Improvement of Estimation Accuracy of Sandflat Stratigraphy with Intermediate Soft Sublayer -Combination Use of MASW and Microtremor Array Measurements

• WATABE Yoichi

  Port and Airport Research Institute

• SASSA Shinji

  Port and Airport Research Institute

• YAMADA Fumihiko

  Kumamoto University

• HAYASHI Koichi

  Geometrics Inc.

Bibliographic Information

Other Title

• 中間軟弱層を含む干潟地盤の地層断面推定精度の向上－MASWと微動アレイ探査の併用

Abstract

The Okoshiki Coast in Uto City, Kumamoto Prefecture, Japan, is apparently a typical sandflat with rhythmical variation of multi-bar-trough structure. Multi-channel analysis of surface waves (MASW) was applied to this sandflat; however, the dispersion curves corresponding to the deeper portion could not be obtained by MASW because of a soft intermediate clayey sublayer. The Rayleigh waves generated in MASW survey propagate in the subsoils; however, they significantly attenuate in soft clayey sublayers. In this study, microtremor array measurements (MAM) were additionally applied at some points along the survey array for MASW to improve the accuracy of MASW results at deeper portion. Combination use of MASW and MAM is a useful technique to evaluate tidalfalt stratigraphy with soft sublayers.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 67 (2), I_1361-I_1365, 2011

  Japan Society of Civil Engineers

Keywords

• tidalflats
• shear wave velocity
• Multi-channel Analysis of surface waves
• microtremor array measurements

Details

• CRID: 1390282680297564672
• NII Article ID: 130004550440
• DOI: 10.2208/kaigan.67.i_1361
• ISSN: 18838944
• ISSN: 18842399
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed