks, I. 2005 application/pdf http://eprints.esc.cam.ac.uk/1585/ http://eprints.esc.cam.ac.uk/1585/1/Bosch_M._et_al_Geophysics_70,4_%282005%29R33-R43.pdf https://doi.org/10.1190/1.1993712 en eng http://eprints.esc.cam.ac.uk/1585/1/Bosch_M._et_al_Geophysics_70,4_%282005%29R33-R43.pdf Bosch, M. and Barton, P. J. and Singh, S. C. and Trinks, I. (2005) Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces. Geophysics, 70 (4). pp. 33-43. DOI https://doi.org/10.1190/1.1993712 <https://doi.org/10.1190/1.1993712> 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2005 ftucambridgeesc https://doi.org/10.1190/1.1993712 2020-08-27T18:08:55Z We invert large-aperture seismic reflection and refraction data from a geologically complex area on the northeast Atlantic margin to jointly estimate seismic velocities and depths of major interfaces. Our approach combines this geophysical data information with prior information on seismic compressional velocities and the structural interpretation of seismic sections. We constrain expected seismic velocities in the prior model using information from well logs from a nearby area. The layered structure and prior positions of the interfaces follow information from the seismic section obtained by processing the short offsets. Instead of using a conventional regularization technique to smooth the interface-velocity model, we describe the spatial correlation of interfaces and velocities with a geostatistical model, using a multivariate Gaussian probability density function. We impose a covariance function on the velocity field in each layer and on each interface in the model to control the smoothness of the solution. The inversion is performed by minimizing an objective function with two terms, one term measuring traveltime residuals and the other measuring the fit to the statistical model. We calculate the posterior uncertainties and evaluate the relative influence of data and the prior model on estimated interface depths and seismic velocities. The method results in the estimation of velocity and interface geometry beneath a basaltic sill system down to 7 km depth. This method aims to enhance the interpretation process by combining multidisciplinary information in a quantitative model-based approach. Article in Journal/Newspaper Northeast Atlantic University of Cambridge, Department of Earth Sciences: ESC Publications GEOPHYSICS 70 4 R33 R43 |
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Open Polar |
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University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
02 - Geodynamics Geophysics and Tectonics Bosch, M. Barton, P. J. Singh, S. C. Trinks, I. Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
We invert large-aperture seismic reflection and refraction data from a geologically complex area on the northeast Atlantic margin to jointly estimate seismic velocities and depths of major interfaces. Our approach combines this geophysical data information with prior information on seismic compressional velocities and the structural interpretation of seismic sections. We constrain expected seismic velocities in the prior model using information from well logs from a nearby area. The layered structure and prior positions of the interfaces follow information from the seismic section obtained by processing the short offsets. Instead of using a conventional regularization technique to smooth the interface-velocity model, we describe the spatial correlation of interfaces and velocities with a geostatistical model, using a multivariate Gaussian probability density function. We impose a covariance function on the velocity field in each layer and on each interface in the model to control the smoothness of the solution. The inversion is performed by minimizing an objective function with two terms, one term measuring traveltime residuals and the other measuring the fit to the statistical model. We calculate the posterior uncertainties and evaluate the relative influence of data and the prior model on estimated interface depths and seismic velocities. The method results in the estimation of velocity and interface geometry beneath a basaltic sill system down to 7 km depth. This method aims to enhance the interpretation process by combining multidisciplinary information in a quantitative model-based approach. |
format |
Article in Journal/Newspaper |
author |
Bosch, M. Barton, P. J. Singh, S. C. Trinks, I. |
author_facet |
Bosch, M. Barton, P. J. Singh, S. C. Trinks, I. |
author_sort |
Bosch, M. |
title |
Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
title_short |
Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
title_full |
Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
title_fullStr |
Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
title_full_unstemmed |
Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
title_sort |
inversion of travel-time data under a statistical model for seismic velocities and layer interfaces |
publishDate |
2005 |
url |
http://eprints.esc.cam.ac.uk/1585/ http://eprints.esc.cam.ac.uk/1585/1/Bosch_M._et_al_Geophysics_70,4_%282005%29R33-R43.pdf https://doi.org/10.1190/1.1993712 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
http://eprints.esc.cam.ac.uk/1585/1/Bosch_M._et_al_Geophysics_70,4_%282005%29R33-R43.pdf Bosch, M. and Barton, P. J. and Singh, S. C. and Trinks, I. (2005) Inversion of travel-time data under a statistical model for seismic velocities and layer interfaces. Geophysics, 70 (4). pp. 33-43. DOI https://doi.org/10.1190/1.1993712 <https://doi.org/10.1190/1.1993712> |
op_doi |
https://doi.org/10.1190/1.1993712 |
container_title |
GEOPHYSICS |
container_volume |
70 |
container_issue |
4 |
container_start_page |
R33 |
op_container_end_page |
R43 |
_version_ |
1766143135370444800 |