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sep:research:theses:sep151 [2014/08/11 22:14]
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.
-**Table of contents**\\ +**Reproducibility and source codes**\\ 
-This thesis has been tested for [[sep:research:reproducible|reproducibility]].\\ +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).\\
-The Make rules and source codes are made available for download [[http://sepwww.stanford.edu/data/media/private/docs/sep151/sources.tar|here]].\\+
**Defense**\\ **Defense**\\
/web/html/data/attic/sep/research/theses/sep151.1407795278.txt.gz · Last modified: 2015/05/26 22:40 (external edit)
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