Surface wave analysis for studying elastic properties of glacier bed sediments

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

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

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.

本文言語英語
ホスト出版物のタイトルSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011
出版社Society of Exploration Geophysicists
ページ1358-1362
ページ数5
ISBN(印刷版)9781618391841
出版ステータス出版済み - 2011
外部発表はい
イベントSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 - San Antonio, 米国
継続期間: 9 18 20119 23 2011

出版物シリーズ

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

その他

その他Society of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011
国/地域米国
CitySan Antonio
Period9/18/119/23/11

All Science Journal Classification (ASJC) codes

  • 地球物理学

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