*************************************************************** From: Larry G. Mastin <lgmastin@xxxxxxxx> *************************************************************** Colleagues: Please consider contributing to the following topical session, to be held at the 2009 Geological Society of America National Meeting, Portland, Oregon (USA), October 18-21, 2009. "PHYSICS OF VOLCANIC ERUPTIONS: IMPLICATIONS FOR HAZARDS" Conveners: Larry G. Mastin; Donald B. Dingwell; Kelly Russell Abstract deadline: August 11, 2009 Description: This session explores the physical processes involved in volcanic eruptions and the effects of these processes on hazards. We encourage process-oriented field, laboratory, theoretical, numerical, and instrumental studies with significant implications for hazards. Rationale: Volcanic eruptions and their associated hazards are the culmination of many processes under active study. These include the flow, fracture, or fragmentation of magma within dikes or conduits; magmatic degassing; interaction of ascending magma with surface or subsurface water; and, for pyroclastic eruptions, the interaction of particles with air, water, and the ground surface within plumes, ash clouds, and pyroclastic flows. To a first order, we know that properties such as viscosity or gas content govern styles of eruption, ranging from lava effusion to explosive pyroclastic jets. We also understand the basic properties such as temperature, efficiency of air entrainment, etc. that govern whether pyroclastic jets develop into buoyant plinian columns or collapse. Over the last decade, these processes have been simulated via increasingly sophisticated numerical models, some of which have been used to forecast hazards during real eruptions. But the realism of such models, and their value in assessing hazards, has been limited by how accurately they represent physical properties of the magma, gas, atmosphere, and host rock; and how accurately they simulate physical processes of transport, deformation, mixing, and phase interaction. In this session, we examine the state of the art in eruption physics, with emphasis toward hazards applications. We invite contributions from experiments, numerical simulations, field studies, and new instruments or techniques that shed light on these processes. For more information: http://www.geosociety.org/meetings/2009/sessions/topical.asp?CatID=Volcanology&submit=Go Larry Mastin Don Dingwell Kelly Russell ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
