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Disturbance of deep-sea environments induced by the M9.0 Tohoku Earthquake
Kawagucci, S.; Yoshida, Y.T.; Nogushi, T.; Honda, M.C.; Uchida, H.; Ishibashi, H.; Nakagawa, F.; Tsunogai, U.; Okamura, K.; Takaki, Y.; Nunoura, T.; Miyazaki, J.; Hirai, M.; Lin, W.; Kitazato, H.; Takai, K. (2012). Disturbance of deep-sea environments induced by the M9.0 Tohoku Earthquake. NPG Scientific Reports 2(270): 7 pp. dx.doi.org/10.1038/srep00270
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322, more
Peer reviewed article  

Available in Authors 

Keyword
    Marine

Authors  Top 
  • Kawagucci, S.
  • Yoshida, Y.T.
  • Nogushi, T.
  • Honda, M.C.
  • Uchida, H.
  • Ishibashi, H.
  • Nakagawa, F.
  • Tsunogai, U.
  • Okamura, K.
  • Takaki, Y.
  • Nunoura, T.
  • Miyazaki, J.
  • Hirai, M.
  • Lin, W.
  • Kitazato, H.
  • Takai, K.

Abstract
    The impacts of the M9.0 Tohoku Earthquake on deep-sea environment were investigated 36 and 98 days after the event. The light transmission anomaly in the deep-sea water after 36 days became atypically greater (~35%) and more extensive (thickness ~1500 m) near the trench axis owing to the turbulent diffusion of fresh seafloor sediment, coordinated with potential seafloor displacement. In addition to the chemical influx associated with sediment diffusion, an influx of 13C-enriched methane from the deep sub-seafloor reservoirs was estimated. This isotopically unusual methane influx was possibly triggered by the earthquake and its aftershocks that subsequently induced changes in the sub-seafloor hydrogeologic structures. The whole prokaryotic biomass and the development of specific phylotypes in the deep-sea microbial communities could rise and fall at 36 and 98 days, respectively, after the event. We may capture the snap shots of post-earthquake disturbance in deep-sea chemistry and microbial community responses.

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