Hadal disturbance in the Japan Trench induced by the 2011 Tokohu-Oki earthquake

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書誌事項

タイトル別名
  • Hadal disturbance in the Japan Trench induced by the 2011 Tohoku-Oki earthquake
  • Hadal disturbance in the Japan Trench induced by the 2011 Tohoku—Oki Earthquake
  • Hadal disturbance in the Japan Trench as induced by the 2011 Tohoku-Oki Earthquake
公開日
2013
資源種別
journal article
DOI
  • 10.1038/srep01915
公開者
Nature Publishing Group

説明

In situ video observations and sediment core samplings were performed at two hadal sites in the Japan Trench on July, 2011, four months after the Tohoku-Oki earthquake. Video recordings documented dense nepheloid layers extending ~30-50 m above the sea bed. At the trench axis, benthic macrofauna was absent and dead organisms along with turbid downslope current were observed. The top 31 cm of sediment in the trench axis revealed three recent depositions events characterized by elevated (137)Cs levels and alternating sediment densities. At 4.9 km seaward from the trench axis, little deposition was observed but the surface sediment contained (134)Cs from the Fukushima Dai-ichi nuclear disaster. We argue that diatom blooms observed by remote sensing facilitated rapid deposition of (134)Cs to hadal environment and the aftershocks induced successive sediment disturbances and maintained dense nepheloid layers in the trench even four months after the mainshock.

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