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Fluid migrations and volcanic earthquakes from depolarized ambient noise

Author

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  • S. Petrosino

    (Sezione di Napoli - Osservatorio Vesuviano)

  • L. De Siena

    (Johannes Gutenberg University
    Johannes Gutenberg University)

Abstract

Ambient noise polarizes inside fault zones, yet the spatial and temporal resolution of polarized noise on gas-bearing fluids migrating through stressed volcanic systems is unknown. Here we show that high polarization marks a transfer structure connecting the deforming centre of the caldera to open hydrothermal vents and extensional caldera-bounding faults during periods of low seismic release at Campi Flegrei caldera (Southern Italy). Fluids pressurize the Campi Flegrei hydrothermal system, migrate, and increase stress before earthquakes. The loss of polarization (depolarization) of the transfer and extensional structures maps pressurized fluids, detecting fluid migrations after seismic sequences. After recent intense seismicity (December 2019-April 2020), the transfer structure appears sealed while fluids stored in the east caldera have moved further east. Our findings show that depolarized noise has the potential to monitor fluid migrations and earthquakes at stressed volcanoes quasi-instantaneously and with minimum processing.

Suggested Citation

  • S. Petrosino & L. De Siena, 2021. "Fluid migrations and volcanic earthquakes from depolarized ambient noise," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26954-w
    DOI: 10.1038/s41467-021-26954-w
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    References listed on IDEAS

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    1. Maria Saade & Kohtaro Araragi & Jean Paul Montagner & Edouard Kaminski & Philippe Roux & Yosuke Aoki & Florent Brenguier, 2019. "Evidence of reactivation of a hydrothermal system from seismic anisotropy changes," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    2. Christopher R.J. Kilburn & Giuseppe De Natale & Stefano Carlino, 2017. "Progressive approach to eruption at Campi Flegrei caldera in southern Italy," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    3. Manuele Faccenda & Luigi Burlini & Taras V. Gerya & David Mainprice, 2008. "Fault-induced seismic anisotropy by hydration in subducting oceanic plates," Nature, Nature, vol. 455(7216), pages 1097-1100, October.
    4. Giovanni Chiodini & Antonio Paonita & Alessandro Aiuppa & Antonio Costa & Stefano Caliro & Prospero De Martino & Valerio Acocella & Jean Vandemeulebrouck, 2016. "Magmas near the critical degassing pressure drive volcanic unrest towards a critical state," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
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