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A mobile multi-depth borehole sensor set-up to study the surface-to-base seismic transfer functions

Obando, Edwin LU ; Rydén, Nils LU and Ulriksen, Peter LU (2011) In Engineering Geology 123(3). p.246-258
Abstract
The best method to evaluate the seismic site response is by means of borehole vertical arrays that use earthquake records from different depths. In this paper we introduce the implementation of a single borehole sensor system (synchronized to a sensor on the surface) that is fixed at variable depths within a single well. This system is used for recording small amplitude earthquake signals at variable stiffness conditions in depth to compute empirical borehole transfer functions. The computed average empirical borehole transfer functions allow the estimation of an S-wave velocity model that is constrained using the frequency peak observed in the H/V ratio curve. Pairs of surface and borehole earthquake records were obtained with the... (More)
The best method to evaluate the seismic site response is by means of borehole vertical arrays that use earthquake records from different depths. In this paper we introduce the implementation of a single borehole sensor system (synchronized to a sensor on the surface) that is fixed at variable depths within a single well. This system is used for recording small amplitude earthquake signals at variable stiffness conditions in depth to compute empirical borehole transfer functions. The computed average empirical borehole transfer functions allow the estimation of an S-wave velocity model that is constrained using the frequency peak observed in the H/V ratio curve. Pairs of surface and borehole earthquake records were obtained with the borehole sensor placed at -10, -20, -50, and 100 m depth in a test site in Managua, Nicaragua. The average velocity of the final model down to -100 m appeared to be in good agreement with the average velocity computed via cross-correlation using the surface and borehole signals. Likewise, an inverted MASW profile and FIN ratio at the same site agree with the S-wave velocity model obtained. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Vertical arrays, Borehole transfer function, Site response, Site, amplification, Site effect, MASW
in
Engineering Geology
volume
123
issue
3
pages
246 - 258
publisher
Elsevier
external identifiers
  • wos:000297182200010
  • scopus:80054711172
ISSN
0013-7952
DOI
10.1016/j.enggeo.2011.09.001
language
English
LU publication?
yes
id
a027aa19-9fce-4e0b-a6c6-fd63f046f5a5 (old id 2243162)
date added to LUP
2011-12-22 12:56:04
date last changed
2017-01-01 05:59:30
@article{a027aa19-9fce-4e0b-a6c6-fd63f046f5a5,
  abstract     = {The best method to evaluate the seismic site response is by means of borehole vertical arrays that use earthquake records from different depths. In this paper we introduce the implementation of a single borehole sensor system (synchronized to a sensor on the surface) that is fixed at variable depths within a single well. This system is used for recording small amplitude earthquake signals at variable stiffness conditions in depth to compute empirical borehole transfer functions. The computed average empirical borehole transfer functions allow the estimation of an S-wave velocity model that is constrained using the frequency peak observed in the H/V ratio curve. Pairs of surface and borehole earthquake records were obtained with the borehole sensor placed at -10, -20, -50, and 100 m depth in a test site in Managua, Nicaragua. The average velocity of the final model down to -100 m appeared to be in good agreement with the average velocity computed via cross-correlation using the surface and borehole signals. Likewise, an inverted MASW profile and FIN ratio at the same site agree with the S-wave velocity model obtained. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Obando, Edwin and Rydén, Nils and Ulriksen, Peter},
  issn         = {0013-7952},
  keyword      = {Vertical arrays,Borehole transfer function,Site response,Site,amplification,Site effect,MASW},
  language     = {eng},
  number       = {3},
  pages        = {246--258},
  publisher    = {Elsevier},
  series       = {Engineering Geology},
  title        = {A mobile multi-depth borehole sensor set-up to study the surface-to-base seismic transfer functions},
  url          = {http://dx.doi.org/10.1016/j.enggeo.2011.09.001},
  volume       = {123},
  year         = {2011},
}