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| Titel |
Recognizing seiche and tsunami effects in lake sediments |
| VerfasserIn |
Shmuel Marco, Ian G. Alsop, Oded Katz, Yehoshua Dray |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090178
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| Publikation (Nr.) |
 EGU/EGU2014-4398.pdf |
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| Zusammenfassung |
| The lacustrine 70-15-ka Lisan Formation outcropping around the Dead Sea contains superb examples of slump folds formed in water depths of <100 m. New structural data from individual horizons demonstrate that several of these gravity-driven slumps are coaxially refolded and reworked by folds and thrusts verging both back up and then down the palaeoslope. The uppermost folds are often truncated. A progressive increase in reworking and shearing is developed up through the folded sediment, culminating in an upward-finning breccia layer that is capped by a thin, typically graded horizon of undeformed fine-grained clasts. We interpret this sequence as a seiche-related deformation. Based on the similarity of the structures in the Lisan Formation and on additional supporting observations we interpret zigzag-shaped sand injections in artificial lake deposits on the Eastern Mediterranean shore as evidence for a tsunami, possibly associated with the earthquake of 25 November 1759. If this interpretation is correct it supports the hypothesis that onshore Dead Sea Fault earthquakes can trigger tsunamis in the Mediterranean. |
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