Very- and ultra-long-period seismic signals prior to and during caldera formation on La Réunion Island.
- Resource Type
- Academic Journal
- Authors
- Fontaine FR; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France. frfont@ipgp.fr.; Université de La Réunion, Laboratoire GéoSciences Réunion, F-97744, Saint Denis, France. frfont@ipgp.fr.; Roult G; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Hejrani B; Research School of Earth Sciences, The Australian National University, Canberra, ACT, 2601, Australia.; Michon L; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Université de La Réunion, Laboratoire GéoSciences Réunion, F-97744, Saint Denis, France.; Ferrazzini V; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Observatoire volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, F-97418, La Plaine des Cafres, France.; Barruol G; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Université de La Réunion, Laboratoire GéoSciences Réunion, F-97744, Saint Denis, France.; Tkalčić H; Research School of Earth Sciences, The Australian National University, Canberra, ACT, 2601, Australia.; Di Muro A; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Observatoire volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, F-97418, La Plaine des Cafres, France.; Peltier A; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Observatoire volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, F-97418, La Plaine des Cafres, France.; Reymond D; CEA/DASE/Laboratoire de Géophysique, Commissariat à l'Energie Atomique, BP 640, 98713, Papeete, Tahiti, French Polynesia.; Staudacher T; Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.; Observatoire volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, F-97418, La Plaine des Cafres, France.; Massin F; Swiss Seismological Service, ETH Zurich, Sonneggstrasse 5, CH-8092, Zurich, Switzerland.
- Source
- Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: PubMed not MEDLINE
- Subject
- Language
- English
Early detection of the onset of a caldera collapse can provide crucial information to understand their formation and thus to minimize risks for the nearby population and visitors. Here, we analyse the 2007 caldera collapse of Piton de la Fournaise on La Réunion Island recorded by a broadband seismic station. We show that this instrument recorded ultra-long period (ULP) signals with frequencies in the range (0.003-0.01 Hz) accompanied by very-long period (VLP) signals (between 0.02 and 0.50 Hz) prior to and during the caldera formation suggesting it is possible to detect the beginning of the collapse at depth and anticipate its surface formation. Interestingly, VLP wave packets with a similar duration of 20 s are identified prior to and during the caldera formation. We propose that these events could result from repeating piston-like successive collapses occurring through a ring-fault structure surrounding a magma reservoir from the following arguments: the source mechanism from the main collapse, the observations of slow source processes as well as observations from the field and the characteristic ring-fault seismicity.