Zobrazeno 1 - 10
of 87
pro vyhledávání: '"John C. Bancroft"'
Publikováno v:
GEOPHYSICS. 81:R15-R27
We have studied elastic wave scattering and iterative inversion in the context of the Kirchhoff approximation. The approach is more consistent with the weak-contrast reflectivity functions of Zoeppritz equations as compared to the Born approximation.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05304d41264a51e7f76d85e6fabd86df
https://doi.org/10.1190/geo2014-0560.1
https://doi.org/10.1190/geo2014-0560.1
Autor:
John C. Bancroft, Xiang Du
Publikováno v:
ASEG Extended Abstracts. 2007:1-4
An efficient algorithm is presented that estimates the apparent source of a microseismic event from the first arrival clock-times at four receiver locations in a 3D volume. Wavefronts are assumed to be locally spherical in a constant velocity medium.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aabc35a8cef0e79cca778d2d913bd151
https://doi.org/10.1071/aseg2007ab010
https://doi.org/10.1071/aseg2007ab010
Publikováno v:
Geophysical Prospecting. 55:853-869
Seismic anisotropy in dipping shales results in imaging and positioning problems for underlying structures. We develop an anisotropic reverse-time depth migration approach for P-wave and SV-wave seismic data in transversely isotropic (TI) media with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa8accfed751bef90fb5b00c0947be26
https://doi.org/10.1111/j.1365-2478.2007.00652.x
https://doi.org/10.1111/j.1365-2478.2007.00652.x
Publikováno v:
SEG Technical Program Expanded Abstracts 2015.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3330c8819aba4ea94fa40568d47622c7
https://doi.org/10.1190/segam2015-5932503.1
https://doi.org/10.1190/segam2015-5932503.1
Autor:
John C. Bancroft
Publikováno v:
ASEG Extended Abstracts. 2006:1-4
Traveltime computations are an integral part of modelling and imaging seismic data by providing efficient kinematic information on the location of propagated energy. The traveltimes may be computed analytically using simplifying assumptions, or may b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::986a6e757f4f22769351ea351770e61a
https://doi.org/10.1071/aseg2006ab007
https://doi.org/10.1071/aseg2006ab007
Autor:
Pavan Elapavuluri, John C. Bancroft
Publikováno v:
ASEG Extended Abstracts. 2004:1-4
In order to extend seismic processing techniques to anisotropic media, it is required that we have a measure of the different anisotropy parameters. The purpose of this study is to estimate the Thomsen?s parameters, e and d, for transversely isotropi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::629d157f4346b451066102bc6e4cca16
https://doi.org/10.1071/aseg2004ab039
https://doi.org/10.1071/aseg2004ab039
Autor:
John Millar, John C. Bancroft
Publikováno v:
ASEG Extended Abstracts. 2004:1-4
The efficient solution of linear systems is an important part of many routines in geophysical data processing and inversion. One option for the solution of very large systems is the multigrid method. The algorithms are fast, robust, and able to solve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a531d42841a12445a8acb574ab7cc097
https://doi.org/10.1071/aseg2004ab007
https://doi.org/10.1071/aseg2004ab007
Autor:
John C. Bancroft
Publikováno v:
ASEG Extended Abstracts. 2003:1-4
The Kirchhoff migration algorithm is heuristically derived using the mathematics of least squares inversion and the concept of matched filters. These concepts are visualized with cartoon descriptions that describe inversion using linear algebra and t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a93e5eadb98d29ee9fa722b2c360b46c
https://doi.org/10.1071/aseg2003ab008
https://doi.org/10.1071/aseg2003ab008
Publikováno v:
SEG Technical Program Expanded Abstracts 2014.
SUMMARY Turning-ray tomography is a good tool for estimating near surface velocity structure, especially in areas where conventional refraction statics fail such as the case of a hidden layer. The velocity model from turning-ray tomography can be use
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41d2f890354d5020f4b957965b9549cf
https://doi.org/10.1190/segam2014-0857.1
https://doi.org/10.1190/segam2014-0857.1
Autor:
Xinxiang Li, John C. Bancroft
Publikováno v:
ASEG Extended Abstracts. 2001:1-4
A method is presented for estimating residual statics that are computed prior to normal moveout correction. No velocity information is required, and the offset and structure terms are eliminated from the decomposition. Model source (shot) records are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::34500fe3631fe1fd7fecad6034b1154a
https://doi.org/10.1071/aseg2001ab003
https://doi.org/10.1071/aseg2001ab003