2009年2月
Coseismic Change and Recovery of Scattering Environment in the Crust after the 1995 Hyogo-ken Nanbu Earthquake, Japan
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
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- ,
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- 巻
- 99
- 号
- 1
- 開始ページ
- 435
- 終了ページ
- 440
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1785/0120080012
- 出版者・発行元
- SEISMOLOGICAL SOC AMER
We observe a unique temporal variation in crustal heterogeneity from the analysis of coda Q(-1) for 14 years in the Tamba region, northeast to the rupture zone of the 1995 Hyogo-ken Nanbu earthquake (M-JMA 7.3) in southwest Japan. The values of Q(C)(-1) at lower frequencies (1.5-4.0 Hz) that increased coseismically due to the static stress change decreased back to the preevent values in about two years. No such variations are found at higher frequencies (5.0-24.0 Hz). We confirm that no tectonic events that cause a significant stress change occurred during the recovery period. The time required for the recovery of the scattering environment observed here, such as the number density of cracks and cracks opened by the stress change, is consistent with those of previous studies focused on the brittle shallower crust. This suggests a possibility that a similar mechanism of the recovery operates in both the brittle and the ductile parts of the crust.
- リンク情報
- ID情報
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- DOI : 10.1785/0120080012
- ISSN : 0037-1106
- eISSN : 1943-3573
- Web of Science ID : WOS:000266181100037