************************************************************************ From: Laurent Michon <laurent.michon@xxxxxxxxxxxxxxx> ************************************************************************ Following the 1st and 2nd Workshop on Collapse Calderas held at Las Cañadas caldera, Tenerife, and Queretaro, Mexico, on October, 2005 and 2008, the 3rd Workshop on Collapse Calderas will be held in La Réunion Island between October 3-9, 2010. La Réunion Island is the site of one of the world's most active shield volcanoes, i.e. Piton de la Fournaise, which experienced the most recent caldera collapse in April 2007 and recurrent collapse events during its evolution. The island is also built by an extinct shield volcano, Piton de Neiges, whose latter activity was characterised by large explosive eruptions yielding several ignimbrites deposits. This volcano is now intensively incised by 2000m deep canyons where subsurface structures (sheet intrusions, gabbro bodies and faults) outcrop. The purpose of the workshop is to evaluate the present state of knowledge on collapse calderas, focusing on the dynamics and modelling of both silicic and basaltic calderas. We propose to structure the workshop around the following sessions: - From pit craters to large calderas on basaltic volcanoes: origin of the collapse structure. - Silicic calderas on stratovolcanoes and supervolcanoes: just a matter of size? - Planetary calderas. - Influence of regional inheritance and stress field in caldera development. - Collapse, eruption dynamics and geometry of the caldera. - Modelling caldera unrest, collapse and post collapse. - Geophysical and geochemical monitoring of calderas. - Patterns of post caldera magmatic and volcanic activity. - Assessment and mitigation of risk associated to calderas. Moreover, we would like to promote (i) general discussions on conceptual aspects such as "the definition of a caldera" or "the relevancy for comparing basaltic and silicic calderas and" (ii) discussions organised and chaired by PhD students on topics of their own choice. Field excursions will be organised on Piton des Neiges where ignimbrites and subsurface intrusions outcrop and on Piton de la Fournaise that shows large concentric calderas and the recent April 2007 summit caldera. In addition, field work will also focus on two hot topics on caldera studies: i) vertical vs. lateral collapses in caldera environments, ii) caldera migration. In order to achieve these objectives we wish to gather a group of scientists interested in discussing these topics. The Workshop is being co-sponsored by the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), the Université de La Réunion, and Regional and General Councils of Reunion Island. Call for papers, registration deadline and cost: We encourage the community working on calderas to submit an extended abstract (6 pages max) to the workshop by sending an e-mail to either of the conveners. The deadline for abstract submission is October 31, 2009. Maximum costs will be around 700-800€, including hotel and meals during the workshop, fieldtrips, and transportation to and from the airport to the workshop's venue. Participants could benefit from discount flight tickets from Paris to La Réunion Island. Please contact the conveners for information. The workshop is limited to 100 participants. Graduate students are welcome to attend and limited financial assistance will be available. Organisers: Laurent Michon: Laboratoire GéoSciences, Université de La Réunion, Institut de Physique du Globe de Paris, laurent.michon@xxxxxxxxxxxxxxx Patrick Bachèlery: Laboratoire GéoSciences, Université de La Réunion, Institut de Physique du Globe de Paris, bachel@xxxxxxxxxxxxxxx Andrea di Muro: Observatoire Volcanologique du Piton de la Fournaise, Institut de Physique du Globe de Paris, dimuro@xxxxxxxxxxxxxxx ============================================================== 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. ==============================================================
