Refinement and application of an estimation procedure for site natural periods using microtremor

Tatsuo Ohmachi, Katsuaki Konno, Tatsuya Endoh, Takumi Toshinawa

Research output: Contribution to journalArticle

16 Citations (Scopus)


Based on recent studies suggesting that Rayleigh waves are observable in microtremor ground motions, an improved procedure is proposed to estimate a natural period of a site using amplitude ratios between horizontal and vertical motion of the microtremors. The procedure is to make the best use of not only peaks but also troughs in a spectral amplitude ratio. Using microtremor data measured at all junior high schools in 23 wards of Tokyo, the proposed procedure is applied to a period-mapping of the area and compared with an existing map to a satisfactory level of accuracy, demonstrating its practicality.

Original languageEnglish
Pages (from-to)251-260
Number of pages10
JournalDoboku Gakkai Rombun-Hokokushu/Proceedings of the Japan Society of Civil Engineers
Issue number489 pt 1-27
Publication statusPublished - 1994 Jan 1


ASJC Scopus subject areas

  • Engineering(all)

Cite this