| dc.creator | HUBRAL, P | |
| dc.creator | SCHLEICHER, J | |
| dc.creator | TYGEL, M | |
| dc.date | 1993 | |
| dc.date | MAY | |
| dc.date | 2014-12-16T11:33:17Z | |
| dc.date | 2015-11-26T17:53:14Z | |
| dc.date | 2014-12-16T11:33:17Z | |
| dc.date | 2015-11-26T17:53:14Z | |
| dc.date.accessioned | 2018-03-29T00:36:49Z | |
| dc.date.available | 2018-03-29T00:36:49Z | |
| dc.identifier | Geophysics. Soc Exploration Geophysicists, v. 58, n. 5, n. 692, n. 702, 1993. | |
| dc.identifier | 0016-8033 | |
| dc.identifier | WOS:A1993LC36100009 | |
| dc.identifier | 10.1190/1.1443453 | |
| dc.identifier | http://www.repositorio.unicamp.br/jspui/handle/REPOSIP/52643 | |
| dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/52643 | |
| dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/52643 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1290474 | |
| dc.description | Zero-offset reflections resulting from point sources are often computed on a large scale in three-dimensional (3-D) laterally inhomogeneous isotropic media with the help of ray theory. The geometrical-spreading factor and the number of caustics that determine the shape of the reflected pulse are then generally obtained by integrating the so-called dynamic ray-tracing system down and up to the two-way normal incidence ray. Assuming that this ray is already known, we show that one integration of the dynamic ray-tracing system in a downward direction with only the initial condition of a point source at the earth's surface is in fact sufficient to obtain both results. To establish the Fresnel zone of the zero-offset reflection upon the reflector requires the same single downward integration. By performing a second downward integration (using the initial conditions of a plane wave at the earth's surface) the complete Fresnel volume around the two-way normal ray can be found. This should be known to ascertain the validity of the computed zero-offset event. A careful analysis of the problem as performed here shows that round-trip integrations of the dynamic ray-tracing system following the actually propagating wavefront along the two-way normal ray need never be considered. In fact some useful quantities related to the two-way normal ray (e.g., the normal-moveout velocity) require only one single integration in one specific direction only. Finally, a two-point ray tracing for normal rays can be derived from one-way dynamic ray tracing. | |
| dc.description | 58 | |
| dc.description | 5 | |
| dc.description | 692 | |
| dc.description | 702 | |
| dc.language | en | |
| dc.publisher | Soc Exploration Geophysicists | |
| dc.publisher | Tulsa | |
| dc.relation | Geophysics | |
| dc.relation | Geophysics | |
| dc.rights | aberto | |
| dc.source | Web of Science | |
| dc.subject | Inhomogeneous-media | |
| dc.title | 3-DIMENSIONAL PRIMARY ZERO-OFFSET REFLECTIONS | |
| dc.type | Artículos de revistas | |
