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Fluid migrations and volcanic earthquakes from depolarized ambient noise

Earth Sciences

Fluid migrations and volcanic earthquakes from depolarized ambient noise

S. Petrosino and L. D. Siena

Discover how ambient noise polarization reveals the hidden dynamics of fluid migration in volcanoes. This groundbreaking research by S. Petrosino and L. De Siena sheds light on the connections between seismic activity and the hydrothermal systems at Campi Flegrei caldera, offering exciting insights into monitoring volcanic activity in real-time.

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Playback language: English
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.
Publisher
Nature Communications
Published On
Nov 17, 2021
Authors
S. Petrosino, L. De Siena
Tags
ambient noise
polarization
fluid migration
Campi Flegrei
volcanic systems
earthquakes
seismic activity
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