EFFECTS OF IRREGULAR GROUND ON VERTICAL MOTION AMPLIFICATION DURING EARTHQUAKES

• OHMACHI Tatsuo

  JAPAN SOCIETY OF CIVIL ENGINEERS

• IIYAMA Kahori

  JAPAN SOCIETY OF CIVIL ENGINEERS

Bibliographic Information

Other Title

• 地震硯測に基づく不整形地盤による上下動増幅要因の検討
• 地震観測に基づく不整形地盤による上下動増幅要因の検討
• ジシン カンソク ニ モトヅク フセイケイ ジバン ニ ヨル ジョウゲドウ ゾウフク ヨウイン ノ ケントウ

Abstract

For years, earthquake ground motion has been observed at 6 stations in Kamakura city, Japan. Among them, two stations of NMD and ONR have been found to show larger vertical motion. Especially at NMD, a maximum acceleration ratio between vertical and horizontal motions is sometimes exceeds 1, with a constant predominant period of about 0.25sec for both vertical and horizontal motions. A 2-D BEM is applied to characterize ground motion at both stations, with a result showing that steep slopes of bed rocks under the surface layers play important but different roles for both cases.

Journal

• Doboku Gakkai Ronbunshu

  Doboku Gakkai Ronbunshu 2000 (654), 183-194, 2000-07-21

  Japan Society of Civil Engineers

Keywords

• earthquake observation
• vertical ground motion
• irregular ground
• 2-D BEM

Details

• CRID: 1390001205308858240
• NII Article ID: 10004543937
• NII Book ID: AN10014020
• DOI: 10.2208/jscej.2000.654_183
• ISSN: 18827187
• ISSN: 02897806
• NDL BIB ID: 5468147
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5468147
• Web Site: https://www.jstage.jst.go.jp/article/jscej1984/2000/654/2000_654_183/_pdf
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed