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Phase-scanning approach to correct time-shift inaccuracies in the surface-wave walk-away method

Obando, Edwin LU ; Park, Choon B.; Rydén, Nils LU and Ulriksen, Peter LU (2010) In Soil Dynamics and Earthquake Engineering 30(12). p.1528-1539
Abstract
In order to maintain lateral resolution while maximizing investigation depth in a multichannel surface wave method, it is beneficial to implement the walk-away approach by using a relatively short receiver spread. Combined walk-away records, however, normally suffer from time-shift inaccuracies that adversely influence the subsequent dispersion imaging process. Time-shift inaccuracies produce phase discontinuities which can generate false apparent higher modes in the dispersion images misleading the correct interpretation of the dispersion curve. To minimize these adverse effects, we present a phase-scanning approach that searches for an optimum phase shift to correct the phase shift generated by the walk-away method. Results obtained from... (More)
In order to maintain lateral resolution while maximizing investigation depth in a multichannel surface wave method, it is beneficial to implement the walk-away approach by using a relatively short receiver spread. Combined walk-away records, however, normally suffer from time-shift inaccuracies that adversely influence the subsequent dispersion imaging process. Time-shift inaccuracies produce phase discontinuities which can generate false apparent higher modes in the dispersion images misleading the correct interpretation of the dispersion curve. To minimize these adverse effects, we present a phase-scanning approach that searches for an optimum phase shift to correct the phase shift generated by the walk-away method. Results obtained from synthetic and real-world field data show that for the specific case of a single dominating mode the proposed approach reduces the distortions in the dispersion image caused by the walk-away approach. The proposed method is especially efficient in the presence of ambient random noise. (C) 2010 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soil Dynamics and Earthquake Engineering
volume
30
issue
12
pages
1528 - 1539
publisher
Elsevier
external identifiers
  • wos:000282497000009
  • scopus:77956226929
ISSN
0267-7261
DOI
10.1016/j.soildyn.2010.07.006
language
English
LU publication?
yes
id
2e94d24a-2373-4ef1-8ca3-fac1c684550b (old id 1726325)
date added to LUP
2010-12-03 15:45:01
date last changed
2018-05-29 10:52:55
@article{2e94d24a-2373-4ef1-8ca3-fac1c684550b,
  abstract     = {In order to maintain lateral resolution while maximizing investigation depth in a multichannel surface wave method, it is beneficial to implement the walk-away approach by using a relatively short receiver spread. Combined walk-away records, however, normally suffer from time-shift inaccuracies that adversely influence the subsequent dispersion imaging process. Time-shift inaccuracies produce phase discontinuities which can generate false apparent higher modes in the dispersion images misleading the correct interpretation of the dispersion curve. To minimize these adverse effects, we present a phase-scanning approach that searches for an optimum phase shift to correct the phase shift generated by the walk-away method. Results obtained from synthetic and real-world field data show that for the specific case of a single dominating mode the proposed approach reduces the distortions in the dispersion image caused by the walk-away approach. The proposed method is especially efficient in the presence of ambient random noise. (C) 2010 Elsevier Ltd. All rights reserved.},
  author       = {Obando, Edwin and Park, Choon B. and Rydén, Nils and Ulriksen, Peter},
  issn         = {0267-7261},
  language     = {eng},
  number       = {12},
  pages        = {1528--1539},
  publisher    = {Elsevier},
  series       = {Soil Dynamics and Earthquake Engineering},
  title        = {Phase-scanning approach to correct time-shift inaccuracies in the surface-wave walk-away method},
  url          = {http://dx.doi.org/10.1016/j.soildyn.2010.07.006},
  volume       = {30},
  year         = {2010},
}