4-4-4-4-4-4-4-4-4-4-4-4-4 From: "Zernack, Anke" <A.V.Zernack@xxxxxxxxxxxx> Dear colleagues and friends, We would like to invite you to contribute to the following CoV11 session: S1.17 Advances in understanding volcanic debris avalanche processes and hazards - from field studies to experimental and numerical modelling applications https://pcoconvin.eventsair.com/volcanoes11/session01#S117 *Session details*: The formation of volcanic debris avalanches (VDA) resulting from the failure of an unstable edifice represents the largest-magnitude hazard from active, dormant and even extinct stratovolcanoes. While these events are much less frequent than other volcanic hazards, they represent by far the most destructive scenario, involving large volumes of debris and potential travel distances of more than 100 km. The 18 May 1980 Mount St. Helens eruption, 40 years ago this month, presented the first opportunity to observe and document the generation and emplacement of a large VDA. These observations integrated with studies of the produced deposits provided a ground-breaking model for the interpretation of similar deposits elsewhere. Consequently, VDA deposits have been recorded at many volcanoes worldwide and their generation through catastrophic edifice failure is now recognised as a common, often recurring phenomenon in the life cycle of long-lived composite volcanoes. While research since the 1980 event has significantly improved our knowledge of the factors leading to volcano collapse as well as VDA transport and emplacement processes, their complex flow dynamics are still not fully understood. In particular the observed excess run out and transformation into cohesive debris flows pose challenges for accurate numerical modelling and similarly, more precise input parameters are required for the development of realistic hazard models. We invite contributions from field, experimental and modelling approaches focused on advances in understanding volcanic instability, trigger mechanisms of catastrophic edifice failure, VDA transport and emplacement processes and sedimentary characteristics of the resulting deposits. *Conveners*: Anke Zernack, Jonathan Procter, Stuart Mead, Matteo Roverato Submission deadline is January 25th. We look forward to seeing you on Crete! 4-4-4-4-4-4-4-4-4-4-4-4-4 ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - http://pdx.edu/ GVP - http://www.volcano.si.edu/ IAVCEI - https://www.iavceivolcano.org/ To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx. To contribute to the volcano list, send your message to: volcano@xxxxxxx. Please do not send attachments. ============================================================== ------------------------------
