1-1-1-1-1-1-1-1-1-1-1-1-1-1 From: Krista Evans <kevans3@xxxxxxxxxx> Dear colleagues, We draw your attention to the session *Pyroclastic Density Currents and the Destruction of Cities â?? the Archaeological Evidence*, convened as part of the *Cities on Volcanoes 11 Meeting *in Heraklion (Greece), between May 23 and 27, 2019 (www.citiesonvolcanoes11.com). Deadline for abstract submission is January 25, 2020. *S4.6 | Pyroclastic Density Currents and the Destruction of Cities â?? the Archaeological Evidence* *CONVENERS:* *Krista Evans* | *University of Hawaii at Manoa, USA* *Floyd McCoy* | *University of Hawaii Windward Community College, USA* *Timothy Druitt* | *Clermont Auvergne University, France* Pyroclastic density currents (PDC's) can be mechanisms for both the preservation and destruction of anthropogenic structures. Certainly, these form suitable sites for understanding the dynamics of PDCâ??s and their interaction with buildings and walls. An example comes from the Late Bronze Age (LBA) eruption of Santorini (Thera, Cyclades, Greece). At the prehistoric city of Akrotiri, an earlier phase of this eruption of pumice-fall deposits buried and preserved buildings and walls. However, the following eruption phase produced thick sequences of PDCâ??s. Their initial movement over the partially-buried city was initially channeled down streets and deflected around the upper-stories of unburied buildings protruding above thick pumice deposits indicating PDC velocities were inadequate to knock-down and destroy these stone structures (ashlar-type construction of LBA multistory buildings). Midway through the PDC eruptive phase, however, PDCâ??s developed adequate force to destroy such buildings and flow across the sea. Accordingly, the irregular surface at the archaeological excavation today that marks the contact between preserved and broken structures marks this transition in PDC dynamics. This session discusses the eruptive and flow dynamics of PDCâ??s as indicated by preservation/destruction patterns with structures, both cultural and geological. Thanks for your consideration! 1-1-1-1-1-1-1-1-1-1-1-1-1-1 ============================================================== 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. ============================================================== ------------------------------
