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

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021515 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021515_1
Genre: Conference Paper

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 Creators:
Vesely, Nele1, Author
Eibl, Eva P. S.1, Author
Ferrazzini, Valérie1, Author
Wassermann, Joachim1, Author
Vollmer, Daniel1, Author
Brunet, Christophe1, Author
Lauret, Frédéric1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-4075
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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