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: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011
PublisherSociety of Exploration Geophysicists
Pages1358-1362
Number of pages5
ISBN (Print)9781618391841
Publication statusPublished - Jan 1 2011
Externally publishedYes
EventSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 - San Antonio, United States
Duration: Sep 18 2011Sep 23 2011

Publication series

NameSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011

Other

OtherSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011
CountryUnited States
CitySan Antonio
Period9/18/119/23/11

All Science Journal Classification (ASJC) codes

  • Geophysics

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