Stressed volcanoes? IAVCEI2013 session on “Stress, strain, and mass changes at active volcanoes”
From: Nico Fournier <n.fournier@xxxxxxxxxx>
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Dear all,
We would like to encourage you to contribute to the IAVCEI2013 2-3 session on “Stress, strain, and mass changes at active volcanoes”.
The IAVCEI 2013 Scientific Assembly will be held at Kagoshima, Japan, on 20-24 July 2013.
Deadline for abstracts is 31 January 2013.
Conveners:
Nico Fournier (GNS Science, NZ)
Yosuke Aoki (ERI, Japan)
Martha Savage (VUW, NZ)
Joachim Gottsmann (Univ. Bristol, UK)
Michael Poland (USGS, Hawaii)
Please find below the session’s abstract.
Please also note that there will be a separate, pre-meeting workshop on 19 July entitled “Workshop on new methods/computer codes for volcano monitoring”, which will be the subject of a second announcement.
Kind regards,
The conveners
2-3. Stress, strain, and mass changes at active volcanoes
Nico Fournier* (n.fournier@xxxxxxxxxx),Yosuke Aoki, Martha Savage, Joachim Gottsmann, Michael Poland
One of the main goals of current volcanological research is the identification of reliable precursors to the onset of eruptions, or to changes in an ongoing eruption. Stress/strain and mass changes at volcanoes have traditionally been monitored using geodetic techniques as a vital indicator of magma migration through the edifice, volcano-tectonic interactions or hydrothermal unrest. In most cases, though, geodesy essentially remains used as an a posteriori assessment of long term changes of activity, and not as a truly near real-time monitoring tool. Furthermore, when stress/strain changes are detected at volcanoes, the discrimination between volcanic or tectonic processes as their main source often remains ambiguous. Recently, several new methods of measuring localised changes in crustal stress and strain (deformation) have been applied to volcanoes with promising results. These methods have included analysis of data from high-rate cGPS networks, SAR, LiDAR, tiltmeters, and volumetric strainmeters; analysis of time variations in gravity and magnetic data; and analysis of changes in seismic wave speeds measured using repeating earthquakes and noise (noise tomography), changes in earthquake fault and slip orientation (fault-plane solution analysis), and changes in the directional variation of seismic wave speed (seismic anisotropy analysis). The main goal of this session is to highlight a wide range of observations of phenomena that may be linked to temporal changes in stress and strain and associated rock or magma properties at varying timescales on restless or active volcanoes, including but not limited to temporal changes in proximal and distal seismicity, surface deformation, gas emissions, microgravity, self-potential, and volcano hydrology. A second goal is to encourage discussion, refinement, and synthesis of physical and numerical models for the observed changes. We encourage contributions from both observational and theoretical perspectives and particularly studies that combine two or more techniques.
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Nicolas Fournier, Volcano Geodesist
GNS Science - Te Pu Ao - Wairakei Research Centre
114 Karetoto Rd, State Highway 1, Wairakei, Private Bag 2000, Taupo, 3352, New Zealand
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