Multi-offset phase analysis of surface wave data (MOPA)

Inaccuracy in the shear wave velocity profile inverted from surface wave data manifests from both modelling error and data uncertainty. An alternative method for dispersion curve evaluation by weighted linear regression of phase-offset data can be applied to both equispaced and non-equispaced data f...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied geophysics 2006-08, Vol.59 (4), p.300-313
Main Authors: Strobbia, Claudio, Foti, Sebastiano
Format: Article
Language:English
Subjects:
Applied geophysics
Earth sciences
Earth, ocean, space
Error propagation
Exact sciences and technology
Internal geophysics
MASW
Signal processing
Surface waves
Uncertainty
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Inaccuracy in the shear wave velocity profile inverted from surface wave data manifests from both modelling error and data uncertainty. An alternative method for dispersion curve evaluation by weighted linear regression of phase-offset data can be applied to both equispaced and non-equispaced data for objective identification of these often overlooked error sources. From field data, near-field effects are noted to at most half a wavelength and lateral discontinuities identified by marked changes in wavenumber with offset. Transition frequencies to dominant higher modes appear lower than when identified from standard plane-wave transform methods. Effects can be discriminated by their frequency, position or offset dependence. When a non-corrupt dispersion curve is extracted, the errors are up to 5% at low frequency. Through theoretical Gaussian error propagation analysis, the resulting shear wave velocity profile shows up to 18% uncertainty at depth.
ISSN:0926-9851
1879-1859
DOI:10.1016/j.jappgeo.2005.10.009