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| Titel |
Preliminary modeling of turbidity currents associated with the 2011 Tohoku-oki Earthquake |
| VerfasserIn |
Arata Kioka, Michael Strasser, Jasper Moernaut, Tobias Schwestermann, Ken Ikehara, Toshiya Kanamatsu, Cecilia M. McHugh |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147733
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| Publikation (Nr.) |
 EGU/EGU2017-11937.pdf |
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| Zusammenfassung |
| The 2011 Tohoku-oki earthquake generated among the largest volume of sediment
transportation associated with coseismic shaking, tsunamis, and submarine landslides.
Several recent studies of sediment cores, and instrumental observations revealed that the 2011
earthquake mobilized sediments to transport along the slope and over to the Japan Trench
through single or multi-flow turbidity currents. Yet, source location and flow pathways of
turbidity currents associated with the 2011 earthquake, and the resulting spatial
distribution of deposit thickness remain unknown. Here we model three-dimensional
depth-averaged turbidity currents offshore Tohoku area, to investigate possible scenarios of
source location, flow size, and pathways of turbidity currents generated by the 2011
earthquake. Within the studied model scheme, the model is theoretically hampered to
produce reliable results because of large uncertainties in parameters including seabed
conditions and flow properties. In our modelling, sediment cores and subbottom profiles
acquired from research cruises after the 2011 earthquake (e.g., R/V Sonne SO251A),
and previous results are used to constrain most of the parameters. We also test a
sensitivity of the parameters in order to examine how the sediment dynamics in
Japan Trench changes with different properties of the flow. Our scheme also helps
further our understanding of turbidite system produced by old giant earthquakes. |
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