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| Titel |
Ground-based stereo-photogrammetric monitoring of the active crater of Piton de la Fournaise, La Réunion Island |
| VerfasserIn |
Thomas Dewez, Clément Hibert, Anne Mangeney, Philippe Kowalski, Philipe Catherine, Gilles Grandjean |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048276
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| Zusammenfassung |
| The Piton de la Fournaise on La Réunion Island is a typical example of active volcano where
constructive and destructive phenomena can be observe simultaneously. The UNDERVOLC
project (funded by ANR, the French National Science Foundation) aims at monitoring these
constructive and destructive phenomena as they occur with different geophysical
investigation captors. This contribution is focused on the stereo-photogrammetric
system installed on the edge of the active crater called Dolomieu. The system is
made of a pair of automatically triggered digital reflex cameras connected to a local
download unit and a radio communication system to transmit the data down to the
Volcano Observatory in near real time. After installation in October 2009, the system
was fully operational from 28 December 2009 until 5 April 2010. That means that
nearly 1000 synchronous stereo pairs were shot automatically during day time. This
presentation will discuss the constraints and equipment developments made for
monitoring an unstable active volcano exposed to cyclones and present preliminary
results from the eruption that occurred between January 2 and 12 2010 along the
internal flank of Dolomieu crater. Thanks to day-time hourly acquisition of stereo
pairs, magma volume could be computed from Digital Surface Model differences to
derive magma flow. During the 10 days of the eruption, about 1.5 Mm3 of magma
were poured on the flanks and floor of the crater. Magma flow reached 11.9 m3/s
at the beginning of the eruption between January 2 and 3, followed by period of
relative quiescence with 1.1 m3/s between January 3 and 4, then 6.0 m3/s between
January 4 and 5, and finally an average of 0.05 m3/s between January 5 and 12. |
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