****************************************************************** From: Diana Roman <droman@xxxxxxxxxxx> ****************************************************************** The submission deadline is approaching! Please consider making a contribution to the following session at the upcoming 2008 AGU Fall Meeting by Wednesday, September 10, 2359 UTC: V27: "Failed" Magmatic Eruptions: When Unrest Leads to Quiescence When a volcano becomes restless, one of the primary questions asked of scientists is whether the unrest and underlying processes will lead to a magmatic eruption. "Failed" magmatic eruptions, where magma comes close to erupting but ultimately fails to reach the surface, can have significant negative consequences, particularly if the associated unrest leads to erroneous forecasts. Over the last several decades "failed" magmatic eruptions have been preceded by various combinations of increased degassing and thermal output, phreatic eruptions, shallow earthquake swarms (some with felt and/or low-frequency events), and notable ground deformation. Unequivocal cases of failed magmatic eruptions include Soufrière Guadeloupe (1975-76) and Akutan, Alaska (1996). Arguable cases include Mount Baker, Washington (1975), Iliamna, Alaska (1996), Iwate, Japan (1998), Deception Island, Antarctica (1998), Fourpeaked, Alaska (2006), Huila, Colombia, (2007), and many others. A few such cases are well studied, but many are poorly documented in the literature; thus details of these events are often unavailable to scientists for comparison to an ongoing episode of unrest. One of the primary goals of this session is to highlight examples of volcanic unrest that ultimately failed to produce a magmatic eruption. Another goal is to explore possible discriminants that could indicate whether unrest will or won't lead to eruption, along with physical models for failure or arrest of ascending or convecting magma. We encourage contributions from both observational and theoretical perspectives. Invited presenters: Francois Beauducel, Institut de Physique du Globe de Paris Takeshi Nishimura, Tohoku University John Power, USGS Alaska Volcano Observatory Cynthia Werner, USGS Cascades Volcano Observatory Session conveners: Seth Moran U.S. Geological Survey - Cascades Volcano Observatory smoran@xxxxxxxx Chris Newhall Earth Observatory of Singapore - Nanyang Technological University cnewhall@xxxxxxxxxx Diana Roman University of South Florida droman@xxxxxxxxxxx ============================================================== 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. ==============================================================
