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Gerard Schuster [8]Gerard T. Schuster [6]
  1.  27
    Opportunities and Pitfalls in Surface-Wave Interpretation.Gerard T. Schuster, Jing Li, Kai Lu, Ahmed Metwally, Abdullah AlTheyab & Sherif Hanafy - 2017 - Interpretation: SEG 5 (1):T131-T141.
    Many explorationists think of surface waves as the most damaging noise in land seismic data. Thus, much effort is spent in designing geophone arrays and filtering methods that attenuate these noisy events. It is now becoming apparent that surface waves can be a valuable ally in characterizing the near-surface geology. This review aims to find out how the interpreter can exploit some of the many opportunities available in surface waves recorded in land seismic data. For example, the dispersion curves associated (...)
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  2.  16
    Qualities of a Good Reviewer.Huyen Bui, Dallas Dunlap, Thomas Hearon, Donald Herron, Chaoli Lan, Shu Jiang, Kurt Marfurt, Balazs Nemeth, Osareni Ogiesoba, Gerard Schuster & Hongliu Zeng - 2017 - Interpretation: SEG 5 (3):1A-3A.
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  3.  5
    Ray-Map Migration of Transmitted Surface Waves.Jing Li & Gerard T. Schuster - 2016 - Interpretation: SEG 4 (4):SQ33-SQ40.
    Near-surface normal faults can sometimes separate two distinct zones of velocity heterogeneity, where the medium on one side of the fault has a faster velocity than on the other side. Therefore, the slope of surface-wave arrivals in a common-shot gather should abruptly change near the surface projection of the fault. We present ray-map imaging method that migrates transmitted surface waves to the fault plane, and therefore it roughly estimates the orientation, depth, and location of the near-surface fault. The main benefits (...)
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  4.  29
    Introduction to Special Section: Least-Squares Migration.Aimee Mao, Gerard Schuster, Kurt Marfurt, Yonghe Sun, Chong Zeng, Bin Wang, Bertrand Duquet, Paul Singer, Wei Dai, Gaurav Dutta, Jerry Young, Yu Zhang & Michael Kiehn - 2017 - Interpretation: SEG 5 (3):SNi-SNii.
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  5.  11
    Introduction to Special Section: Characterizing the Subsurface with Multiples and Surface Waves.Gerard Schuster, Dan Whitmore, John Louie, Yibo Wang, Shuki Ronen, Kazuya Shiraishi, Ge Zhan & Dirk Vershuur - 2016 - Interpretation: SEG 4 (4):SQi-SQi.
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  6.  12
    Tutorial for Wave Equation Inversion of Skeletonized Data.Kai Lu, Jing Li, Bowen Guo, Lei Fu & Gerard Schuster - 2017 - Interpretation: SEG 5 (3):SO1-SO10.
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  7.  5
    Two Robust Imaging Methodologies for Challenging Environments: Wave-Equation Dispersion Inversion of Surface Waves and Guided Waves and Supervirtual Interferometry + Tomography for Far-Offset Refractions.Jing Li, Kai Lu, Sherif Hanafy & Gerard Schuster - 2018 - Interpretation: SEG 6 (4):SM27-SM37.
    Two robust imaging technologies are reviewed that provide subsurface geologic information in challenging environments. The first one is wave-equation dispersion inversion of surface waves and guided waves for the shear-velocity and compressional-velocity models, respectively. The other method is traveltime inversion for the velocity model, in which supervirtual refraction interferometry is used to enhance the signal-to-noise ratio of far-offset refractions. We have determined the benefits and liabilities of both methods with synthetic seismograms and field data. The benefits of WD are that (...)
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  8.  10
    Specular Interferometric Imaging of Vertical Seismic Profile Data.Yunsong Huang, Ruiqing He, Chaiwoot Boonyasiriwat, Yi Luo & Gerard Schuster - 2015 - Interpretation: SEG 3 (3):SW57-SW62.
    We introduce the concept of seminatural migration of multiples in vertical seismic profile data, denoted as specular interferometric migration, in which part of the kernel is computed by ray tracing and the other part is obtained from the data. It has the advantage over standard migration of ghost reflections, in that the well statics are eliminated and the migration image is no more sensitive to velocity errors than migration of VSP primaries. Moreover, the VSP ghost image has significantly more subsurface (...)
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  9.  10
    Introduction to Special Section: Geophysical Imaging and Interpretation of Outcrops.Remke L. Van Dam, Joep E. A. Storms, Gerard T. Schuster, Alireza Malehmir, Jeroen A. M. Kenter & Emanuele Forte - 2015 - Interpretation: SEG 3 (3):SYi-SYii.
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  10.  2
    Tutorial for Wave-Equation Inversion of Skeletonized Data.Kai Lu, Jing Li, Bowen Guo, Lei Fu & Gerard Schuster - 2017 - Interpretation 5 (3):SO1-SO10.
    Full-waveform inversion of seismic data is often plagued by cycle-skipping problems such that an iterative optimization method often gets stuck in a local minimum. To avoid this problem, we simplify the objective function so that the iterative solution can quickly converge to a solution in the vicinity of the global minimum. The objective function is simplified by only using parsimonious and important portions of the data, which are defined as skeletonized data. We have developed a mostly nonmathematical tutorial that explains (...)
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  11.  8
    Tomographic Resolution Limits for Diffraction Imaging.Yunsong Huang, Dongliang Zhang & Gerard T. Schuster - 2015 - Interpretation: SEG 3 (1):SF15-SF20.
    We derived formulas for the tomographic resolution limits [Formula: see text] of diffraction data. Resolution limits exhibited that diffractions can provide twice or more the tomographic resolution of specular reflections and therefore led to more accurate reconstructions of velocities between layers. Numerical simulations supported this claim in which the tomogram inverted from diffraction data was noticeably more resolved compared to that inverted from specular data. The specular synthetics were generated by sources on the surface, and the diffraction data were generated (...)
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  12.  6
    Introduction to Special Section: Recent Advances with Well Whisperers.Gerard Schuster, Julie Shemeta, Bjorn Paulsson, Xiang Xiao, Brian Hornby, Martin Karrenbach, Mike Fehler, Bob Hardage, Lianjie Huang, Grace Yu & Jianhua Yu - 2015 - Interpretation: SEG 3 (3):SWi-SWi.
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  13.  4
    Outcrops and Well Logs as a Practicum for Calibrating the Accuracy of Traveltime Tomograms.Sherif M. Hanafy, Ann Mattson, Ronald L. Bruhn, Shengdong Liu & Gerard T. Schuster - 2015 - Interpretation: SEG 3 (3):SY27-SY40.
    We have developed two case studies demonstrating the use of high-resolution seismic tomography and reflection imaging in the field of paleoseismology. The first study, of the Washington fault in southern Utah, USA, evaluated the subsurface deposits in the hanging wall of the normal fault. The second study, of the Mercur fault in the eastern Great Basin of Utah, USA, helped to establish borehole locations for sampling subsurface colluvial deposits buried deeper than those previously trenched along the fault zone. We evaluated (...)
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  14.  2
    Skeletonized Wave-Equation Inversion in Vertical Symmetry Axis Media Without Too Much Math.Shihang Feng & Gerard T. Schuster - 2017 - Interpretation: SEG 5 (3):SO21-SO30.
    We have developed a tutorial for skeletonized inversion of pseudo-acoustic anisotropic vertical symmetry axis data. We first invert for the anisotropic models using wave-equation traveltime inversion. Here, the skeletonized data are the traveltimes of transmitted and/or reflected arrivals that lead to simpler misfit functions and more robust convergence compared with full-waveform inversion. This provides a good starting model for waveform inversion. The effectiveness of this procedure is illustrated with synthetic data examples and a marine data set recorded in the Gulf (...)
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