Local Effects on Strain Seismograms at Matsushiro Seismological Observatory - 2. Rayleigh Waves

  • Author(s): Taishi Okamoto, Yutaka Ikegami, and Kazuya Kokubo
  • DOI: 10.3319/TAO.2007.18.5.901(T)
  • Keywords: Strain seismogram Rayleigh wave Phase velocity
  • Citation: Okamoto, T., Y. Ikegami, and K. Kokubo, 2007: Local effects on strain seismograms at Matsushiro Seismological Observatory - 2. Rayleigh waves. Terr. Atmos. Ocean. Sci., 18, 901-921, doi: 10.3319/TAO.2007.18.5.901(T)

We evaluate local effects on strain seismograms for a Rayleigh wave observed at Matsushiro Seismological Observatory, Japan Meteorological Agency, central Japan, by applying a method proposed in a previous report (Okamoto et al. 2007). The method involves examination of polarization angles, local phase velocity, and accuracy of velocity seismograms. The results are as follows: 1) Polarization angles of observed strain seismograms agree with expected ones from those of velocity seismograms also observed at Matsushiro; 2) Local phase velocity estimated by comparison between strain and velocity seismograms is 54% larger than the theoretical value calculated from the PREM velocity model; 3) Velocity spectra observed at Matsushiro have almost the same amplitude as an average of those at F-net observation stations near Matsushiro. These results indicate that both EW and NS component strain seismograms observed at Matsushiro have been reduced by 35% in amplitude for a Rayleigh wave due to local heterogeneity. The local effects on a Rayleigh wave are quite different from that on a Love wave obtained in the previous report.

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