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From: Miguel Alatorre <alatorre.miguel@xxxxxxxxx>
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Dear colleagues,
We would like to draw your attention to the following sessions sponsored
by the Volcanology, Geochemistry, and Petrology Section of the American
Geophysical Union during the AGU Joint Assembly to be held in Acapulco,
Mexico in May 22-25, 2007.
V05: Processes and Hazards of Monogenetic Volcanoes: Are they what
everyone thinks they are?
V09: Towards Integrated Studies on Volatiles in Magmas: from the Mantle
to the Atmosphere.
V14: Physical and experimental volcanology: state of the art and hazards
analysis applications.
For details and abstract submission procedures please see:
http://www.agu.org/meetings/ja07/
The DEADLINE for electronic submission of abstracts is MARCH 1, 2007,
2359 UT.
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V05: Processes and Hazards of Monogenetic Volcanoes: Are they what
everyone thinks they are?
Monogenetic volcanic fields consisting of cinder and scoria cones are
common in many places around the world. Small to large human settlements
are frequently built close to or on the products from these cones. The
most common interpretation about the eruptive style of these small cones
is that they are characterized by strombolian eruptions accompanied by
lava flows. In other words, the most common idea, from the hazards point
of view, is that these small cones are characterized by mild eruptive
styles and therefore the related hazards are relatively minor. However,
the deposits from these cones indicate a wide range of explosive
behavior from weak strombolian to subplinian. This session will address
the real explosive potential of this kind of volcanism, including the
formation and characteristics of magma in the deep source region, the
processes during ascent through the crust, the eruption of lava flows
and explosive products, and the likely range of hazards.
Conveners:
Hugo Delgado Granados
Departamento de Vulcsanología
Instituto de Geofisica, UNAM
hugo@xxxxxxxxxxxxxxxxx
Katharine Cashman & Paul Wallace
University of Oregon
Department of Geological Sciences
cashman@xxxxxxxxxxx / pwallace@xxxxxxxxxxx
Rebecca Lange
University of Michigan
Dept. of Geological Sciences
becky@xxxxxxxxx
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V09: Towards Integrated Studies on Volatiles in Magmas: from the Mantle
to the Atmosphere
Magmas transfer volatiles from the Earth’s interior to the oceans and
atmosphere. On their way to the surface, volatiles can be separated from
magma and contribute to hydrothermal systems and/or produce fumarolic
emissions. Exsolution and loss of volatiles, particularly H2O, also
leads to major changes in magma crystal content, density and viscosity.
Finally, gas emissions during volcanic eruptions can have important
effects on the atmosphere and climate. These factors make volatiles an
essential concern of volcanology, and understanding their behavior and
influence on a wide variety of geological phenomena is crucial.
Processes of deep or shallow degassing are important to identify
processes and monitor/forecast changes in eruption style (explosive to
dome building), which in turn is essential for hazard evaluation and
risk assessment. Degassing at volcanoes is currently measured by several
remote-sensing techniques including COSPEC, DOAS, FTIR and satellite
imagery (TOMS, MODIS, ASTER, etc.), and the techniques are improving
rapidly. On the other end, new analytical techniques to measure
pre-eruptive volatile content in volcanic rocks combined with laboratory
experiments on volatile solubility and thermodynamic modeling contribute
to advances in our understanding of volatile fluxes from magmatic
systems. Consequently, the goal of this session is to integrate
information on volatiles exsolution, movement, their role in
fragmentation processes, and injection into the atmosphere or oceans. It
is also hoped that this session will stimulate collaboration between the
different fields of study concerning volatiles in magmas.
Conveners:
Julie Roberge & Hugo Delgado Granados
Instituto de Geofisica, UNAM
roberge@xxxxxxxxxxxxxxxxx / hugo@xxxxxxxxxxxxxxxxx
William I. Rose
Department of Geological Engineering and Sciences
Michigan Technological University
raman@xxxxxxx
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V14: Physical and experimental volcanology: state of the art and hazards
analysis applications
Dealing with hazards related to active volcanoes a good understanding of
pre- and syn-eruptive processes is needed. Even with a good monitoring
system, the data required for such understanding cannot be achieved by
direct field observations alone as direct observations of eruption
processes in the field are limited to those parts of an eruption that
are accessible. Experiments using magma analogues and natural materials
have become more widely applied to the investigations of complex
dynamical processes and their mechanisms because the problems of
accessibility are reduced significantly. Therefore, experimental and
theoretical modeling are two further essential components of modern
volcanic hazard analysis. The goal of this session is to review the
present knowledge from experimental volcanology and physical modeling
and its relation with monitoring and field observations in order to
enhance the hazard analysis of active volcanoes.
Conveners:
Donald B. Dingwell
Department for Earth and Environmental Sciences
University of Munich
Dingwell@xxxxxx
Miguel A. Alatorre-Ibargüengoitia
Instituto de Geofisica, UNAM
malatorre@xxxxxxxxxxxxxx
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We look forward to seeing you next May in Acapulco, Mexico.
Best wishes for the beginning of 2007,
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