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Conference Paper

Implementation of an array and a rotational sensor on Piton de la Fournaise volcano, La Réunion

Authors

Vesely,  Nele
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Eibl,  Eva P. S.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ferrazzini,  Valérie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wassermann,  Joachim
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Vollmer,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Brunet,  Christophe
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lauret,  Frédéric
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Vesely, N., Eibl, E. P. S., Ferrazzini, V., Wassermann, J., Vollmer, D., Brunet, C., Lauret, F. (2023): Implementation of an array and a rotational sensor on Piton de la Fournaise volcano, La Réunion, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4075


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021515
Abstract
La Réunion, an island in the Indian Ocean, hosts the shield volcano Piton de la Fournaise that recently tends to erupt up to twice per year. The seismic recordings show a great signal diversity including tectonic and volcano-tectonic (VT) earthquakes, eruption tremor, (very) long period events along with a variety of rockfalls.With the aim of testing the rotational sensor performance in comparison with a conventional seismic array, one rotational sensor and an array of seven seismometers were installed within the Enclos-Fouqué caldera. A permanent station of the monitoring network of the Observatoire Volcanologique du Piton de la Fournaise (OVPF) is included in the temporal network. Recordings of (volcano-) seismic signals, detected by the OVPF’s network, are compared to those of the rotational sensor and the array.We calculate the signal-to-noise ratio (SNR), derive the rotation rate using three array stations for array derived rotation (ADR) and compare the backazimuth (BAZ) results using different approaches. The rotational sensor and the array BAZ are furthermore compared to the OVPF’s localizations.Whereas the array BAZ for summit VT events and the rockfall agree with the locations of the OVPF network, the rotational sensor BAZ indicates possible agreement for the rockfall event. Further BAZ results from the rotational sensor are interpreted to be affected by site inhomogeneity. The array stations show higher SNR results than the rotational sensor. As burying of the instruments on site was not possible, the sensors are affected by wind, increasing the noise floor and decreasing the instruments’ sensitivity.