Guided waves in near-surface seismic surveys

Détails

ID Serval
serval:BIB_405D8F83EB0A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Guided waves in near-surface seismic surveys
Périodique
Geophysical Research Letters
Auteur(s)
Roth M., Holliger K., Green A.
ISSN-L
0094-8276
Statut éditorial
Publié
Date de publication
1998
Peer-reviewed
Oui
Volume
25
Pages
1071-1074
Langue
anglais
Résumé
Much of the Earth's surface is covered by a thin blanket of unconsolidated
sediments or weathered bedrock. Boundaries within or at the base
of this surficial layer (e.g. watertable, bedrock surface, transition
to unweathered rock) are commonly associated with a strong seismic
contrast. Layers contained between the surface and shallowest boundaries
may be efficient waveguides and, as such, associated with significant
source-generated seismic noise. Whereas Rayleigh waves (groundroll)
can be described in terms of normal modes, we demonstrate that the
faster shingled guided waves can be explained in terms of leaking
modes. Due to the relatively high Poisson's ratios in the shallow
subsurface, guided waves are composed dominantly of multiply reflected
P-waves. We compare our results with those obtained using a conventional
acoustic waveguide approximation and discuss methods for extracting
information from guided waves for geotechnical and environmental
applications.
Open Access
Oui
Création de la notice
25/11/2013 19:28
Dernière modification de la notice
08/05/2019 17:36
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