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

Content Provider	Springer Nature Link
Author	Özdemir, Yavuz Akkaya, İsmail Oyan, Vural Kelfoun, Karim
Copyright Year	2016
Abstract	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.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	78
Issue Number	2
e-ISSN	14320819
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-09
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Süphan stratovolcano Eastern anatolia Debris avalanche Tsunami Volcflow Geology Geophysics/Geodesy Mineralogy Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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