Temporal change of seismic structure around Iwate volcano inferred from waveform correlation analysis of similar earthquakes

Teruo Yamawaki, Takeshi Nishimura, Hiroyuki Hamaguchi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We investigate the temporal change of crustal structure around Iwate volcano, northeastern Japan, using calculations of the cross-correlation coefficients of P- and S-waves of pairs of similar earthquakes that occurred between 1995-2002 at the subducting Pacific Plate boundary. While large coefficients are observed at most stations throughout the period, two stations located on the southwestern slope of Iwate volcano exhibit small S-wave coefficients. The coefficients at these two stations decreased remarkably from 1998, corresponding to a period of significant volcanic activity and an M6.1 earthquake. Since 2000, the coefficients have recovered gradually, suggesting their correlation with the activity of Iwate volcano. The coefficients of P-waves at these stations are large compared to those of S-waves, suggesting that temporal change in the crustal structure beneath these stations occurred in elastic properties to which S-waves are sensitive, such as rigidity, related to magmatic and/or seismic activity in and around the volcano.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume31
Issue number24
DOIs
Publication statusPublished - 2004 Dec 28

Keywords

  • 0935 Exploration geophysics: Seismic methods (3025)
  • 7280 Seismology: Volcano seismology (8419)
  • 8015 Structural geology: Local crustal structure

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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