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      Very- and ultra-long-period seismic signals prior to and during caldera formation on La Réunion Island

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          Abstract

          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.

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          Most cited references 57

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          Determination of earthquake source parameters from waveform data for studies of global and regional seismicity

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                Author and article information

                Contributors
                frfont@ipgp.fr
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                30 May 2019
                30 May 2019
                2019
                : 9
                Affiliations
                [1 ]Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
                [2 ]Université de La Réunion, Laboratoire GéoSciences Réunion, F-97744 Saint Denis, France
                [3 ]ISNI 0000 0001 2180 7477, GRID grid.1001.0, Research School of Earth Sciences, , The Australian National University, ; Canberra, ACT 2601 Australia
                [4 ]ISNI 0000 0001 0675 8101, GRID grid.9489.c, Observatoire volcanologique du Piton de la Fournaise, Institut de physique du globe de Paris, ; F-97418 La Plaine des Cafres, France
                [5 ]CEA/DASE/Laboratoire de Géophysique, Commissariat à l’Energie Atomique, BP 640, 98713 Papeete, Tahiti French Polynesia
                [6 ]ISNI 0000 0001 2156 2780, GRID grid.5801.c, Swiss Seismological Service, ETH Zurich, ; Sonneggstrasse 5, CH-8092 Zurich, Switzerland
                Article
                44439
                10.1038/s41598-019-44439-1
                6543087
                31147579
                © The Author(s) 2019

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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                © The Author(s) 2019

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                natural hazards, seismology, volcanology

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