Results 231 to 240 of about 3,361 (261)
Some of the next articles are maybe not open access.
Characteristics of Azimuthal Anisotropy in Narrow-Azimuth Marine Streamer Data
68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006, 2006Towed-streamer acquisition samples a narrow range of azimuths. We discuss the resulting sensitivity of such data to azimuthal velocity anisotropy. Correction for such effects, for example by using a residual moveout correction before migration, can significantly improve the imaging in such situations.
openaire +1 more source
Azimuthal Anisotropy in Marine Streamer Data
2nd EAGE St Petersburg International Conference and Exhibition on Geosciences, 2006Towed-streamer acquisition samples a narrow range of azimuths. We discuss the resulting sensitivity of such data to azimuthal velocity anisotropy. Correction for such effects, using either a residual moveout correction before migration or incorporating the anisotropy within the migration step itself, can significantly improve the imaging of the data.
G. Williams, R.J. Wombell
openaire +1 more source
Statistical moments for azimuthal anisotropy characterization
SEG Technical Program Expanded Abstracts 2014, 2014The benefits of separating azimuthal AVO into AVO (Amplitude Versus Offset) and AVAz (Amplitude Versus Azimuth) have been demonstrated using Fourier Coefficients. The main advantage is to avoid coupling between the isotropic and anisotropic properties estimates.
openaire +1 more source
MAZ Depth-Velocity Modelling and Imaging with Azimuthal Anisotropy
PGCE 2010, 2010Processing of multi and wide-azimuth seismic data faces some new challenges, and one of them is depth-velocity modelling and imaging with azimuthal velocity anisotropy. Analysis of multi-azimuth data very often reveals noticeable fluctuations in moveout between different acquisition directions.
Sergey Birdus +2 more
openaire +1 more source
Azimuthal Anisotropy Results from STAR
Nuclear Physics A, 2013Abstract Recent advances in the studies of eventwise azimuthal anisotropy from STAR have been made possible by the high statistics 200 GeV Au + Au datasets taken in 2010 and by the broad range of energies recorded during the first phase of the RHIC beam energy scan.
openaire +1 more source
Azimuthal Misalignment and Surface Anisotropy as Sources of Error in Ellipsometry
Applied Optics, 1970In employing ellipsometry to determine the complex refractive index of a reflecting surface, a small systematic error in the zero-angle positions of the polarizers is shown under certain circumstances to have a large effect on the values of the optical constants calculated. The effect of superficial optical anisotropy on ellipsometry in general, and on
M J, Dignam, M, Moskovits
openaire +2 more sources
The depth distribution of azimuthal anisotropy in the continental upper mantle
Nature, 2007The most likely cause of seismic anisotropy in the Earth's upper mantle is the lattice preferred orientation of anisotropic minerals such as olivine. Its presence reflects dynamic processes related to formation of the lithosphere as well as to present-day tectonic motions.
Federica, Marone, Barbara, Romanowicz
openaire +2 more sources
Direct photon spectra and azimuthal anisotropy
Nuclear and Particle Physics Proceedings, 2016The transverse momentum distribution and azimuthal anisotropy of direct photon production in Au+Au collisions at sNN=200 GeV were measured in the PHENIX experiment at RHIC. Through the external conversion method, earlier yield and v2 measurements were extended down to pT = 0.4 GeV/c.
openaire +1 more source
Image-guided WEMVA for azimuthal anisotropy
SEG Technical Program Expanded Abstracts 2013, 2013Azimuthal anisotropy is common in layered basins with strong folding and fracturing effects. Traditional processing on individual azimuths usually yields images with inconsistent depths. In this paper, we propose to use an image obtained from one azimuth to constrain the image-space velocity analysis on other azimuths.
openaire +1 more source
Observations of Azimuthal Anisotropy in Seismic Gathers
69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007, 2007D029 Observations of Azimuthal Anisotropy in Seismic Gathers D. Gray* (CGG Veritas) SUMMARY A method for displaying prestack seismic data that highlights azimuthal anisotropy is shown. Using this method to make observations of azimuthal anisotropy in prestack seismic data makes it clear that azimuthal anisotropy is observed in all types of seismic data
openaire +1 more source