Airgun array developed with high resolution and deep penetration.
Brandsæter, H., Farestveit, A., and Ursin, B.
The Oil and Gas Journal, 1977, 75, 154-162.

Attenuation of coherent noise on marine seismic exploration using very long arrays.
Bjørn Ursin
Geophysical Prospecting, 1978, Volume 26, pp. 722-749.
Abstract   Full Text:  [  PDF  ]  

A new high-resolution or deep penetration airgun array
H. Brandsæter, A. Farestveit, and B. Ursin
Geophysics, 1979, Volume 44, pp. 865-879
Abstract   Full Text: [  PDF  ]  

Spatial filtering of marine seismic data
Bjørn Ursin
Geophysics, 1983, Volume 48, pp. 1611-1630
Abstract   Full Text: [  PDF  ]  

Interaction between airguns.
Vaage, S., Ursin, B., and Haugland, K.
Geophysical Prospecting, 1984, Volume 32, pp. 676-689.
Abstract   Full Text: [  PDF  ]  

Reply to Comment on "Interaction between airguns".
Vaage, S., Ursin, B., and Haugland, K.
Geophysical Prospecting, 1985, Volume 33, pp. 1067.
Abstract   Full Text: [  PDF  ]  

Reply to Further comment on "Interaction between airguns".
Vaage, S., Ursin, B., and Haugland, K.
Geophysical Prospecting, 1986, Volume 34, pp. 942-945.
Abstract   Full Text: [  PDF  ]  

Computation of signatures of linear airgun arrays.
Vaage, S., and Ursin, B.
Geophysical Prospecting 1987, Volume 35, pp. 281-287.
Abstract   Full Text: [  PDF  ]  

SEISMIC DATA PROCESSING

Demultiple:

Adaptive long-period multiple attenuation.
Brandsæter, H., and Ursin, B.
Geophysical Prospecting, 1979, Volume 27, pp. 709-725.
Abstract   Full Text: [  PDF  ]  

Model-based removal of water-layer multiple reflections
Guochun Lu, Bjørn Ursin, and Jan Lutro
Geophysics, 1999, Volume 64, pp. 1816-1827
Abstract   Full Text: [  PDF  ]  

A fast, modified parabolic Radon transform
Brahim Abbad , Bjørn Ursin, and Milton J. Porsani
Geophysics, 2011, Volume 76, no. 1, V11-V24
Abstract   Full Text:  [  PDF  ]  

Deconvolution:

Maximum likelihood estimation of seismic impulse responses.
Ursin, B., and Holberg, O.
Geophysical Prospecting, 1985, Volume 33, pp. 233-251. (Reprinted in Modeling, Identification and Control 6, 57-73.)
Abstract   Full Text:  [  PDF    Reprint  ]  

Identification of seismic reflections using singular value decomposition.
Ursin, B., and Zheng, Y.
Geophysical Prospecting, 1985, Volume 33, pp. 773-799. (Reprinted in Modeling, Identification and Control 7, 1-23.)
Abstract   Full Text:  [  PDF    Reprint  ]  

Seismic reflection estimation with coloured noise.
Ursin, B., de Matos Neto, J.B., and Porsani, M.J.
J. Seismic Exploration 1996, Volume 5, pp. 51-62.
Full Text:  [  PDF  ]

Methods for estimating the seismic reflection response
Bjørn Ursin
Geophysics, 1997, Volume 62, pp. 1990-1995
Abstract   Full Text: [  PDF  ]  

Mixed-phase deconvolution
Milton J. Porsani and Bjørn Ursin
Geophysics, 1998, Volume 63, pp. 637-647
Abstract   Full Text: [  PDF  ]  

Mixed-phase deconvolution and wavelet estimation
Milton J. Porsani and Bjørn Ursin
The Leading Edge, 2000, Volume 19, pp. 76-79
Abstract   Full Text: [  PDF ]  

Estimation of an optimal mixed-phase inverse filter
Bjørn Ursin and Milton J. Porsani
Geophysical Prospecting, 2000, Volume 48,  Issue 4, pp. 663-676
Abstract   Full Text: [  PDF   Full text article  ]  

Comparison of deconvolution methods for scaling reflectivity.
Toverud, T., Dimri, V.P., and Ursin, B.
J. of Geophys., 22, 2001, 117-123.

Direct multichannel predictive deconvolution
Milton J. Porsani and Bjørn Ursin
Geophysics, 2007, Volume 72, H11-H27
Abstract   Full Text:  [  PDF  ]  

Signal estimation:

Seismic signal detection and parameter estimation.
Ursin, B.
Geophysical Prospecting, 1979, Volume 27, pp. 1-15.
Abstract   Full Text: [  PDF  ]  

Optimum stacking of seismic records with irregular noise
Yuriy Tyapkin and Bjørn Ursin
Journal of Geophysics and Engineering, 2005, Volume 2, 177-187
Abstract   Full Text:  [  PDF  ]  

Zero- and first-order approximations for least-squares estimation of seismic signal with coherent and random noise
Yuriy Tyapkin, Bjørn Ursin, Herve Perroud, Olena Silinska, and Olena Tiapkina
Journal of Geophysics and Engineering, 2010, Volume 7, 51-63
Abstract   Full Text:  [  PDF  ]  

SVD filtering applied to ground-roll attenuation
Milton J. Porsani, Michelângelo G. Silva, Paulo E. M. Melo, and Bjørn Ursin
Journal of Geophysics and Engineering, 2010, Volume 7, 284-289
Abstract   Full Text:  [  PDF  ]  

Dip-adaptive singular-value decomposition filtering for seismic reflection enhancement
Milton J. Porsani, Bjørn Ursin, Michelangelo G. Silva, and Paulo E. M. Melo
Geophysical Prospecting, 2013, Volume 61, no. 1, 42-52
Abstract   Full Text:  [  PDF  ]  

Dynamic estimation of reflectivity by minimum-delay seismic trace decomposition
Milton J. Porsani, Bjørn Ursin, and Michelangelo G. Silva
Geophysics, 2013, Volume 78, no. 3, V109-V117
Abstract   Full Text:  [  PDF  ]  

Seismic velocity estimation.
Ursin, B.
Geophysical Prospecting, 1977, Volume 25, pp. 658-666.
Abstract   Full Text: [  PDF  ]  

Automatic nonhyperbolic velocity analysis
Brahim Abbad, Bjørn Ursin, and Didier Rappin
Geophysics, 2009, Volume 74, U1-U12
Abstract   Full Text:  [  PDF  ]  

Automatic nonhyperbolic velocity analysis, GEOPHYSICS, 74, no. 2, U1-U12.
Brahim Abbad, Bjørn Ursin, and Didier Rappin
Geophysics, 2010, Volume 75, no. 6, Y3-Y3
Abstract   Full Text:  [  PDF  ]  

High-resolution bootstrapped differential semblance
Brahin Abbad and Bjørn Ursin
Geophysics, 2012, Volume 77, no. 3, U39-U47
Abstract   Full Text:  [  PDF  ]  

Signal and traveltime parameter estimation using singular value decomposition
Bjørn Ursin, Michelângelo G. Silva, and Milton J. Porsani
Geophysics, 2014, Volume 79, no. 5, U1-U14
Abstract   Full Text:  [  PDF  ]  

Offset-dependent geometrical spreading in a layered medium
Bjørn Ursin
Geophysics, 1990, Volume 55, pp. 492-496
Abstract   Full Text: [  PDF  ]  

Out-of-plane geometrical spreading in anisotropic media
Norman Ettrich, Anders Sollid and Bjørn Ursin
Geophysical Prospecting, 2002, Volume 50,  Issue 4, pp. 383-392
Abstract   Full Text: [  PDF  ]  

Geometrical spreading in a layered transversely isotropic medium with vertical symmerty axis
Ursin B., and Hokstad K.
Geophysics, 2003, Volume 68,  Issue 6, pp. 2082-2091
Abstract   Full Text: [ PDF ]  

Improved geometric-spreading approximation in layered transversely isotropic media
Alexey Stovas and Bjørn Ursin
Geophysics, 2009, Volume 74, D85-D95
Abstract   Full Text:  [  PDF ]  

Time-to-depth migration using wavefront curvature.
Ursin, B.
Geophysical Prospecting, 1982, Volume 30, pp. 261-280.
Abstract   Full Text: [  PDF  ]  

Seismic migration using the WKB approximation.
Ursin, B.
The Geophys. J. of the Royal Astr. Soc. 1984, Volume 79, pp. 339-352.
Abstract   Full Text:  [  PDF  ]  

Migração de ondas planas em meios lateralmente heterogêneous.
Pestana, R., Chaves, R.D., and Ursin, B.
Revista Brasileira de Geofísica 1995, 13, 237-248.

True-amplitude frequency-wavenumber constant-offset migration
B. O. Ekren and Bjørn Ursin
Geophysics, 1999, Volume 64, pp. 915-924
Abstract   Full Text: [  PDF  ]  

Asymptotic error analysis of constant-velocity viscoacoustic migration
Emmanuel Causse and Bjørn Ursin
Geophysics, 1999, Volume 64, pp. 1036-1045
Abstract   Full Text: [  PDF  ]  

Viscoacoustic reverse-time migration.
Causse, E. and Ursin, B.
J. Seism. Expl., 9, 2000, 165-184.
Full Text:  [  PDF  ]

Focusing in dip and AVA compensation on scattering-angle/azimuth common image gathers
Sverre Brandsberg-Dahl, Maarten V. de Hoop and Bjørn Ursin
Geophysics, 2003, Volume 68,  Issue 1, pp. 232-254
Abstract   Full Text: [ PDF  ]  

Scattering-angle migration of ocean-bottom seismic data in weakly anisotropic media
Anders Sollid and Bjørn Ursin
Geophysics, 2003, Volume 68,  Issue 2, pp. 641-655
Abstract   Full Text: [  PDF ]  

Parameter inversion and angle migration in anisotropic elastic media
Bjørn Ursin
Geophysics, 2004, Volume 69,  Issue 5, pp. 1125-1142
Abstract   Full Text: [  PDF  ]  

2.5D modelling, inversion and angle migration in anisotropic elastic media
Stig-Kyrre Foss and Bjørn Ursin
Geophysical Prospecting, 2004, Volume 52,  Issue 1, pp. 65-84
Abstract   Full Text: [  PDF  ]  

Linearized 2.5-dimensional parameter imaging inversion in anisotropic elastic media
Stig-Kyrre Foss, Maarten V. de Hoop, Bjørn Ursin
Geophysical Journal International, 2005, Volume 161, Issue 3, pp. 722-738
Abstract   Full Text:  [  PDF  ]  

Seismic angle migration
Bjørn Ursin, Maarten V. de Hoop, Sverre Brandsberg-Dahl, and Anders Sollid
The Leading Edge, 2005, Volume 24, Issue 6, pp. 637-640
Abstract   Full Text:  [  PDF  ]  

Wide-angle phase-slowness approximations in VTI media
Ørjan Pedersen, Bjørn Ursin, and Alexey Stovas
Geophysics, 2007, Volume 72, S177-S185
Abstract   Full Text:  [  PDF  ]  

Zero-offset seismic amplitude decomposition and migration
Bjørn Ursin and Martin Tygel
Geophysics, 2007, Volume 72, S187-S193
Abstract   Full Text:  [  PDF  ]  

A new stabilized least-squares imaging condition
Flor A. Vivas, Reynam C. Pestana, and Bjørn Ursin
Journal of Geophysics and Engineering, 2009, Volume 6, 264-268
Abstract   Full Text:  [  PDF  ]  

Adaptive focusing window for seismic angle migration
Mathias Alerini and Bjørn Ursin
Geophysics, 2009, Volume 74, S1-S10
Abstract   Full Text:  [  PDF  ]  

Seismic imaging and illumination with internal multiples
Alison E. Malcolm, Bjørn Ursin, and Maarten V. de Hoop
Geophysical Journal International, 2009, Volume 176, 847-864
Abstract   Full Text:  [  PDF    HTML  ]  

Seismic imaging using lateral adaptive windows
Ørjan Pedersen, Sverre Brandsberg-Dahl, and Bjørn Ursin
Geophysics, 2010, Volume 75, S73-S79
Abstract   Full Text:  [  PDF  ]  

One-way wave-equation migration of compressional and converted waves in a VTI medium
Ørjan Pedersen, Bjørn Ursin, and Hans-K. Helgesen
Geophysics, 2010, Volume 75, no. 6, S237-S248
Abstract   Full Text:  [  PDF  ]  

Illumination analysis of wave-equation imaging with curvelets
Shen Wang, Maarten V. de Hoop, and Bjørn Ursin
Inverse Problems, 2010, Volume 26, 115013 (27 pp)
Abstract   Full Text:  [  PDF  ]  

Recursive imaging with multiply scattered waves using partial image regularization: A North Sea case study
Alison E. Malcolm , Maarten V. de Hoop , and Bjørn Ursin
Geophysics, 2011, Volume 76, no. 2, B33-B42
Abstract   Full Text:  [  PDF  ]  

Flux-normalized wavefield decomposition and migration of seismic data
Bjørn Ursin, Pedersen Ørjan, and Børge Arntsen.
Geophysics, 2012, Volume 77, no. 3, S83-S92
Abstract   Full Text:  [  PDF  ]  

Rapid expansion and pseudo spectral implementation for reverse time migration in VTI media
Reynam C. Pestana, Bjørn Ursin, and Paul L. Stoffa
Journal of Geophysics and Engineering, 2012, Volume 9, 291-301
Abstract   Full Text:  [  PDF  ]  

Estimation of geological dip and curvature from time-migrated zero-offset reflections in heterogeneous anisotropic media
Martin Tygel, Bjørn Ursin, Einar Iversen, and Maarten V. de Hoop
Geophysical Prospecting, 2012, Volume 60, no. 2, 201-216
Abstract   Full Text:  [  PDF  ]  

Estimation of geological dip and reflector curvature from zero-offset seismic reflections in heterogeneous anisotropic media
Martin Tygel, Bjørn Ursin, Einar Iversen, and Maarten V. de Hoop
Studia geophysica et geodaetica, 2012, Volume 56, Issue 2, 521-531
Abstract   Full Text:  [  PDF  ]  

Kinematic time migration and demigration of reflections in pre-stack seismic data
Iversen Einar, Martin Tygel, Bjørn Ursin, and Maarten V. de Hoop
Geophysical Journal International, 2012, Volume 189, no. 3, 1635-1666
Abstract   Full Text:  [  PDF  ]  

Shot-profile true amplitude crosscorrelation imaging condition
Børge Arntsen, Alexander Kritski, Bjørn Ursin, and Lasse Amundsen
Geophysics, 2013, Volume 78, no. 4, S221-S231
Abstract   Full Text:  [  PDF  ]  

Reconstruction of a conformally Euclidian metric from local boundary diffraction travel times
Maarten V. de Hoop, Sean F. Holman, Einar Iversen, Matti Lassas, and Bjørn Ursin
SIAM J. Math. Anal., 2014, 46, 3705-3726
Abstract   Full Text:  [  PDF  ]  

Inversion of reflection times in three dimensions
Håvar Gjøystdal and Bjørn Ursin
Geophysics, 1981, Volume 46, pp. 972-983
Abstract   Full Text: [  PDF  ]  

Error estimates for inverse modeling schemes using seismic traveltimes
Bjørn Ursin
Geophysics, 1981, Volume 46, pp. 1227-1234
Abstract   Full Text: [  PDF  ]  

Seismic velocity analysis in the scattering-angle/azimuth domain
S. Brandsberg-Dahl, B. Ursin, and M.V. de Hoop
Geophysical Prospecting, 2003, Volume 51,  Issue 4, pp. 295-314
Abstract   Full Text: [  PDF   Full text article  ]  

A practical approach to PP seismic angle tomography
Stig-Kyrre Foss, Bjørn Ursin, and Anders Sollid
Geophysical Prospecting, 2004, Volume 52,  Issue 6, pp. 663-669
Abstract   Full Text: [ PDF   Full text article  ]  

Depth-consistent reflection tomography using PP and PS seismic data
Stig-Kyrre Foss, Bjørn Ursin, and Maarten V. de Hoop
Geophysics, 2005, Volume 70, U51-U65
Abstract   Full Text:  [  PDF  ]  

Review of elastic and electromagnetic wave propagation in horizontally layered media
Bjørn Ursin
Geophysics, 1983, Volume 48, pp. 1063-1081
Abstract   Full Text: [  PDF  ]  

The plane-wave reflection and transmission response of a vertically inhomogeneous acoustic medium.
Ursin, B.
In Bernabini, M., Carrion, P., Jacovitti, G., Rocca, F., Treitel, S., and Worthington, M., eds.,
1987, Deconvolution and inversion. Blackwell Sc. Publ., Oxford, 1987, pp. 189-207.
Full Text:  [  PDF  ]

On: "When reflection coefficients are zero," by F. K. Levin (GEOPHYSICS, 51, 736–741, March 1986).
Bjørn Ursin
Geophysics, 1987, Volume 52, p. 372
Abstract   Full Text: [  PDF  ]  

The spectral function of a vertically inhomogeneous medium.
Ursin, B.
Geophysical Prospecting, 1988, Volume 36, pp. 1-5.
Abstract   Full Text: [  PDF  ]  

Wave series expansion for a stratified fluid
dos Santos, L.T., Ursin, B., and Tygel, M.
Russian Geology and Geophysics, 1996, 37, 9, pp. 23-45.

Reflectivity/transmissivity for one-dimensional inhomogeneous random elastic media: dynamic-equivalent-medium approach.
Shapiro, S.A., Hubral, P., and Ursin, B.
Geophysical Journal International, 1996, Volume 126, pp. 184-196.
Abstract   Full Text:  [  PDF  ]  

Weak-contrast approximation of the elastic scattering matrix in anisotropic media.
Haugen, G.U., and Ursin, B.
Pure and Applied Geophysics, 1996, Volume 148, pp. 685-714.
Abstract   Full Text:  [  PDF  ]  

Thin-bed AVO effects
N. E Bakke and B. Ursin
Geophysical Prospecting, 1998, Volume 46,  Issue 6, pp. 571-587
Abstract   Full Text: [  PDF   Full text article  ]  

Second-order approximations of the reflection and transmission coefficients between two visco-elastic isotropic media.
Stovas, A., and Ursin, B.
J. Seism. Expl., 9, 2001, 223-233.
Full Text:  [  PDF  ]

Reflection and transmission responses of a layered isotropic viscoelastic medium
Bjørn Ursin and Alexey Stovas
Geophysics, 2002, Volume 67, pp. 307-323
Abstract   Full Text: [  PDF ]  

Comparison of seismic dispersion and attenuation models.
Ursin, B., and Toverud, T.
Studia geophysica et geodaetica, 46, 2002, 293-320.
Abstract   Full Text: [  PDF  ]  

Comments on comparison of seismic dispersion and attenuation models by Ursin, B., and Toverud, T., Stud. Geophys, Geod. 46, 293-320.
Ursin, B., and Toverud, T.
Studia geophysica et geodaetica, 47, 2003, 217-219.
Abstract   Full Text: [  PDF  ]  

Reflection and transmission responses of layered transversely isotropic viscoelastic media
Alexey Stovas, Bjørn Ursin
Geophysical Prospecting, 2003, Volume 51,  Issue 5, pp. 447-477
Abstract   Full Text: [  PDF   Full text article  ]  

Equivalent time-average and effective medium for periodic layers
Alexey Stovas and Bjørn Ursin
Geophysical Prospecting, 2007, Volume 55, 871-882
Abstract   Full Text:  [  PDF  ]  

Computation of zero-offset vertical seismic profiles including geometrical spreading and absorption.
Ursin, B., and Arntsen, B.
Geophysical Prospecting 1985, Volume 33, pp. 72-96.
Abstract   Full Text:  [  PDF  ]  

New travel-time approximations for a transversely isotropic medium
Alexey Stovas and Bjørn Ursin
J. Geophys. Eng., 2004, Volume 1, pp. 128-133
Abstract   Full Text: [ PDF(86 kB) 

Generalized Dix equations for a layered transversely isotropic medium
Bjørn Ursin and Alexey Stovas
Geophysics, 2005, Volume 70, D77-D81
Abstract   Full Text:  [  PDF  ]  

Traveltime approximations for a layered transversely isotropic medium
Bjørn Ursin and Alexey Stovas
Geophysics, 2006, Volume 71, D23-D33
Abstract   Full Text:  [  PDF  ]  

Parameter estimation for a linear velocity function.
Alexey Stovas and Bjørn Ursin
Russian Geology and Geophysics, 2006, 47, 586-590

Discussion on "Divergent and asymptotic nature of the time-offset Taner-Koehler series in reflection seismics" (Santi Kumar Ghosh and Prakash Kumar, 2002, GEOPHYSICS, 67, 1913-1919)
Martin Tygel and Bjørn Ursin
Geophysics, 2006, Volume 71, X13-X14
Abstract   Full Text:  [  PDF  ]  

Convergence of traveltime power series for a layered VTI medium
Martin Tygel, Bjørn Ursin, and Alexey Stovas
Geophysics, 2007, Volume 72, D21-D28
Abstract   Full Text:  [  PDF  ]  

Sensitivity of Dix-type inverse formulae
Jon André Haugen, Bjørn Ursin, and Alexey Stovas
Journal of Geophysics and Engineering, 2007, Volume 4, 404-414
Abstract   Full Text:  [  PDF  ]  

Estimation of layer parameters for linear P- and S-wave velocity functions
Alexey Stovas and Bjørn Ursin
Geophysics, 2007, Volume 72, U27-U30
Abstract   Full Text:  [  PDF  ]  

Wavefront curvature in a layered medium
Bjørn Ursin
Geophysics, 1978, Volume 43, pp. 1011-1013
Abstract   Full Text: [  PDF  ]  

Reply by author to discussion by Peter Hubral
Bjørn Ursin
Geophysics, 1978, Volume 43, p. 1552
Abstract   Full Text: [  PDF  ]  

A new derivation of the wavefront curvature transformation at an interface between two inhomogeneous media.
Ursin, B.
Geophysical Prospecting, 1982, Volume 30, pp. 569-579.
Abstract   Full Text: [  PDF  ]  

Quadratic wavefront and traveltime approximations in inhomogeneous layered media with curved interfaces
Bjørn Ursin
Geophysics, 1982, Volume 47, pp. 1012-1021
Abstract   Full Text: [  PDF  ]  

Traveltime and wavefront curvature calculations in three-dimensional inhomogeneous layered media with curved interfaces
H. Gjøystdal, J. E. Reinhardsen, and B. Ursin
Geophysics, 1984, Volume 49, pp. 1466-1494
Abstract   Full Text: [  PDF  ]  

Zero-offset reflections from a curved interface
Bjørn Ursin
Geophysics, 1986, Volume 51, pp. 50-53
Abstract   Full Text: [  PDF  ]  

Seismic reflection amplitudes.
Ursin, B., and Dahl, T.
Geophysical Prospecting, 1992, Volume 40, pp. 483-512.
Abstract   Full Text: [  PDF  ]  

Reciprocal volume and surface scattering integrals for anisotropic elastic media
Bjørn Ursin and Martin Tygel
Wave motion, 1997, Volume 26, pp. 31-42
Abstract   Full Text: [  PDF  ]  

A unified Born-Kirchhoff representation for acoustic media.
Novais, A., Santos, L.T., Tygel, M., and Ursin, B.
J. Seismic Exploration, 1997, Volume 6, pp. 217-226
Full Text:  [  PDF  ]

Weak-contrast edge and vertex diffractions in anisotropic elastic media
Martin Tygel and Bjørn Ursin
Wave motion, 1999, Volume 29, pp. 363-373
SummaryPlus | Full Text + Links | PDF

The Kirchhoff-Helmholtz integral for anisotropic elastic media
Jörg Schleicher, Martin Tygel, Bjørn Ursin and Norman Bleistein
Wave motion, Volume 34, 2001, 353-364
SummaryPlus | Full Text + Links | PDF

3D diffraction modeling of singly scattered acoustic wavefields based on the combination of surface integral propagators and transmission operators
Milana A. Ayzenberg, Arkady M. Aizenberg, Hans B. Helle, Kamill D. Klem-Musatov, Jan Pajchel, and Bjørn Ursin
Geophysics, 2007, Volume 72, SM19-SM34
Abstract   Full Text:  [  PDF  ]  

Effective reflection coefficients for curved interfaces in transversely isotropic media
Milana Ayzenberg, Ilya Tsvankin, Arkady Aizenberg, and Bjørn Ursin
Geophysics, 2009, Volume 74, WB33-WB53
Abstract   Full Text:  [  PDF  ]  

Tip-wave superposition method with effective reflection and transmission coefficients: A new 3D Kirchhoff-based approach to synthetic seismic modeling
Milana Ayzenberg, Arkady M. Aizenberg, and Bjørn Ursin
The Leading Edge, 2009, Volume 28, 582-588
Abstract   Full Text:  [  PDF  ]  

SS-traveltime parameters from PP and PS reflections
Bjørn Ursin, Martin Tygel, and Einar Iversen
Geophysics, 2009, Volume 74, R35-R47
Abstract   Full Text:  [  PDF  ]  

Laboratory benchmarks vs. Synthetic modeling of seismic wave propagation in complex environments (BENCHIE Project): Results for a spectral-element method and the Tip Wave Superposition Method
Paul Cristini, Nathalie Favretto-Cristini, Anastasia Tantsereva, Bjørn Ursin, Arkady Aizenberg, and Dimitri Komatitsch
Proceedings in Meetings on Acoustics, 2012, Volume 17, 070024
Abstract   Full Text:  [  PDF  ]  

Numerical modeling of zero-offset laboratory data in a strong topographic environment: Results for a spectral-element method and a discretized Kirchhoff integral method
Nathalie Favretto-Cristini, Anastasiya Tantsereva, Paul Cristini, Bjørn Ursin, Dimitri Komatitsch, and Arkady M. Aizenberg
Earthquake Science, 2014, Volume 27, Issue 4, pp 391-399
Abstract   Full Text:  [  PDF  ]  

Fresnel volume and interface Fresnel zone for reflected and transmitted waves from a curved interface in anisotropic media
Bjørn Ursin, Nathalie Favretto-Cristini, and Paul Cristini
Geophysics, 2014, Volume 79, no. 5, C123-C134
Abstract   Full Text:  [  PDF  ]  

Numerical modeling of 3D zero-offset laboratory data by a discretized Kirchhoff integral method
Anastasiya Tantsereva, Bjørn Ursin, Nathalie Favretto-Cristini, Paul Cristini, and Arkady M. Aizenberg
Geophysics, 2014, Volume 79, no. 2, T77-T90
Abstract   Full Text:  [  PDF  ]  

Approximate computation of the acoustic impedance from seismic data
K. A. Berteussen and B. Ursin
Geophysics, 1983, Volume 48, pp. 1351-1358
Abstract   Full Text: [  PDF  ]  

Comparison of some inverse methods for wave propagation in layered media.
Ursin, B., and Berteussen, K.A.
The Proceedings of the IEEE 74, 1986, pp. 389-400.
Abstract   Full Text: [  PDF  ]  

Complete inversion of zero-offset seismic data.
Ursin, B.
Geophysical Prospecting, 1986, Volume 34, pp. 1213-1218.
Abstract   Full Text: [  PDF  ]  

Detection of zero-offset seismic reflections.
Landrø, M., and Ursin, B.
First Break 6, 1988, pp. 385-394.
Abstract   Full Text: [  PDF  ]  

Geophysical data inversion - methods and applications.
Ofoegbu, C., Vogel, A., Ursin, B., and Gorenflo, R., (eds.)
Fried. Vieweg & Sohn, Wiesbaden, 1990

Parameter estimation in a one-dimensional anelastic medium.
Dahl. T., and Ursin, B.
J. of Geophys. Res. 1991, 96, B12, pp. 20217-20233.
Abstract   Full Text: [  PDF  ]  

Frequency-wavenumber inversion of acoustic data
L. Amundsen and B. Ursin
Geophysics, 1991, Volume 56, pp. 1027-1039
Abstract   Full Text: [  PDF  ]  

Non-linear AVO inversion for a stack of anelastic layers.
Dahl, T., and Ursin, B.
Geophysical Prospecting, 1992, Volume 40, pp. 243-265.
Abstract   Full Text: [  PDF  ]  

The accuracy of linearized elastic parameter estimation.
Ursin, B., and Tjåland, E.
J. of Seismic Exploration 1993, Volume 2, pp. 349-363.
Full Text:  [  PDF  ]

Estimation of reflection coefficients from zero-offset field data
Børge Arntsen and Bjørn Ursin
Geophysics, 1993, Volume 58, pp. 1634-1645
Abstract   Full Text: [  PDF  ]  

Frequency-wavenumber elastic inversion of marine seismic data
Huasheng Zhao, Bjørn Ursin, and Lasse Amundsen
Geophysics, 1994, Volume 59, pp. 1868-1881
Abstract   Full Text: [  PDF  ]  

Robust AVO analysis
Bjørn Ursin and Bjørn Olav Ekren
Geophysics, 1995, Volume 60, pp. 317-326
Abstract   Full Text: [  PDF  ]  

The information content of the elastic reflection matrix.
Ursin, B. and Tjåland, E.
Geophysical Journal International, 1996, Volume 125, pp. 214-228.
Abstract   Full Text:  [  PDF  ]  

Linearized elastic parameter sections.
Ursin, B., Ekren, B.O., and Tjåland, E.
Geophysical Prospecting, 1996, Volume 44, pp. 427-455.
Abstract   Full Text:  [  PDF  ]  

Preconditioning of full-waveform inversion in viscoacoustic media
Emmanuel Causse, Rune Mittet, and Bjørn Ursin
Geophysics, 1999, Volume 64, pp. 130-145
Abstract   Full Text: [  PDF  ]  

Prediction of reservoir variables based on seismic data and well observations.
Eide, A.L., Omre, H., and Ursin, B.
Journal of the American Statistical Association, 97, 2002, 18-28.
Abstract   Full Text: [  PDF  ]  

Combined seismic inversion and gravity modeling of a shallow anomaly in the southern Barents Sea
Bjørn Ursin, Christian Bauer, Huasheng Zhao, and Christine Fichler
Geophysics, 2003, Volume 68,  Issue 4, pp. 1140-1149
Abstract   Full Text: [  PDF ]  

Comparison of seismic attenuation models using zero-offset vertical seismic profiling (VSP) data
Tommy Toverud and Bjørn Ursin
Geophysics, 2005, Volume 70, Issue 2, pp. F17-F25
Abstract   Full Text:  [  PDF  ]  

Acoustic nonlinear amplitude versus angle inversion and data-driven depth imaging in stratified media derived from inverse scattering approximations
Lasse Amundsen, Arne Reitan, Børge Arntsen, and Bjørn Ursin
Inverse Problems, 2006, Volume 22, 1921-1945
Abstract   Full Text:  [  PDF  ]  

Elastic nonlinear amplitude versus angle inversion and data-driven depth imaging in stratified media derived from inverse scattering approximations.
Lasse Amundsen, Arne Reitan, Børge Arntsen and Bjørn Ursin.
Inverse Problems, 2008, 24, 23 pp.
Abstract   Full Text:  [  PDF  ]  

Nonlinear Bayesian joint inversion of seismic reflection coefficients.
Tor E. Rabben, Håkon Tjelmeland and Bjørn Ursin.
Geophysical Journal International, 2008, 173, 265-280
Abstract   Full Text:  [  PDF    HTML  ]  

AVA inversion of the top Utsira Sand reflection at the Sleipner field
Tor E. Rabben, and Bjørn Ursin
Geophysics, 2011, Volume 76, no. 3, C53-C63
Abstract   Full Text:  [  PDF  ]  

Three-dimensional non-stationary and non-linear isotropic AVA inversion
Erlend Aune, Jo Eidsvik, and Bjørn Ursin
Geophysical Journal International, 2013, Volume 194, no. 2, 787-803
Abstract   Full Text:  [  PDF  ]  

Full waveform inversion in the frequency domain using direct iterative T-matrix methods
Morten Jakobsen and Bjørn Ursin
J. Geophys. Eng, 2015, 12, 400-418
Abstract   Full Text:  [  PDF  ]  

Low-frequency electromagnetic fields in applied geophysics: Waves or diffusion?
Lars O. Løseth, Hans M. Pedersen, Bjørn Ursin, Lasse Amundsen, and Svein Ellingsrud
Geophysics, 2006, Volume 71, W29-W40
Abstract   Full Text:  [  PDF  ]  

Decomposition of electromagnetic fields into upgoing and downgoing components
Lasse Amundsen, Lars Løseth, Rune Mittet, Svein Ellingsrud, and Bjørn Ursin
Geophysics, 2006, Volume 71, G211-G223
Abstract   Full Text:  [  PDF  ]  

Electromagnetic fields in planarly layered anisotropic media
Lars O. Løseth and Bjørn Ursin
Geophysical Journal International, 2007, Volume 170, Issue 1, 44-80
Abstract   Full Text:  [  PDF  ]  

TIV contrast source inversion of mCSEM data
Torgeir Wiik, Lars O. Løseth , Bjørn Ursin, and Ketil Hokstad
Geophysics, 2011, Volume 76, no. 1, F65-F76
Abstract   Full Text:  [  PDF  ]  

2.5D EM modelling in TIV conductive media and the effect of anisotropy in normalized amplitude responses
Torgeir Wiik, Bjørn Ursin, and Ketil Hokstad
Journal of Geophysics and Engineering, 2013, Volume 10, 015006
Abstract   Full Text:  [  PDF  ]  

Joint contrast source inversion of marine magnetotelluric and controlled-source electromagnetic data
Torgeir Wiik, Ketil Hokstad , Bjørn Ursin, and Lutz Mütschard
Geophysics, 2013, Volume 78, no. 6, E315-E327
Abstract   Full Text:  [  PDF  ]  

Estimation of seafloor electromagnetic receiver orientation
Lutz Mütschard, Ketil Hokstad , and Bjørn Ursin
Geophysics, 2014, Volume 79, no. 2, E81-E89
Abstract   Full Text:  [  PDF  ]  

Elastic properties of rocks with fracture-induced anisotropy.
Haugen, G.U., and Ursin, B.
In Fjær, E., Holt, R.M., and Rathore, J.S., eds., 1996, Seismic anisotropy. SEG, Tulsa, 1996, pp. 357-383.

Porosity and permeability prediction from wireline logs using artificial neural networks: a North Sea case study
Hans B. Helle, Alpana Bhatt and Bjørn Ursin
Geophysical Prospecting, 2001, Volume 49,  Issue 4, pp. 431-444
Abstract   Full Text: [ PDF   Full text article  ]  

Wave velocities and attenuation of shaley sandstones as a function of pore pressure and partial saturation
Nam H. Pham, José M. Carcione, Hans B. Helle and Bjørn Ursin
Geophysical Prospecting, 2002, Volume 50,  Issue 6, pp. 615-627
Abstract   Full Text: [  PDF   Full text article  ]  

Cross-property relations between electrical conductivity and the seismic velocity of rocks
José M. Carcione, Bjørn Ursin, and Janniche I. Nordskag
Geophysics, 2007, Volume 72, E193-E204
Abstract   Full Text:  [  PDF  ]  

Approximate lumped models of a tubular chemical reactor, and their use in feedback and feedforward control.
Fjeld, M. and Ursin, B.
Paper 5.1.3 in H. Schwarz (ed), 1971, Multivariable technical control systems. Proceedings of the 2nd IFAC Symposium, Dusseldorf, October 11-13, 1971, North-Holland Publishing Company, Amsterdam, 1971.

Asymptotic convergence properties of the extended Kalman filter using filtered state estimates.
Ursin, B.
IEEE Trans. Automatic Control AC - 25, 1980, pp. 1207-1211.
Abstract   Full Text: [  PDF  ]  

Frequency attenuation and resolution of seismic data receive the full treatment at research workshop
Christian Deplante and Bjørn Ursin
First Break, Volume 27, no. 11, 9-12
Full Text:  [  HTML  ]  

ROSE – Rock physics and seismic research at the Norwegian University of Science and Technology
Martin Landrø, Rune M. Holt, and Bjørn Ursin
Exploration & Production: Oil and Gas Review, 2009, Volume 7, no. 2, 48-50
Full Text:  [  HTML  ]