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Sci Rep. 2014 Dec 17;4:7517. doi: 10.1038/srep07517.

Unexpected biotic resilience on the Japanese seafloor caused by the 2011 Tōhoku-Oki tsunami.

Author information

1
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan.
2
1] CNRS UMR 6112 LPG-BIAF, Recent and Fossil Bio-Indicators, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France [2] Univ. of Bordeaux, CNRS, Environnements et Paléo-environnements Océaniques et Continentaux, UMR 5805, F33615 Pessac, France [3] Ifremer EDROME, Département Géosciences Marines, Laboratoire Environnements sédimentaires, Centre de Brest, Technopôle de Brest-Iroise, BP 70, F-29280 Plouzané, France.
3
Univ. of Bordeaux, CNRS, Environnements et Paléo-environnements Océaniques et Continentaux, UMR 5805, F33615 Pessac, France.
4
CNRS and Univ. Perpignan, CEntre de Formation et de Recherche sur les Environnements Méditerranéens, UMR 5110 CNRS, F-66860 Perpignan Cedex, France.
5
Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8511, Japan.
6
1] Department of Earth Sciences - Geochemistry, Faculty of Geosciences, Utrecht University, P.O. Box 80.021, 3508 TA Utrecht, The Netherlands [2] Department of Environmental Sciences, P.O. Box 65 (Viikinkaari 1), 00014 University of Helsinki, Finland.
7
Geological Survey of Japan, AIST, Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan.
8
CEREGE, Aix-Marseille Univ, CNRS UMR 7330, 13545 Aix-en-Provence Cedex 4, France.
9
Center for Advanced Marine Core Research, Kochi University, 200 Monobe Otsu, Nankoku, Kochi, 783-8502 Japan.
10
Royal Netherlands Institute for Sea Research, Landsdiep 4, 1797 SZ 't Horntje, The Netherlands.
11
1] Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan [2] Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8511, Japan.
12
CNRS UMR 6112 LPG-BIAF, Recent and Fossil Bio-Indicators, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France.
13
1] Department of Earth Sciences - Geochemistry, Faculty of Geosciences, Utrecht University, P.O. Box 80.021, 3508 TA Utrecht, The Netherlands [2] Royal Netherlands Institute for Sea Research, Landsdiep 4, 1797 SZ 't Horntje, The Netherlands.

Abstract

On March 11(th), 2011 the Mw 9.0 2011 Tōhoku-Oki earthquake resulted in a tsunami which caused major devastation in coastal areas. Along the Japanese NE coast, tsunami waves reached maximum run-ups of 40 m, and travelled kilometers inland. Whereas devastation was clearly visible on land, underwater impact is much more difficult to assess. Here, we report unexpected results obtained during a research cruise targeting the seafloor off Shimokita (NE Japan), shortly (five months) after the disaster. The geography of the studied area is characterized by smooth coastline and a gradually descending shelf slope. Although high-energy tsunami waves caused major sediment reworking in shallow-water environments, investigated shelf ecosystems were characterized by surprisingly high benthic diversity and showed no evidence of mass mortality. Conversely, just beyond the shelf break, the benthic ecosystem was dominated by a low-diversity, opportunistic fauna indicating ongoing colonization of massive sand-bed deposits.

PMID:
25515588
PMCID:
PMC4268652
DOI:
10.1038/srep07517
[Indexed for MEDLINE]
Free PMC Article

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