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dc.contributor.advisorAlkhalifah, Tariq Ali
dc.contributor.authorAlmubarak, Mohammed S.
dc.date.accessioned2013-05-29T08:40:44Z
dc.date.available2014-05-28T00:00:00Z
dc.date.issued2013-05
dc.identifier.citationAlmubarak, M. S. (2013). Local Ray-Based Traveltime Computation Using the Linearized Eikonal Equation. KAUST Research Repository. https://doi.org/10.25781/KAUST-K9X1N
dc.identifier.doi10.25781/KAUST-K9X1N
dc.identifier.urihttp://hdl.handle.net/10754/292969
dc.description.abstractThe computation of traveltimes plays a critical role in the conventional implementations of Kirchhoff migration. Finite-difference-based methods are considered one of the most effective approaches for traveltime calculations and are therefore widely used. However, these eikonal solvers are mainly used to obtain early-arrival traveltime. Ray tracing can be used to pick later traveltime branches, besides the early arrivals, which may lead to an improvement in velocity estimation or in seismic imaging. In this thesis, I improved the accuracy of the solution of the linearized eikonal equation by constructing a linear system of equations (LSE) based on finite-difference approximation, which is of second-order accuracy. The ill-conditioned LSE is initially regularized and subsequently solved to calculate the traveltime update. Numerical tests proved that this method is as accurate as the second-order eikonal solver. Later arrivals are picked using ray tracing. These traveltimes are binned to the nearest node on a regular grid and empty nodes are estimated by interpolating the known values. The resulting traveltime field is used as an input to the linearized eikonal algorithm, which improves the accuracy of the interpolated nodes and yields a local ray-based traveltime. This is a preliminary study and further investigation is required to test the efficiency and the convergence of the solutions.
dc.language.isoen
dc.subjectLinearized
dc.subjectEikonal
dc.subjectRay Tracing
dc.subjectLocal
dc.subjectTraveltime
dc.titleLocal Ray-Based Traveltime Computation Using the Linearized Eikonal Equation
dc.typeThesis
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.rights.embargodate2014-05-28
thesis.degree.grantorKing Abdullah University of Science and Technology
dc.contributor.committeememberMahmoud, Sherif
dc.contributor.committeememberMai, Paul Martin
thesis.degree.disciplineEarth Science and Engineering
thesis.degree.nameMaster of Science
dc.rights.accessrightsAt the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2014-05-28.
refterms.dateFOA2014-05-28T00:00:00Z


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