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Assessment of an MASW technique incorporating discrete particle modelling
Donohue, Shane; Long, Michael (Michael M.)
A Discrete Particle Scheme (DPS) consisting of interacting circular particles is utilised to examine the Multichannel Analysis of Surface Waves (MASW) technique. Synthetic earth models of various complexity are generated using the DPS and analysed by the MASW dispersion and inversion techniques. For normally dispersive cases, dominated by the fundamental mode, the MASW profiles closely match the true synthetic shear wave velocity (Vs) profiles. When tested on a model that contains a low velocity layer, the accuracy is reduced. MASW field tests at a highly uniform site in Norway (Onsøy) and a site with distinctive layer boundaries in Ireland (Ballinasloe) result in highly repeatable profiles of Vs. Resolution of dispersion curves at low frequencies (<10Hz) is a problem at the Ballinasloe test site, which limits the depth of penetration of the technique. MASW inversion results compare excellently with downhole seismic cone tests at the Onsøy test site and reasonably with a seismic refraction survey at the Ballinasloe site. Not applicable ke,au,SB-09/09/2011
Keyword(s): Geophysics; Surface waves; Shear wave velocity; Discrete particle modelling; Seismic cone tests; Shear waves; Soils--Testing
Publication Date:
Type: Journal article
Peer-Reviewed: Unknown
Language(s): English
Institution: University College Dublin
Publisher(s): Environmental & Engineering Geophysical Society
File Format(s): other; application/pdf
First Indexed: 2012-08-25 05:17:47 Last Updated: 2018-10-11 16:30:30