Real time monitoring of vertical ground deformations during eruptions at Piton de la Fournaise
Toutain, Jean‐Paul; Bachelery, Patrick; Blum, Pierre‐Antoine; Cheminee, Jean‐Louis; Delorme, Hugues; Fontaine, Laurent; Kowalski, Philippe; Taochy, Philippe; Toutain, Jean‐Paul; Institut de Physique du Globe de Paris, Observatoire Volcanologique, de Piton de la Fournaise; Bachelery, Patrick; Départment des Sciences de la Terre, Université de Le Réunion; Blum, Pierre‐Antoine; Institut de Physique du Globe de Paris, Observatories Volcanologiques; Cheminee, Jean‐Louis; Institut de Physique du Globe de Paris, Observatories Volcanologiques; Delorme, Hugues; Institut de Physique du Globe de Paris, Observatories Volcanologiques; Fontaine, Laurent; Institute de Physique du Globe de Paris, Observatoire Volcanologique, du Piton de la Fournaise; Kowalski, Philippe; Institute de Physique du Globe de Paris, Observatoire Volcanologique, du Piton de la Fournaise; Taochy, Philippe; Institute de Physique du Globe de Paris, Observatoire Volcanologique, du Piton de la Fournaise
Журнал:
Geophysical Research Letters
Дата:
1992
Аннотация:
Tilt changes related to a summit dike emplacement at Piton de la Fournaise volcano have been recorded by a 4 continuously recording electronic tiltmeters network during the April 18, 1990 eruption. The real‐time processing of these data at the Observatory allows to calculate during the emplacement the relative position of the inflation center from the tilt vectors supplied by the nearby stations. Two main steps have been identified: an initial subvertical intrusion step, followed by a lateral dike migration from the summit cone. This monitoring allows to calculate a high average intrusion velocity of about 0.2 m.sec<sup>−1</sup> which can related to the highly fracturated pattern of the summit area.
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