Depth variations in seismic velocity in the subducting crust: Evidence for fluid-related embrittlement for intermediate-depth earthquakes

Takahiro Shiina, Junichi Nakajima, Toru Matsuzawa, Genti Toyokuni, Saeko Kita

研究成果: Article査読

15 被引用数 (Scopus)

抄録

We investigated seismic wave velocity in the subducting crust of the Pacific slab beneath eastern Hokkaido, northern Japan. To detect depth-dependent properties of the seismic velocities in the crust, we analyzed guided waves that propagate in the crust and estimated P wave velocity (Vp) of 6.5–7.5 km/s and S wave velocity (Vs) of 3.6–4.2 km/s at depths of 50–100 km. The results show that the obtained Vp and Vs are 10–15% lower than those expected for the fully hydrated mid-ocean ridge basalt, suggesting the existence of aqueous fluids by ~1 vol % in the crust at this depth range. Our observations suggest that overpressurized fluids channeled in the subducting crust plays as a dominant factor for facilitating the genesis of crustal earthquakes at intermediate depths.

本文言語English
ページ(範囲)810-817
ページ数8
ジャーナルGeophysical Research Letters
44
2
DOI
出版ステータスPublished - 2017 1 28

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)

フィンガープリント

「Depth variations in seismic velocity in the subducting crust: Evidence for fluid-related embrittlement for intermediate-depth earthquakes」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル