Method to estimate equivalent natural period with micro-tremor measurements

Munemasa Tokunaga*, Masamichi Sogabe, Fumiaki Uehan, Hiroyuki Tanimura, Yoshitaka Murono, Kiyoshi Ono

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The object of this paper is to propose a method to estimate the equivalent natural period with micro-tremor measurements on the basis of the correlation between the natural frequency and the yield frequency. A method, combining the Eigensystem Realization Algorithm and some empirical hypotheses of vibration modes, was proposed for identifying the first natural vibration modes of structures. A ratio of the yield frequency to the natural frequency was mostly a certain constant value and the average value of the ratio depends on the type of structures. This paper proposes a simple procedure for estimating the yield frequency with micro-tremor measurements.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalQuarterly Report of RTRI (Railway Technical Research Institute) (Japan)
Issue number1
Publication statusPublished - 2012 Feb
Externally publishedYes


  • Eigensystem Realization Algorithm
  • Equivalent natural period
  • Micro-tremor measurement
  • Modal identification
  • Natural period
  • Nonlinear analysis

ASJC Scopus subject areas

  • Mechanical Engineering


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