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sep:research:theses:sep151 [2014/03/30 17:36]
sjoerd
sep:research:theses:sep151 [2015/05/27 02:06] (current)
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Phase velocity maps are found through a novel version of eikonal tomography. An eikonal equation is derived for an elliptically anisotropic wave-mode at a single frequency propagating in two dimensions. This eikonal equation relates the spatial derivatives of phase travel-time surfaces to the local elliptically anisotropic slowness. Measurements of the spatial derivatives of phase travel-time surfaces for virtual sources retrieved at all stations can be inverted into elliptical-anisotropic phase-velocity maps. The method is applied to Scholte and Love waves at Valhall and Scholte waves at Ekofisk. The isotropic component of phase velocities generally images the same features as the group velocities from straight-ray tomography. The fast direction of anisotropy of Scholte-wave phase velocities form a large circular pattern over the Valhall and Ekofisk fields. They are likely related to the production-induced sea floor subsidence bowl. Phase velocity maps are found through a novel version of eikonal tomography. An eikonal equation is derived for an elliptically anisotropic wave-mode at a single frequency propagating in two dimensions. This eikonal equation relates the spatial derivatives of phase travel-time surfaces to the local elliptically anisotropic slowness. Measurements of the spatial derivatives of phase travel-time surfaces for virtual sources retrieved at all stations can be inverted into elliptical-anisotropic phase-velocity maps. The method is applied to Scholte and Love waves at Valhall and Scholte waves at Ekofisk. The isotropic component of phase velocities generally images the same features as the group velocities from straight-ray tomography. The fast direction of anisotropy of Scholte-wave phase velocities form a large circular pattern over the Valhall and Ekofisk fields. They are likely related to the production-induced sea floor subsidence bowl.
-{{:private:docs:sep151:vanderwaaij.jpg?500}} +**Reproducibility and source codes**\\ 
-"After the Defense" - Nicolaas van der Waay+This thesis has been tested for [[sep:research:reproducible|reproducibility]]. The Make rules, source codes and scripts are made available for [[http://sepwww.stanford.edu/data/media/private/docs/sep151/sep151.tar.gz|download]] (2.1mb).\\ 
 + 
 +**Defense**\\ 
 +[[http://sepwww.stanford.edu/data/media/public/docs/sep151/deridder-defense.pptx|Defense presentation]]\\ 
 + 
 +__Defense Committee__\\ 
 +Philip H. Scherrer - Chair\\ 
 +Biondo L. Biondi* - Principal Advisor\\ 
 +Jon F. Claerbout*\\ 
 +George C. Papanicolaou*\\ 
 +Jesse F. Lawrence*\\ 
 +Joseph A. Dellinger*\\ 
 +Robert G. Clapp\\ 
 + 
 +(* member of reading committee)\\ 
 + 
 +__Place and Time__\\ 
 +2:15 p.m., February 10<sup>th</sup>, 2014\\ 
 +Hartley Conference Center\\ 
 +Mitchell Earth Science Building\\ 
 +Stanford University\\ 
 + 
 +{{:private:docs:sep151:vanderwaaij.jpg?500}}\\ 
 +"After the Defense" - [[http://nl.wikipedia.org/wiki/Nicolaas_van_der_Waay|Nicolaas van der Waay]]
/web/html/data/attic/sep/research/theses/sep151.1396200966.txt.gz · Last modified: 2015/05/26 22:40 (external edit)
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