An analysis of split shear waves observed above crustal and uppermost mantle earthquakes beneath Shikoku, Japan: implications in effective depth extent of seismic anisotropy

S. Kaneshima, M. Ando

研究成果: Contribution to journalArticle査読

28 被引用数 (Scopus)

抄録

Shear wave splitting has been detected in three-component seismograms from a number of small earthquakes taking place either within the upper crust or the uppermost mantle beneath the Shikoku area, Japan. The faster shear wave polarizations at the stations in the central part of Shikoku and the pattern of travel time differences between split shear waves are successfully explained in terms of crustal anisotropy generated by vertical alignment of stress-induced microcracks. The difference in polarization directions suggests that the tectonic stress state beneath the southern Shikoku region is significantly different from that beneath the central part of Shikoku. A quantitative analysis of travel time differences between split shear waves suggests that the presence of seismic anisotropy which causes the observed shear wave splitting is limited to the upper 10 or 15 km of the crust. -from Authors

本文言語英語
ページ(範囲)14,077-14,092
ジャーナルJournal of Geophysical Research
94
B10
DOI
出版ステータス出版済み - 1 1 1989
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 林業
  • 海洋学
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 古生物学

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