Precise aftershock distribution of the 2004 Mid-Niigata prefecture earthquake-Implication for a very weak region in the lower crust

Yoshihisa Iio, Takuo Shibutani, Satoshi Matsumoto, Hiroshi Katao, Takeshi Matsushima, Shiro Ohmi, Fumiaki Takeuchi, Kenji Uehira, Kinya Nishigami, Masatoshi Miyazawa, Bogdan Enescu, Issei Hirose, Yasuyuki Kano, Yuhki Kohno, Ken'ichi Tatsumi, Tomotake Ueno, Hiroo Wada, Yohei Yukutake

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

The 2004 Mid-Niigata prefecture Earthquake (Mjma 6.8) occurred in the region of large strain rates (>0.1 ppm/y contraction) in the intraplate region in Japan. The mainshock was followed by four major aftershocks with Mjma >= 6.0. The hypocenters of the mainshock and two large aftershocks that occurred in the central part of the aftershock region were located near the lower limit of the earthquake distribution, while hypocenters of the other two aftershocks near both ends, are located near its upper limit. Furthermore, the fault planes of the latter two aftershocks were confined within the upper half of the upper crust. Also, the lower limit of the aftershock distribution is deepest in the central part and becomes shallower toward the NNE and SSW ends. These data can be explained by the hypothesis that a localized stress concentration occurred near the bottom of the seismogenic region only in the central part. The stress concentration may be generated by the deformation in the very weak region of low strength in the lower crust beneath the central part of the aftershock region.

本文言語英語
ページ(範囲)345-352
ページ数8
ジャーナルPhysics of the Earth and Planetary Interiors
172
3-4
DOI
出版ステータス出版済み - 2 1 2009

All Science Journal Classification (ASJC) codes

  • 天文学と天体物理学
  • 地球物理学
  • 物理学および天文学(その他)
  • 宇宙惑星科学

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