Shear wave polarization anisotropy in and around the focal region of the 2005 West off Fukuoka Prefecture earthquake

Atsushi Watanabe, Satoshi Matsumoto, Takeshi Matsushima, Kenji Uehira, Norimichi Matsuwo, Hiroshi Shimizu

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

Crustal shear wave polarization anisotropy is caused by the alignment of vertical microcracks. Leading shear wave polarization directions (LSPDs) are presumed to be consistent with the maximum horizontal compressional axis in many cases. We analyzed shear wave polarization anisotropy in and around the focal region of the 2005 West off Fukuoka Prefecture earthquake. Almost all of the LSPDs are oriented in the E-W direction, which is consistent with the maximum horizontal compressional axis inferred from the mechanism of the main shock. These E-to W-oriented LSPDs are caused by the alignment of stress-induced microcracks. Crack densities at most stations are estimated to be 0.02. Little spacial stress variation around focal region is suspected.

本文言語英語
ページ(範囲)1633-1636
ページ数4
ジャーナルearth, planets and space
58
12
DOI
出版ステータス出版済み - 2006

All Science Journal Classification (ASJC) codes

  • 地質学
  • 宇宙惑星科学

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