Surface wave analysis for studying elastic properties of glacier bed sediments

Takeshi Tsuji, Tor Arne Johansen, Bent Ole Ruud, Tatsunori Ikeda, Toshifumi Matsuoka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

To reveal if glacier bed sediments are unfrozen, we apply multi-channel analysis of surface waves MASW on seismic data acquired across a glacier at the southern central Spitsbergen in the Norwegian Arctic. The S-wave velocity varies significantly with the degree of freezing of the pore fluids. We clearly observe the offset of the dispersion curves at the transition of predominant modes. These higher modes may indicate a velocity reversal beneath the glacier or interface between glacier and sediment. Based on simulation studies, we find that the offset observed on the dispersion curve seems to be related to the glacier thickness when the velocity structure beneath the glacier is similar. Therefore, we can roughly estimate the geometry of the surface of the sediment sharp velocity contrast only from the transition of predominant mode on the dispersion curve. We then estimate the S-wave velocity distribution via Genetic Algorithm GA inversion, using information of ice thickness derived from Ground Penetrating Rader GPR data. The estimated S-wave velocity structure clearly represents the velocity reversal beneath the glacier.

Original languageEnglish
Pages (from-to)1358-1362
Number of pages5
JournalSEG Technical Program Expanded Abstracts
Volume30
Issue number1
DOIs
Publication statusPublished - Jan 1 2011

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Glaciers
glaciers
elastic property
Surface waves
surface wave
surface waves
beds
Sediments
sediments
glacier
elastic properties
sediment
S waves
wave velocity
S-wave
velocity structure
curves
Spitsbergen (Norway)
Ground penetrating radar systems
ice thickness

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geophysics

Cite this

Surface wave analysis for studying elastic properties of glacier bed sediments. / Tsuji, Takeshi; Johansen, Tor Arne; Ruud, Bent Ole; Ikeda, Tatsunori; Matsuoka, Toshifumi.

In: SEG Technical Program Expanded Abstracts, Vol. 30, No. 1, 01.01.2011, p. 1358-1362.

Research output: Contribution to journalArticle

Tsuji, Takeshi ; Johansen, Tor Arne ; Ruud, Bent Ole ; Ikeda, Tatsunori ; Matsuoka, Toshifumi. / Surface wave analysis for studying elastic properties of glacier bed sediments. In: SEG Technical Program Expanded Abstracts. 2011 ; Vol. 30, No. 1. pp. 1358-1362.
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