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Volume 60 Supplement 10

Special Issue: Special Section for the 2007 Noto Hanto Earthquake (2)

Temporal variations of crustal structure in the source region of the 2007 Noto Hanto Earthquake, central Japan, with passive image interferometry

Abstract

The passive image interferometry technique is applied to the continuous seismic waveform data obtained around the source region of the 2007 Noto Hanto Earthquake, central Japan. We computed the autocorrelation function (ACF) of band-pass filtered seismic noise portion recorded with each short-period seismometer at several seismic stations for 1 day each. In some stations, comparison of each 1-day ACF shows temporal evolutions of the ACF, which are interpreted as the change of seismic velocity structure in the volume considered. Sudden changes of ACF are detected to be associated with the occurrence of the main shock in one station of the four stations analyzed. Gradual changes of ACFs in the preceding 2 weeks of the main shock are also recognized in two stations, which would be of great importance for understanding the stress state before the occurrence of earthquakes.

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Correspondence to Shiro Ohmi.

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Ohmi, S., Hirahara, K., Wada, H. et al. Temporal variations of crustal structure in the source region of the 2007 Noto Hanto Earthquake, central Japan, with passive image interferometry. Earth Planet Sp 60, 1069–1074 (2008). https://doi.org/10.1186/BF03352871

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  • DOI: https://doi.org/10.1186/BF03352871

  • Noto Hanto Earthquake
  • seismic interferometry
  • back ground noise
  • autocorrelation function