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- W2318483907 abstract "The A.D. 2011 Tohoku-Oki M w 9 earthquake ruptured the megathrustup to the Japan Trench with a large displacement and causeda catastrophic tsunami. This study is the first to use short-lived radioisotopes,including those emitted by the damaged nuclear reactors atthe Fukushima Daiichi nuclear power plant (Japan), to document theremobilization of the upper few centimeters of sediment as a highlysignificant process triggered by the earthquake and its aftershocks.Targeting the post-earthquake environment allowed characterizationof the sedimentary signature of this event for a better understandingof paleoearthquakes in Japan and other tectonically active boundaryareas. The results stem from 23 piston cores recovered by the 2013expedition NT13-19 of the Japan Agency for Marine-Earth Scienceand Technology. We document submarine homogeneous muddy flowdeposits that were triggered by ground motion in 2011. They are highlyenriched with excess (xs) xs 210 Pb, requiring only centimeters-deepsediment remobilization over large areas of the seafloor. Some contain 134 Cs and 137 Cs radioisotopes derived from the Fukushima nuclearreactors, indicating that sedimentation persisted for at least 30 daysafter the main shock. We found these deposits at all sampling sites inan ∼5000 km 2 area of the seafloor in 4000–6000 m of water depth. Thestudy area extends for ∼260 km parallel to the strike of the trench.The thickness of this Tohoku layer (3–200 cm) increases toward thezone of maximum megathrust slip, where deposits are thickest. Theseresults demonstrate that the shaking of the seafloor above large megathrustruptures near the trench remobilized surficial unconsolidatedsediment for hundreds of kilometers. The characteristics of thesedeposits may typify deposits resulting from large fault slips like thatof the Tohoku-Oki earthquake, but also other earthquake deposits,contributing to their identification in the sedimentary record globally." @default.
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- W2318483907 date "2016-04-08" @default.
- W2318483907 modified "2023-10-18" @default.
- W2318483907 title "Remobilization of surficial slope sediment triggered by the A.D. 2011 M<sub>w</sub>9 Tohoku-Oki earthquake and tsunami along the Japan Trench" @default.
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- W2318483907 doi "https://doi.org/10.1130/g37650.1" @default.
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