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Geologos

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Seismogenic structures in Quaternary lacustrine deposits of Lake Van (eastern Turkey)

Serkan Üner
  • Yüzüncü Yil University, Dept. of Geological Engineering, 65080 Zeve Campus / Van, Turkey
  • :
Published Online: 2014-07-08 | DOI: https://doi.org/10.2478/logos-2014-0011

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-Tabanli (M 7.2) earthquake. The existence 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.

Keywords: Seismites; soft-sediment deformation structures; earthquake; Lake Van; Turkey

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Received: 2013-11-07

Accepted: 2013-12-17

Published Online: 2014-07-08


Citation Information: Geologos. Volume 20, Issue 2, Pages 79–87, ISSN (Online) 2080-6574, DOI: https://doi.org/10.2478/logos-2014-0011, July 2014

© 2014 Serkan Üner. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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