A debris avalanche at Süphan stratovolcano (Turkey) and implications for hazard evaluation

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• 作者：Yavuz Özdemir ; İsmail Akkaya ; Vural Oyan ; Karim Kelfoun
• 关键词：Süphan stratovolcano ; Eastern anatolia ; Debris avalanche ; Tsunami ; Volcflow
• 刊名：Bulletin of Volcanology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：78
• 期：2
• 全文大小：37,539 KB
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• 作者单位：Yavuz Özdemir (1)
  İsmail Akkaya (2)
  Vural Oyan (3)
  Karim Kelfoun (4)
  
  1. Department of Geological Engineering, Yuzuncu Yıl University, Van, Turkey
  2. Department of Geophysical Engineering, Yuzuncu Yıl University, Van, Turkey
  3. Department of Mining Engineering, Yuzuncu Yıl University, Van, Turkey
  4. Laboratoire Magmas et Volcans, Université Blaise Pascal, Clermont-Ferrand, France
  
• 刊物主题：Geology; Geophysics/Geodesy; Mineralogy; Sedimentology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0819

文摘

The Quaternary Süphan debris avalanche deposit is located in Eastern Anatolia, Turkey. The avalanche formed by the sector collapse of a major stratovolcano towards the north, possibly during a single catastrophic event. The deposit has an estimated volume of 4 km3 and ran out over 25 km to cover an area of approximately 200 km2. Products of the collapse are overlain by younger eruptive units from the Süphan volcano. We have tested the numerical code VolcFlow to first reproduce the emplacement of the Quaternary Süphan debris avalanche and then to develop a hazard assessment for potential future sector collapses and subsequent emplacement of debris avalanches and associated tsunami. The numerical model captures the main features of the propagation process, including travel distance, lateral spread, and run up. The best fit obtained for the existing flow has a constant retarding stress of 50 kPa and a collapse scar volume of 4 km3. Analysis of potential future collapse scenarios reveals that northern sector debris avalanches (up to 6 km3) could affect several towns. In the case of a sector collapse towards the south, a tsunami will reach the city of Van and several of the biggest towns on the southern shoreline of Lake Van. Cities most affected by the larger amplitude waves would be Van, Edremit, Gevaş, Tatvan, and, to a lesser extent, Erciş, with wave amplitudes (first waves after the onset of the collapse) between 8 and 10 m. Keywords Süphan stratovolcano Eastern anatolia Debris avalanche Tsunami Volcflow