Seismogenic structures in Quaternary lacustrine deposits of Lake Van (eastern Turkey)
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Date
2014-06-30
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Publisher
Bogucki Wydawnictwo Naukowe
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Abstract
Soft-sediment deformation structures formed by liquefaction and/or fluidisation of unconsolidated sediments due to
seismic shocks are frequent in the Quaternary sandy, silty and clayey deposits of Lake Van. They are present in both
marginal and deep lacustrine facies. Their morphology and interpreted genesis imply that they should be considered as
fluid-escape structures (dish and pillar structures, flame structures and sand volcanoes), contorted structures (simple
and complex convolutions and ball-and-pillow structures) and other structures (disturbed layers and slump structures).
The most recently formed structures are related to the October 23rd, 2011 Van-Tabanlı (M
w
7.2) earthquake. The exist -ence of seismites at various stratigraphic levels in the lacustrine deposits is indicative of tectonic activity that frequently
triggered earthquakes with magnitudes of 5 or more, affecting the Lake Van Basin.
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Keywords
Seismites, Soft-sediment deformation structures, Earthquake, Lake Van, Turkey
Citation
Geologos, 2014, 20, 2, s. 79-87
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ISBN
978-83-232187-4-6
ISSN
1426-8981