Overview

Welcome to SWAG at KAUST, a group made up of students and researchers (see People) dedicated to Seismic Wave Analysis research and development with funding primarily from KAUST, as well external sources. We hope this page will be a vehicle to make our work visible and available online to the scientific community at large as well as our sponsors. To learn more about SWAG vision, mission, and scope, please access the following link. Also feel free to explore info on research done at SWAG. KAUST is thriving to be a hub for ideas and innovations and we plan to contribute to this effort in the seismic wave analysis arena.


​​Visit thold SWAG website by clicking here​.
  • Zedong Wu and Tariq Alkhalifah, "The optimized gradient method for full waveform inversion and its spectral implementation", Geophysics Journal International 205 (2016): 1823-1831. doi: 10.1093/gji/ggw112.​
  • BibTeX​ 
Keywords:
Numerical solutions, Fourier analysis, Inverse theory, Tomography, Wave propagation
  • Shibo Xu, Alexey Stovas and Tariq Alkhalifah, "Estimation of the anisotropy parameters from imaging moveout of diving wave in a factorized VTI medium", Geophysics (2016):submitted.​​
Keywords:
anisotropy, moveout, VTI
  • Qi Hao and Tariq Alkhalifah, "An acoustic eikonal equation for attenuating VTI media", Geophysics (2016), submitted.​​​
Keywords:
eikonal, VTI
  • Nabil Masmoudi and Tariq Alkhalifah, "Traveltime approximations and parameter estimation for orthorhombic media", Geophysics (2016):accepted.​
Keywords:
orthorhombic, parameter, estimation
  • Jiubing Cheng, Zedong Wu and Tariq Alkhalifah, "Simulating propagation of decoupled elastic waves using low-rank approximate mixed-domain integral operators for anisotropic media", Geophysics 81 (2016): T63-T77 doi: 10.1190/geo2015-0184.1.
  • BibTex​ 
Keywords:
anisotropy, elastic, decomposition, wave propagation, polarization
  • Tariq Alkhalifah, "Full-model wavenumber inversion: An emphasis on the appropriate wavenumber continuation", Geophysics 81 (2015): R89-R98. doi: 10.1190/geo2015-0537.1.
  • ​Bib​Tex​
Keywords:
full-waveform inversion, wave equation, velocity analysis
  • Juwon Oh and Tariq Alkhalifah, "The scattering potential of partial derivative wavefields in 3D elastic orthorhombic media: An inversion prospective", GJI (2015):online. DOI: 10.1093/gji/ggw238.
  • BibTex​ 
Keywords:
3D elastic waveform inversion, Multi-parameter, Radiation pattern, Orthorhombic anisotropy, Parameterisation
  • Mahesh Kalita and Tariq Alkhalifah, "Common-image gathers using the excitation imaging condition", Geophysics (2016):accepted.​
Keywords:
excitation, imaging
  • Nabil Masmoudi and Tariq Alkhalifah, "A new parametrization for waveform inversion in acoustic orthorhombic media", Geophysics (2016):accepted.​​​
Keywords:
waveform, inversion, acoustic
  • Tariq Alkhalifah, "Insights into the data dependency on anisotropy: an inversion prospective", Geophysical Prospecting (2015):accepted.
Keywords:
anisotropy, data dependency
  • Qi Hao, Alexey Stovas and Tariq Alkhalifah, "The offset-midpoint traveltime pyramid of P-waves in homogeneous orthorhombic media", Geophysics (2015):submitted.​
Keywords:
traveltime, homogeneous, orthorhombic
  • Vladimir Li, Ilya Tsvankin and Tariq Alkhalifah, "Analysis of RTM extended images for VTI media", Geophysics (2015):submitted.​
Keywords:
RTM, VTI
  • Tariq Alkhalifah and Zedong Wu, "Multi-scattering inversion for low model wavenumbers", Geophysics (2015):submitted.
Keywords:
multi-scattering, inversion
  • Juwon Oh and Tariq Alkhalifah, "Elastic Orthorhombic anisotropic parameter inversion: An analysis of parameterization", Geophysics (2015):submitted.​
Keywords:
elastic, orthorhombic, anisotropy
  • Umair bin Waheed and Tariq Alkhalifah, "Fast sweeping methods for the factored TTI eikonal equation", Journal of Scientific Computing (2015):submitted.​
Keywords:
TTI, eikonal
  • Zhendong Zhang and Tariq Alkhalifah, "Full waveform inversion using oriented time-domain imaging method for VTI medium", Geophysical prospecting (2016):submitted.​​
Keywords:
FWI, time-domain imaging, VTI
  • Ramzi Djebbi, René-Edouard Plessix and Tariq Alkhalifah, "Analysis of the traveltime sensitivity kernels for an acoustic transversely isotropic medium with a vertical axis of symmetry", Geophysical Prospecting (2015): accepted.​​
Keywords:
Anisotropy, Tomography, Inversion
  • Umair bin Waheed and Tariq Alkhalifah, "Effective ellipsoidal models for wavefield extrapolation in tilted orthorhombic media", Special issue of Studia (2015):submitted.​
Keywords:
effective model, tilted orthorhombic media
  • Tariq Alkhalifah and Zedong Wu, "Migration velocity analysis using prestack wavefields", Geophysical Prospecting (2015):submitted.​
Keywords:
migration, prestack, velocity analysis
  • Tariq Alkhalifah, "Insights into the data dependency on anisotropy: an inversion prospective", Geophysical Prospecting (2015):submitted.
Keywords:
anisotropy, data dependency
  • Umair bin Waheed and Tariq Alkhalifah, "Anisotropy parameter inversion in VTI media using diffractions", Geophysical Prospecting (2015):submitted.​
Keywords:
anisotropy, VTI, diffraction
  • Yunseok Choi and Tariq Alkhalifah, "Unwrapped phase inversion with an exponential damping",  Geophysics 80 (2015): R251-R264. doi: 10.1190/geo2014-0498.1.​​​
  • BibTe​x​ 
Keywords:
inversion, phase, frequency-domain
  • Tariq Alkhalifah, "Conditioning the full-waveform inversion gradient to welcome anisotropy", Geophysics 80 (2015): R111-R122. doi: 10.1190/geo2014-0390.1.
  • BibTe​x​ 
Keywords:
inversion, anisotropy, acoustic
  • Zedong Wu and Tariq Alkhalifah, "Simultaneous inversion of the background velocity and the perturbation in full-waveform inversion", Geophysics 80 (2015): R417-R329. doi: 10.1190/geo2014-0365.1.
  • BibTe​x​ 
Keywords:
acoustic, least squares, reflection, inversion, velocity analysis
  • Tariq Alkhalifah and Zedong Wu, "The natural combination of full and image-based waveform inversion", Geophysical Prospecting (2015): online. DOI: 10.1111/1365-2478.12264.
  • BibT​ex​ 
Keywords:
FWI, MVA
  • Umair bin Waheed and Tariq Alkhalifah, "An efficient wave extrapolation method for anisotropic media with tilt", Geophysical Prospecting 63 (2015): 1126-1141. DOI: 10.1111/1365-2478.12233.
  • BibTe​x​ 
Keywords:
Anisotropy, Modelling, Wave
  • Tariq Alkhalifah, "Scattering-angle based filtering of the waveform inversion gradients", Geophysical Journal International 200 (2015): 363-373. doi: 10.1093/gji/ggu379.
  • BibT​ex​ 
Keywords:
Inverse theory, Seismic tomography, Acoustic properties
  • Umair bin Waheed, Tariq Alkhalifah and Hui Wang, "Efficient traveltime solutions of the acoustic TI eikonal equation", Journal Of Computational Physics 282 (2015): 62-76. doi:10.1016/j.jcp.2014.11.006.
  • BibTe​x​ 
Keywords:
Eikonal equation, Tilted transverse isotropy, Anisotropy, Fast sweeping method, Efficient traveltime solutions
  • Qi Hao, Alexey Stovas and Tariq Alkhalifah, "The offset-midpoint traveltime pyramid in 3D transversely isotropic media with a horizontal symmetry axis", Geophysics 80 (2015): T51-T62. doi: 10.1190/geo2013-0322.1.
  • BibT​ex​ 
Keywords:
anisotropy, traveltime, modeling, prestack, migration
  • Paul Sava and Tariq Alkhalifah, "Anisotropy signature in reverse-time migration extended images", Geophysical Prospecting 63 (2015): 271-282. DOI: 10.1111/1365-2478.12189.
  • BibTe​x​ 
Keywords:
Anisotropy signature, reverse-time migration
  • Tariq Alkhalifah, Sergey Fomel and Zedong Wu, "Source–receiver two-way wave extrapolation for prestack exploding-reflector modelling and migration", Geophysical Prospecting 63 (2015): 23-34. DOI: 10.1111/1365-2478.12162.
  • BibT​ex​ 
Keywords:
Source-receiver, two-way wave extrapolation, prestack exploding-reflector
  • Tariq Alkhalifah, "Prestack exploding reflector modelling and migration for anisotropic media", Geophysical Prospecting 63 (2015): 2-10. DOI: 10.1111/1365-2478.12148.
  • BibT​ex​ 
Keywords:
Anisotropic, Prestack, Migration
  • M. A. H. Zuberi and Tariq Alkhalifah, "Generalized internal multiple imaging", Geophysics 79 (2014): S207-S216. doi: 10.1190/geo2013-0287.1.
  • BibTex​ 
Keywords:
imaging, multiples, scattering, Reverse time migration
  • Alexey Stovas and Tariq Alkhalifah, "Analytical approximations of diving-wave imaging in constant-gradient medium", Geophysics 79 (2014): S131-S140. doi: 10.1190/geo2013-0386.1.
  • BibT​ex​ 
Keywords:
diving wave, imaging
  • Tariq Alkhalifah and Rene-Edouard Plessix, "A recipe for practical full-waveform inversion in anisotropic media: An analytical parameter resolution study", Geophysics 79 (2014): R91-R101. doi: 10.1190/geo2013-0366.1.
  • BibTe​x​ 
Keywords:
inversion, anisotropy, scattering, RTM
  • M. A. H. Zuberi and Tariq Alkhalifah, "Generalized internal multiple imaging (GIMI) using Feynman-like diagrams", Geophysical Journal International 197 (2014): 1582-1592.
  • Bib​Tex​ 
Keywords:
Interferometry, Body waves, Wave scattering and diffraction
  • Ali Aldawood, Ibrahim Hoteit and Tariq Alkhalifah, "The possibilities of compressed-sensing-based Kirchhoff prestack migration", Geophysics 79 (2014): S113-S120. doi: 10.1190/geo2013-0271.1.
  • BibT​ex​ 
Keywords:
imaging, sparse, inversion, least squares, migration
  • Tariq Alkhalifah and Yunseok Choi, "From tomography to full-waveform inversion with a single objective function", Geophysics 79 (2014): R55-R61. doi: 10.1190/geo2013-0291.1.
  • BibT​ex​ 
Keywords:
inversion, tomography, velocity analysis
  • Ramzi Djebbi and Tariq Alkhalifah, "Traveltime sensitivity kernels for wave equation tomography using the unwrapped phase", Geophysical Journal International 197 (2014): 975-986. doi: 10.1093/gji/ggu025.
  • BibTe​x​ 
Keywords:
Inverse theory, Seismic tomography, Wave propagation
  • Wilson Ibanez-Jacome, Tariq Alkhalifah and Umair bin Waheed, "Effective orthorhombic anisotropic models for wavefield extrapolation", Geophysical Journal International 198 (2014): 1653-1661. doi: 10.1093/gji/ggu229.
  • BibT​ex​ 
Keywords:
Numerical solutions, Non-linear differential equations, Seismic anisotropy, Wave propagation, Acoustic properties
  • Zedong Wu and Tariq Alkhalifah, "The optimized expansion based low-rank method for wavefield extrapolation", Geophysics 79 (2014): T51-T60. doi: 10.1190/geo2013-0174.1.
  • BibT​ex​ 
Keywords:
Reverse time migration, wave propagation, anisotropy, dispersion, Fourier transform
  • Tariq Alkhalifah, "Full-waveform inversion of the unwrapped phase of a model", Geophysical Prospecting 62 (2014): 397-403. DOI: 10.1111/1365-2478.12089.
  • BibT​ex​ 
Keywords:
Full waveform inversion, unwrapped phase
  • Alexey Stovas and Tariq Alkhalifah, "Mapping moveout approximations in TI media", Geophysics 79 (2014): C19-C26. doi: 10.1190/geo2013-0039.1.
  • BibT​ex​ 
Keywords:
traveltime, anisotropy, mapping
  • Tariq Alkhalifah, "Effective wavefield extrapolation in anisotropic media: accounting for resolvable anisotropy", Geophysical Prospecting 62 (2014): 1089-1099. DOI: 10.1111/1365-2478.12121.
  • BibTex​ 
Keywords:
wave field extrapolation, anisotropic media, resolvable anisotropy
  • Tariq Alkhalifah, "Prestack wavefield approximations", Geophysics 78 (2013): T141-T149. doi: 10.1190/geo2012-0532.1.
  • BibT​ex​ 
Keywords:
prestack, migration, modeling
  • Yunseok Choi and Tariq Alkhalifah, "Multisource waveform inversion of marine streamer data using normalized wavefield", Geophysics 78 (2013): R197-R206. doi: 10.1190/geo2012-0491.1.
  • BibT​ex​ 
Keywords:
inversion, sources, wave propagation, marine
  • Umair bin Waheed, Ivan Psencik, Vlastislav Cerveny, Einar Iversen and Tariq Alkhalifah, "Two-point paraxial traveltime formula for inhomogeneous isotropic and anisotropic media: Tests of accuracy", Geophysics 78 (2013): WC65-WC80. doi: 10.1190/geo2012-0406.1.
  • Bib​Tex​ 
Keywords:
anisotropy, ray tracing, traveltime
  • Umair bin Waheed, Tariq Alkhalifah and Alexey Stovas, "Diffraction traveltime approximation for TI media with an inhomogeneous background", Geophysics 78 (2013): WC103-WC111. doi: 10.1190/geo2012-0413.1.
  • BibTe​x​ 
Keywords:
diffraction, anisotropy, traveltime
  • Tariq Alkhalifah, "Residual extrapolation operators for efficient wavefield construction", Geophysical Journal International 193 (2013): 1027-1034. doi: 10.1093/gji/ggt040.
  • BibTe​x​ 
Keywords:
Numerical solutions, Fourier analysis, Numerical approximations and analysis, Body waves, Wave propagation, Acoustic properties
  • Tariq Alkhalifah, "Acoustic anisotropic wavefields through perturbation theory", Geophysics 78 (2013): WC41-WC50. doi: 10.1190/geo2012-0391.1.
  • BibT​ex​ 
Keywords:
acoustic, anisotropy, modeling
  • Xuxin Ma and Tariq Alkhalifah, "Wavefield extrapolation in pseudodepth domain", Geophysics 78 (2013): S81-S91. doi: 10.1190/geo2012-0237.1.
  • Bib​Tex​ 
Keywords:
Reverse time migration, wave equation, wave propagation, imaging
  • Xiaolei Song and Tariq Alkhalifah, "Modeling of pseudoacoustic P-waves in orthorhombic media with a low-rank approximation", Geophysics 78 (2013): C33-C40. doi: 10.1190/geo2012-0144.1.
  • BibT​ex​ 
Keywords:
3D, acoustic, modeling, P-wave, anisotropy
  • Akbar Zuberi and Tariq Alkhalifah, "Imaging by forward propagating the data: theory and application", Geophysical Prospecting 61 (2013): 248-267. DOI: 10.1111/1365-2478.12006.
  • Bib​Tex​ 
Keywords:
Forward propagating, Primaries, Multiples
  • Christos Saragiotis, Tariq Alkhalifah, and Sergey Fomel, "Automatic traveltime picking using local time-frequency maps", Geophysics 78 (2013): T53-T58. doi: 10.1190/geo2012-0026.1.
  • Bib​Tex​ 
Keywords:
traveltime, tomography, signal processing
  • Yunseok Choi and Tariq Alkhalifah, "Frequency-domain waveform inversion using the phase derivative", Geophysical Journal International 195 (2013): 1904-1916. doi: 10.1093/gji/ggt351.
  • Bib​Tex​ 
Keywords:
Inverse theory, Theoretical seismology, Wave propagation
  • Lyubov Skopintseva and Tariq Alkhalifah, "An analysis of AVO inversion for postcritical offsets in HTI media", Geophysics 78 (2012): N11-N20. doi:10.1190/geo2011-0288.1.
  • BibT​ex​ 
Keywords:
anisotropy, amplitude variation with offset (AVO), fractures, inversion, wide azimuth
  • Tariq Alkhalifah, "Traveltime approximations for inhomogeneous transversely isotropic media with a horizontal symmetry axis", Geophysical Prospecting 61 (2013), 495-503, DOI: 10.1111/j.1365-2478.2012.01067.x​.
  • Bib​Tex​ 
Keywords:
Azimuth, HTI media, Isotropic
  • Paul Sava and Tariq Alkhalifah, "Wide-azimuth angle gathers for anisotropic wave-equation migration", Geophysical Prospecting 61 (2013): 75-91. DOI: 10.1111/j.1365-2478.2012.01024.x​.
  • BibT​ex​ 
Keywords:
Wave-equation, Migration, Angle gathers, Anisotropy
  • Pavel Golikov, Tariq Alkhalifah and Alexey Stovas, "Prestack traveltimes for dip-constrained TI media", SEG Technical Program Expanded Abstracts (2012). doi: 10.1190/segam2012-0507.1.
  • BibTex​ 
Keywords:
anisotropy, modeling, prestack, velocity, TTI
  • Tariq Alkhalifah and Yunseok Choi, "Taming waveform inversion non-linearity through phase unwrapping of the model and objective functions", Geophysical Journal International 191 (2012): 1171-1178. doi: 10.1111/j.1365-246X.2012.05699.x​
  • Bib​Tex​ 
Keywords:
Time series analysis, Inverse theory, Seismic tomography
  • Alexey Stovas and Tariq Alkhalifah, "A new traveltime approximation for TI media", Geophysics 77 (2012): C37-C42. doi: 10.1190/geo2011-0158.1​.​
  • B​ibTex​ 
Keywords:
anisotropy, modeling, imaging
  • Yunseok Choi and Tariq Alkhalifah, "Application of multi-source waveform inversion to marine streamer data using the global correlation norm", Geophysical Prospecting 60 (2012): 748-758. DOI: 10.1111/j.1365-2478.2012.01079.x​.
  • Bib​Tex​ 
Keywords:
Global correlation, Marine streamer data, Modelled
  • Tariq Alkhalifah, "Prestack traveltime approximations", Geophysics 77 (2012): U31-U37. doi: 10.1190/geo2011-0465.1​.
  • Bib​Tex​ 
Keywords:
traveltime, prestack, velocity analysis
  • Alexey Stovas and Tariq Alkhalifah, "The TTI slowness surface approximation​", 2011 SEG Annual Meeting, 18-23 September, San Antonio, Texas: online.
  • ​​BibTex​​ 
Keywords:
TTI, slowness
  • Yunseok Choi and Tariq Alkhalifah, "Source-independent time-domain waveform inversion using convolved wavefields: Application to the encoded multisource waveform inversion", Geophysics 76 (2012): R125-R134. doi: 10.1190/geo2010-0210.1​​.​
  • BibT​ex​ 
Keywords:
inversion, sources, wavelet, modeling, wave equation
  • Tariq Alkhalifah and Paul Sava, "Migration Using a Transversely Isotropic Medium with Symmetry Normal to the Reflector Dip", International journal of Geophysics (2011): Article ID 530106, doi:10.1155/2011/530106.​
  • ​Bi​bTex​ 
Keywords:
Migration, transversely isotropic medium, symmetry normal to the reflector dip
  • Tariq Alkhalifah and Sergey Fome, "The basic components of residual migration in VTI media using anisotropy continuation", Journal of Petroleum Exploration and Production Technology 1 (2011): 17-22. doi: 10.1007/s13202-011-0006-6​.
  • ​BibTex​ 
Keywords:
Velocity continuation, Residual migration, Anisotropy
  • Tariq Alkhalifah, "Traveltime approximations for transversely isotropic media with an inhomogeneous background", Geophysics 76 (2011): WA31-WA42. doi: 10.1190/1.3555040​.​
  • BibT​ex​ 
Keywords:
traveltime approximations, transversely isotropic media, inhomogeneous background
  • Tariq Alkhalifah, "Wavefield dependency on virtual shifts in the source location", Geophysical Prospecting 59 (2011): 627-634. DOI: 10.1111/j.1365-2478.2010.00944.x​.
  • Bi​bTex​ 
Keywords:
Laplacian, Perturbation, Wavefield
  • Tariq Alkhalifah, "Scanning anisotropy parameters in complex media", Geophysics 76 (2011) U13-U22. doi: 10.1190/1.3553015​.
  • Bi​bTex​ 
Keywords:
anisotropic media, geophysical techniques, inhomogeneous media, partial differential equations, perturbation theory, seismology
  • Tariq Alkhalifah and Sergey Fomel, "Angle gathers in wave-equation imaging for transversely isotropic media", Geophysical Prospecting 59 (2011): 422 - 431. DOI: 10.1111/j.1365-2478.2010.00930.x​.
  • BibTex​ 
Keywords:
Angle gathers, Anisotropy
  • Tariq Alkhalifah, "Efficient traveltime compression for 3D prestack Kirchhoff migration", Geophysical Prospecting 59 (2011): 1-9. DOI: 10.1111/j.1365-2478.2010.00886.x​
  • BibTex​ 
Keywords:
Compression, Migration, Traveltime
  • Tariq Alkhalifah, "Acoustic wavefield evolution as a function of source location perturbation", Geophysical Journal International 183 (2010): 1324 - 1331. DOI: 10.1111/j.1365-246X.2010.04800.x.
  • Bib​Tex​ 
Keywords:
Numerical solutions, Wave propagation, Acoustic
  • Tariq Alkhalifah and Sergey Fomel, "An eikonal-based formulation for traveltime perturbation with respect to the source location", Geophysics 75 (2010): T175-T183. doi: 10.1190/1.3490390​​.
  • ​BibTex ​
Keywords:
eikonal, traveltime perturbation, source location
  • Tariq Alkhalifah and Paul Sava, "A transversely isotropic medium with a tilted symmetry axis normal to the reflector", Geophysics 75 (2010): A19-A24. doi: 10.1190/1.3409114​​.
  • BibTex​ 
Keywords:
transversely isotropic media
  • ​Tariq Alkhalifah, "Prestack phase-shift migration of separate offsets in laterally inhomogeneous media",  Geophysics 75 (2010): S95-S101.​ doi: 10.1190/1.3381884​​.
  • BibTex​ 
Keywords:
prestack phase-shift migration, laterally inhomogeneous media