Fiber-optic gyroscope for rotational seismic ground motion monitoring of the Campi Flegrei volcanic area

Year: 2024

Authors: Capezzuto M.; Gaudiosi G.; Nardone L.; D’Alema E.; D’Ambrosio D.; Manzo R.; Giorgini A.; Malara P.; De Natale P.; Gagliardi G.; Amato LS.; Galluzzo D.; Avino S.

Autors Affiliation: Univ Campania Luigi Vanvitelli, Dip Matemat & Fis, Viale Lincoln 5, I-81100 Caserta, Italy; Ist Nazl Ottica INO, Consiglio Nazl Ric, Via Campi Flegrei 34 Comprensorio A Olivetti, I-80078 Pozzuoli, Italy; Osserv Vesuviano, Ist Nazl Geofis & Vulcanol, Via Diocleziano 328, I-80124 Naples, Italy; Ist Nazl Geofis & Vulcanol, Via Bassini 15, I-20133 Milan, Italy; DISTAR Univ Napoli Federico II, Complesso Univ Monte St Angelo, Via Vicinale Cupa Cintia 21, I-80126 Naples, Italy; Ist Nazl Ottica INO, Consiglio Nazl Ric, Largo E Fermi 6, I-50125 Florence, Italy; Ctr Geodesia Spaziale Giuseppe Colombo, Agenzia Spaziale Italiana, I-75100 Matera, Italy.

Abstract: The real-time monitoring of densely populated areas with high seismic and volcanic risk is of crucial importance for the safety of people and infrastructures. When an earthquake occurs, the Earth surface experiences both translational and rotational motions. The latter are usually not monitored, but their measurement and characterization are essential for a full description of the ground motion. Here we present preliminary observational data of a highsensitivity rotational sensor based on a 2 -km -long fiber-optic Sagnac gyroscope, presently under construction in the middle of the Campi Flegrei Volcanic Area (Pozzuoli, Italy). We have evaluated its performance by analyzing data continuously recorded during an acquisition campaign of five months. The experimental setup was composed of a digital nine -component seismic station equipped with both a rotational sensor and conventional seismic sensors (seismometers, accelerometers, and tiltmeters). During this experiment we detected seismic noise and ground rotations wavefield induced by small to medium local earthquakes (M-D < 3). The prototype gyroscope shows a very promising sensitivity in the range of 5 x 10 (- 7) - 8 x 10( - 9) rad / s /root Hz over the frequency bandwidth 5 mHz-50 Hz. Future upgrades and perspectives are discussed. Journal/Review: APPLIED OPTICS

Volume: 63 (16)      Pages from: 4226  to: 4233

More Information: Italian Space Agency (ASI); European Commission; European Defense Fund (EDF).
DOI: 10.1364/AO.518354

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