Estimation of Subsurface Structure of Obama Plain Based on Microtremor Observation

• ITO Masaki

  Technical Chief, Technical Division, University of Fukui

• KOJIMA Keisuke

  Faculty of Engineering, University of Fukui

Bibliographic Information

Other Title

• 常時微動観測に基づく小浜平野の地盤構造の推定

Abstract

In this study, we conducted microtremor array observations and single-point-3-components observations to estimate the S-wave velocity structure of the Obama plain. Rayleigh wave phase velocities at each array site were calculated from the spatial autocorrelation method. The phase velocities at each site were inverted to a 1D S-wave profile using a genetic inversion. The subsurface structures down to the Tertiary bedrock were estimated as inversion problem based on the H/V spectra. The 1D S-wave velocity structures around the plain were interpolated into 3D structure by using Kriging techniques. The validity of the estimated structure from the microtremor observation was confirmed by comparing with the seismic prospecting and with the boring log data.

Journal

• Journal of Japan Association for Earthquake Engineering

  Journal of Japan Association for Earthquake Engineering 20 (1), 1_147-1_156, 2020

  JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING

Keywords

• Obama plain
• GIS
• Microtremor observation
• H/V-spectrum
• S-wave velocity structure

Details

• CRID: 1390565134824738688
• NII Article ID: 130007792979
• DOI: 10.5610/jaee.20.1_147
• ISSN: 18846246
• Web Site: https://www.jstage.jst.go.jp/article/jaee/20/1/20_1_147/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed