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2016 | OriginalPaper | Buchkapitel

8. Characteristics of Shoreline Retreat Due to the 2011 Tohoku Earthquake and Tsunami and Its Recovery After Three Years

verfasst von : Keiko Udo, Kaoru Tojo, Yuriko Takeda, Hitoshi Tanaka, Akira Mano

Erschienen in: Tsunamis and Earthquakes in Coastal Environments

Verlag: Springer International Publishing

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Abstract

We investigate the characteristics of shoreline retreat due to the 2011 Tohoku Earthquake and Tsunami and its recovery after 3 years over a wide area from Aomori Prefecture to Ibaraki Prefecture by analyzing the data of crustal deformation, tsunami height, and aerial photographs. There were no significant retreats where the seawall remained unbreached and where river mouths were distantly located regardless of the tsunami overflow depth over the seawall, indicating that the seawall condition during tsunami strikes is one of the most important factors that prevent serious shoreline retreat. After 3 years from the event, recovery of the eroded Ria coasts has been insignificant compared to the plain coasts. The key natural factors for the recovery are the upward crustal deformation after the earthquake and sediment supply from adjacent coasts or rivers after the tsunami; however, these could not be expected at the Ria coasts at least in near future.

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Titel: Characteristics of Shoreline Retreat Due to the 2011 Tohoku Earthquake and Tsunami and Its Recovery After Three Years
verfasst von: Keiko Udo
Kaoru Tojo
Yuriko Takeda
Hitoshi Tanaka
Akira Mano
Verlag: Springer International Publishing
Buch: Tsunamis and Earthquakes in Coastal Environments
Print ISBN: 978-3-319-28526-9

Electronic ISBN: 978-3-319-28528-3

Copyright-Jahr: 2016
DOI: https://doi.org/10.1007/978-3-319-28528-3_8