Foraminiferal evidence of submarine sediment transport and deposition by backwash during the 2004 Indian Ocean tsunami

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概要

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• Micropaleontological analysis of nearshore to offshore sediments recovered from the southwestern coast of Thailand was performed to clarify the submarine processes of sediment transport and deposition during the 2004 Indian Ocean tsunami. The distribution pattern of benthic foraminifers showed seaward migration after the tsunami event. Agglutinated foraminifers, which are characteristic of an intertidal brackish environment, were identified in the post-tsunami samples from foreshore to offshore zones. These suggest that sediments originally distributed in foreshore to nearshore zones were transported offshore due to the tsunami backwash. On the other hand, the distribution pattern of planktonic and benthic species living in offshore zones showed slight evidence of landward migration by the tsunami. This suggests that landward redistribution of sediments by the tsunami run-up did not occur in the offshore seafloor of the study area. Our results and a review of previous studies provide an interpretation of submarine sedimentation by tsunamis. It is possible that tsunami backwashes induce sediment flows that transport a large amount of coastal materials seaward. Thus, traces of paleotsunami backwashes can be identified in offshore sedimentary environments as the accumulation of allochthonous materials. This can be recognized as changes in benthic foraminiferal assemblages. © 2009 The Authors Journal compilation © 2009 Blackwell Publishing Asia Pty Ltd.

• Blackwell Publishingの論文
• 2009-09-01

著者

• Goto Kazuhisa

  Disaster Control Research Center Graduate School Of Engineering Tohoku University

• SUGAWARA DAISUKE

  Institute of Geology and Paleontology, Graduate School of Science, Tohoku University

• MINOURA KOJI

  Institute of Geology and Paleontology, Graduate School of Science, Tohoku University

• NEMOTO NAOKI

  Graduate School of Science and Technology, Hirosaki University

• TSUKAWAKI SHINJI

  Division of Eco-Technology, Institute of Nature and Environmental Technology, Kanazawa University

• IMAMURA FUMIHIKO

  Disaster Control Research Center, Graduate School of Engineering, Tohoku University

• Tsukawaki Shinji

  Division Of Eco-technology Institute Of Nature And Environmental Technology Kanazawa University

• Minoura Koji

  Institute Of Geology And Paleontology Graduate School Of Science Tohoku University

• Nemoto Naoki

  Graduate School Of Science And Technology Hirosaki University

• Imamura Fumihiko

  Disaster Control Research Center Graduate School Of Engineering Tohoku University

• Sugawara Daisuke

  Institute Of Geology And Paleontology Graduate School Of Science Tohoku University

• Imamura Fumihiko

  Disaster Control Research Center Faculty Of Engineering Tokyo University

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• PREFACE
• Tsunami run-up heights of the 2003 Tokachi-oki earthquake

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