Combined use of active and passive surface waves
(2005) In Journal of Environmental & Engineering Geophysics 10(3). p.323-334- Abstract
- With a surface wave method to estimate shear-wave velocity (Vs) from dispersion curve(s) of known mode(s), accurate modal identification is obviously a crucial issue. In this regard, the dispersion imaging method is an essential processing tool as it can unfold the multi-modal nature of surface waves through direct wavetield transformations. When a combined dispersion curve of an extended frequency range is prepared from analyses of both passive and active surface waves attempting to increase the maximum depth of Vs estimation, the modal nature of the passive curve (as well as the active one) must be assessed although it has usually been considered the fundamental mode. We report two experimental survey cases performed at the same soil... (More)
- With a surface wave method to estimate shear-wave velocity (Vs) from dispersion curve(s) of known mode(s), accurate modal identification is obviously a crucial issue. In this regard, the dispersion imaging method is an essential processing tool as it can unfold the multi-modal nature of surface waves through direct wavetield transformations. When a combined dispersion curve of an extended frequency range is prepared from analyses of both passive and active surface waves attempting to increase the maximum depth of Vs estimation, the modal nature of the passive curve (as well as the active one) must be assessed although it has usually been considered the fundamental mode. We report two experimental survey cases performed at the same soil site, but at two different times, employing the passive and active versions of the multichannel analysis of surface waves (MASW) method for an increased investigation depth. In the earlier survey, the modal nature of the imaged dispersion trends from the passive (<20 Hz) and active (>20 Hz) data sets was identified as the fundamental mode, whereas it was confidently re-identified as the first higher mode from the later survey. Modal inspection with the dispersion image created by combining passive and active image data sets was the key to this confident analysis. The modal nature of the passive curve was identified from its context with active curves, whose confident analysis therefore had to come first. An active data set acquired with a small (<1.0 m) receiver spacing and an impact point located close to the receivers appears important for this purpose. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/221379
- author
- Park, C B ; Miller, R D ; Rydén, Nils LU ; Xia, J and Ivanov, J
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Environmental & Engineering Geophysics
- volume
- 10
- issue
- 3
- pages
- 323 - 334
- publisher
- ENVIRONMENTAL ENGINEERING GEOPHYSICAL SOCIETY
- external identifiers
-
- wos:000232266300009
- scopus:26644473887
- ISSN
- 1943-2658
- language
- English
- LU publication?
- yes
- id
- 475f6178-9ea3-4de6-b104-e6c85b6c13f5 (old id 221379)
- date added to LUP
- 2016-04-01 11:47:08
- date last changed
- 2022-04-28 20:00:51
@article{475f6178-9ea3-4de6-b104-e6c85b6c13f5,
abstract = {{With a surface wave method to estimate shear-wave velocity (Vs) from dispersion curve(s) of known mode(s), accurate modal identification is obviously a crucial issue. In this regard, the dispersion imaging method is an essential processing tool as it can unfold the multi-modal nature of surface waves through direct wavetield transformations. When a combined dispersion curve of an extended frequency range is prepared from analyses of both passive and active surface waves attempting to increase the maximum depth of Vs estimation, the modal nature of the passive curve (as well as the active one) must be assessed although it has usually been considered the fundamental mode. We report two experimental survey cases performed at the same soil site, but at two different times, employing the passive and active versions of the multichannel analysis of surface waves (MASW) method for an increased investigation depth. In the earlier survey, the modal nature of the imaged dispersion trends from the passive (<20 Hz) and active (>20 Hz) data sets was identified as the fundamental mode, whereas it was confidently re-identified as the first higher mode from the later survey. Modal inspection with the dispersion image created by combining passive and active image data sets was the key to this confident analysis. The modal nature of the passive curve was identified from its context with active curves, whose confident analysis therefore had to come first. An active data set acquired with a small (<1.0 m) receiver spacing and an impact point located close to the receivers appears important for this purpose.}},
author = {{Park, C B and Miller, R D and Rydén, Nils and Xia, J and Ivanov, J}},
issn = {{1943-2658}},
language = {{eng}},
number = {{3}},
pages = {{323--334}},
publisher = {{ENVIRONMENTAL ENGINEERING GEOPHYSICAL SOCIETY}},
series = {{Journal of Environmental & Engineering Geophysics}},
title = {{Combined use of active and passive surface waves}},
volume = {{10}},
year = {{2005}},
}