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, Volume 7, 284-289
Abstract   Full Text:  [  PDF  ]  

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

PP/PS anisotropic stereotomography
Steinar Nag, Mathias Alerini, and Bjørn Ursin
Geophysical Journal International, Volume 181, 427-452
Abstract   Full Text:  [  PDF    HTML  ]  

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

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, Volume 7, 51-63
Abstract   Full Text:  [  PDF  ]  

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, Volume 7, no. 2, 48-50
Full Text:  [  HTML  ]  

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

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

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

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

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

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, Volume 28, 582-588
Abstract   Full Text:  [  PDF    HTML  ]  

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

A new stabilized least-squares imaging condition
Flor A. Vivas, Reynam C. Pestana, and Bjørn Ursin
Journal of Geophysics and Engineering, Volume 6, 264-268
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  ]  

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

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, 24, 23 pp.
Abstract   Full Text:  [  PDF  ]  

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

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

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

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

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

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

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, Volume 72, SM19-SM34
Abstract   Full Text:  [  PDF    GZipped PS  ]  

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  ]  

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  ]  

Sensitivity of Dix-type inverse formulae
Jon André Haugen, Bjørn Ursin, and Alexey Stovas
Journal of Geophysics and Engineering, 2007, Volume 4, 871-882
Abstract   Full Text:  [  PDF  ]  

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, Volume 71, X13-X14
Abstract   Full Text:  [  PDF    GZipped PS  ]  

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, Volume 22, 1921-1945
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, Volume 71, G211-G223
Abstract   Full Text:  [  PDF    GZipped PS  ]  

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

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

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

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

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

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

Seismic angle tomography
Bjørn Ursin, Maarten V. de Hoop, Stig-Kyrre Foss, and Sverre Brandsberg-Dahl
The Leading Edge, 2005, Volume 24, Issue 6, pp. 628-634
Abstract   Full Text:  [  PDF    GZipped PS  ]  

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    GZipped PS  ]  

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 (305 kB)  ]  

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 (1364 kB)    GZipped PS  ]  

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 (229 kB)   Full text article  ]  

Parameter inversion and angle migration in anisotropic elastic media
Bjørn Ursin
Geophysics, 2004, Volume 69,  Issue 5, pp. 1125-1142
Abstract   Full Text: [  PDF (271 kB)   GZipped PS  ]  

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 (234 kB)   ]  

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) 

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 (138 kB)   GZipped PS  ]   Order top   bottom

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 (2144 kB)   GZipped PS  ]   Order top   bottom

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 (1033 kB)   GZipped PS  ]   Order top    bottom

Combined seismic inversion and gravity modeling of a shallow anomaly in the southern Barents Sea
Bjørn Ursin, Christian Bauer and Huasheng Zhao
Geophysics, 2003, Volume 68,  Issue 4, pp. 1140-1149
Abstract   Full Text: [  PDF (460 kB)   GZipped PS  ]   Order top    bottom

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 (1052 kB)   HTML  ]  

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 (531 kB)   Full text article  ]  

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  ]  

2002

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 (433 kB)   GZipped PS  ]   Order top    bottom

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 (666 kB)   Full text article  ]  

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    Full text article  ]  

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.

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

2001

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 (1280 kB)   Full text article  ]  

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 (141 K)

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

Second-order approximations of the reflection and transmission coefficients between two visco-elastic isotropic media.
Stovas, A., and Ursin, B.
J. Seism. Expl., 10, 2001, 223-233.
Full Text:  [  PDF  ]


2000

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 (1900 kB)   GZipped PS  ]   Order top    bottom

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 (1234 kB)   Full text article  ]  

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


1999

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 (7324 kB)   GZipped PS  ]   Order top   bottom

Asymptotic error analysis of constant-velocity viscoacoustic migration
Emmanuel Causse and Bjørn Ursin
Geophysics, 1999, Volume 64, pp. 1036-1045
Abstract   Full Text: [  PDF (368 kB)   GZipped PS  ]   Order top   bottom

True-amplitude frequency-wavenumber constant-offset migration
B. O. Ekren and Bjørn Ursin
Geophysics, 1999, Volume 64, pp. 915-924
Abstract   Full Text: [  PDF (1906 kB)   GZipped PS  ]   Order top    bottom

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 (559 kB)   GZipped PS  ]   Order top    bottom

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 (106 K)


1998

Mixed-phase deconvolution
Milton J. Porsani and Bjørn Ursin
Geophysics, 1998, Volume 63, pp. 637-647
Abstract   Full Text: [  PDF (1138 kB)   GZipped PS  ]   Order top    bottom

Thin-bed AVO effects
N. E Bakke and B. Ursin
Geophysical Prospecting, 1998, Volume 46,  Issue 6, pp. 571-507
Abstract   Full Text: [  PDF (1829 kB)   Full text article  ]  


1997

Methods for estimating the seismic reflection response
Bjørn Ursin
Geophysics, 1997, Volume 62, pp. 1990-1995
Abstract   Full Text: [  PDF (54 kB)   GZipped PS  ]   Order top    bottom

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 (551 kB)    ]   top    bottom

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  ]


1996

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

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.

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.

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.

Linearized elastic parameter sections.
Ursin, B., Ekren, B.O., and Tjåland, E.
Geophysical Prospecting, 1996, Volume 44, pp. 427-456.

The information content of the elastic reflection matrix.
Ursin, B. and Tjåland, E.
Geophysical Journal International, 1996, Volume 125, pp. 214-228.

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  ]


1995

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

Robust AVO analysis
Bjørn Ursin and Bjørn Olav Ekren
Geophysics, 1995, Volume 60, pp. 317-326
Abstract   Full Text: [  PDF (1511 kB)   GZipped PS  ]   Order top   bottom

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(633 kB)   GZipped PS  ]   Order top   bottom

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(536 kB)   GZipped PS  ]   Order top   bottom

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  ]


1992

Seismic reflection amplitudes.
Ursin, B., and Dahl, T.
Geophysical Prospecting, 1992, Volume 40, pp. 483-512.

Non-linear AVO inversion for a stack of anelastic layers.
Dahl, T., and Ursin, B.
Geophysical Prospecting, 1992, Volume 40, pp. 243-265.


1991

Parameter estimation in a one-dimensional anelastic medium.
Dahl. T., and Ursin, B.
J. of Geophys. Res. 1991, 96, B12, pp. 20217-20233.

Frequency-wavenumber inversion of acoustic data
L. Amundsen and B. Ursin
Geophysics, 1991, Volume 56, pp. 1027-1039
Abstract   Full Text: [  PDF(949 kB)   GZipped PS  ]   Order top   bottom


1990

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

Offset-dependent geometrical spreading in a layered medium
Bjørn Ursin
Geophysics, 1990, Volume 55, pp. 492-496
Abstract   Full Text: [  PDF(286 kB)   GZipped PS  ]   Order top   bottom


1988

Detection of zero-offset seismic reflections.
Landrø, M., and Ursin, B.
First Break 6, 1988, pp. 385-394.

The spectral function of a vertically inhomogeneous medium.
Ursin, B.
Geophysical Prospecting, 1988, Volume 36, pp. 1-5.


1987

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(60 kB)   GZipped PS  ]   Order top   bottom

Computation of signatures of linear airgun arrays.
Vaage, S., and Ursin, B.
Geophysical Prospecting 1987, Volume 35, pp. 281-287.

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  ]


1986

Complete inversion of zero-offset seismic data.
Ursin, B.
Geophysical Prospecting, 1986, Volume 34, pp. 1213-1218.

Zero-offset reflections from a curved interface
Bjørn Ursin
Geophysics, 1986, Volume 51, pp. 50-53
Abstract   Full Text: [  PDF(235 kB)   GZipped PS  ]   Order top   bottom

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.


1985

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.)

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, 57-74.)

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.


1984

Seismic migration using the WKB approximation.
Ursin, B.
The Geophys. J. of the Royal Astr. Soc. 1984, Volume 79, pp. 339-352.

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(1696 kB)   GZipped PS  ]   Order top   bottom

Reply to Further comment on "Interaction between airguns".
Vaage, S., Ursin, B., and Haugland, K.
Geophysical Prospecting, 1986, Volume 34, pp. 942-945.

Reply to Comment on "Interaction between airguns".
Vaage, S., Ursin, B., and Haugland, K.
Geophysical Prospecting, 1985, Volume 33, pp. 1067.

Interaction between airguns.
Vaage, S., Ursin, B., and Haugland, K.
Geophysical Prospecting, 1984, Volume 32, pp. 676-689.


1983

Spatial filtering of marine seismic data
Bjørn Ursin
Geophysics, 1983, Volume 48, pp. 1611-1630
Abstract   Full Text: [  PDF (2058 kB)   GZipped PS  ]   Order top   bottom

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 (569 kB)   GZipped PS  ]   Order top   bottom

Review of elastic and electromagnetic wave propagation in horizontally layered media
Bjørn Ursin
Geophysics, 1983, Volume 48, pp. 1063-1081
Abstract   Full Text: [  PDF (1310 kB)   GZipped PS  ]   Order top   bottom

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.

Time-to-depth migration using wavefront curvature.
Ursin, B.
Geophysical Prospecting, 1982, Volume 30, pp. 261-280.

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 (617 kB)   GZipped PS  ]   Order top   bottom

Error estimates for inverse modeling schemes using seismic traveltimes
Bjørn Ursin
Geophysics, 1981, Volume 46, pp. 1227-1234
Abstract   Full Text: [  PDF (663 kB)   GZipped PS  ]   Order top   bottom

Inversion of reflection times in three dimensions
Håvar Gjøystdal and Bjørn Ursin
Geophysics, 1981, Volume 46, pp. 972-983
Abstract   Full Text: [  PDF (779 kB)   GZipped PS  ]   Order top   bottom

Asymptotic convergence properties of the extended Kalman filter using filtered state estimates.
Ursin, B.
IEEE Trans. Automatic Control AC - 25, 1980, pp. 1207-1211.


1979

Adaptive long-period multiple attenuation.
Brandsæter, H., and Ursin, B.
Geophysical Prospecting, 1979, Volume 27, pp. 709-725.

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 (1410 kB)   GZipped PS  ]   Order top   bottom

Seismic signal detection and parameter estimation.
Ursin, B.
Geophysical Prospecting, 1979, Volume 27, pp. 1-15.


1978

Attenuation of coherent noise on marine seismic exploration using very long arrays.
Ursin, B.
Geophysical Prospecting, 1978, Volume 26, pp. 722-749.

Reply by author to discussion by Peter Hubral
Bjørn Ursin
Geophysics, 1978, Volume 43, p. 1552
Abstract   Full Text: [  PDF (82 kB)   GZipped PS  ]   Order top   bottom

Wavefront curvature in a layered medium
Bjørn Ursin
Geophysics, 1978, Volume 43, pp. 1011-1013
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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.

Seismic velocity estimation.
Ursin, B.
Geophysical Prospecting, 1977, Volume 25, pp. 658-666.


1971

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.