eprintid: 1418973
rev_number: 24
eprint_status: archive
userid: 608
dir: disk0/01/41/89/73
datestamp: 2014-02-10 19:35:10
lastmod: 2022-01-18 23:39:28
status_changed: 2014-02-10 19:35:10
type: thesis
metadata_visibility: show
item_issues_count: 0
creators_name: Schardong, L
title: Toward a high resolution tomographic imaging of the lowermost mantle
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F57
keywords: Seismology, Tomography, Body waves, Data analysis
abstract: The D" layer is one of Earth's most heterogeneous location, hosting poorly understood features, which are most likely linked to the global dynamics of the mantle. Present days tomographic approaches cannot resolve correctly this area. The resolution of images from Earth's inner structure is strongly linked to precisely localizing earthquakes, and to have a good knowlegde of the frequency content of seismic waves. This thesis aims at building a global database of seismic travel times, data used for the development of tomographic images. Our method uses a more precise determination of the depths of earthquakes, allowing an improvement in measuring travel times. To a better evaluation of the frequency content, these measurements are performed in several frequency bands. A new approach for the computation of corrections to the complexity of the crust is presented as well. Finally, a preliminary imaging is presented, at regional and global scale, under the approximation of the ray theory, before a more complete description under Born approximation.
date: 2012-11-05
vfaculties: VMPS
elements_source: Manually entered
elements_id: 926542
language_elements: French/English
lyricists_name: Schardong, Lewis
lyricists_id: LSCHA35
full_text_status: none
thesis_type: Doctoral
citation:        Schardong, L;      (2012)    Toward a high resolution tomographic imaging of the lowermost mantle.                   Doctoral thesis , UNSPECIFIED.