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Remote Sens. 2016, 8(8), 674; doi:10.3390/rs8080674

Distributed-Temperature-Sensing Using Optical Methods: A First Application in the Offshore Area of Campi Flegrei Caldera (Southern Italy) for Volcano Monitoring

1
Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione di Napoli Osservatorio Vesuviano, Via Diocleziano 328, 80124 Napoli, Italy
2
Optosensing S.r.L., Via Olivetti 1, Pozzuoli, 80079 Napoli, Italy
3
Istituto per l’Ambiente Marino Costiero (IAMC), CNR, Calata p.ta di Massa, 80133 Napoli, Italy
4
Dipartimento di Ingegneria Industriale e dell’Informazione, Seconda Università di Napoli, Via Roma 29, 80134 Aversa, Italy
5
Department of Geophysics and Space Science, Eötvös Loránd University, Pázmány Péter Sétány 1/C, 1117 Budapest, Hungary
*
Author to whom correspondence should be addressed.
Academic Editors: Andrew McGonigle, Zhong Lu, Richard Gloaguen and Prasad S. Thenkabail
Received: 16 May 2016 / Revised: 12 August 2016 / Accepted: 15 August 2016 / Published: 19 August 2016
View Full-Text   |   Download PDF [14305 KB, uploaded 19 August 2016]   |  

Abstract

A temperature profile 2400 m along the off-shore active caldera of Campi Flegrei (Gulf of Pozzuoli) was obtained by the installation of a permanent fiber-optic monitoring system within the framework of the Innovative Monitoring for Coastal and Marine Environment (MON.I.C.A) project. The system consists of a submerged, reinforced, multi-fiber cable containing six single-mode telecom grade optical fibers that, exploiting the stimulated Brillouin scattering, provide distributed temperature sensing (DTS) with 1 m of spatial resolution. The obtained data show that the offshore caldera, at least along the monitored profile, has many points of heat discharge associated with fluid emission. A loose association between the temperature profile and the main structural features of the offshore caldera was also evidenced by comparing DTS data with a high-resolution reflection seismic survey. This represents an important advancement in the monitoring of this high-risk volcanic area, since temperature variations are among the precursors of magma migration towards the surface and are also crucial data in the study of caldera dynamics. The adopted system can also be applied to many other calderas which are often partially or largely submerged and hence difficult to monitor. View Full-Text
Keywords: temperature; remote sensing; DTS; fiber optics; caldera; Campi Flegrei temperature; remote sensing; DTS; fiber optics; caldera; Campi Flegrei
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Carlino, S.; Mirabile, M.; Troise, C.; Sacchi, M.; Zeni, L.; Minardo, A.; Caccavale, M.; Darányi, V.; De Natale, G. Distributed-Temperature-Sensing Using Optical Methods: A First Application in the Offshore Area of Campi Flegrei Caldera (Southern Italy) for Volcano Monitoring. Remote Sens. 2016, 8, 674.

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