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Earthquake Eyes: Volcano-Monitoring Gyroscope Unlocks Seismic Secrets

June 18, 2024
in Science
Earthquake Eyes: Volcano-Monitoring Gyroscope Unlocks Seismic Secrets
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Volcano Measurement Simuation Art Concept

A new fiber optic gyroscope developed for the volcanic Campi Flegrei region in Naples has shown potential in improving earthquake monitoring by detecting ground rotations. This system, tested over several months, could provide crucial data for early warning systems and risk assessments in seismically active volcanic areas. Credit: SciTechDaily.com

Researchers have developed a fiber optic gyroscope prototype to monitor ground rotations during earthquakes in Campi Flegrei, Naples. This advanced sensor system, capturing rotational and linear movements, could lead to better risk assessments and early warning systems in this volcanic region.

“When seismic activity occurs, the Earth’s surface experiences both linear and rotational movements,” said research team leader Saverio Avino from the Consiglio Nazionale delle Ricerche Istituto Nazionale di Ottica. “Although rotations are generally very small and not usually monitored, the ability to capture them would provide a more complete understanding of the Earth’s internal dynamics and seismic sources.”

Their new rotational sensor, based on a 2-km long fiber-optic gyroscope, recorded data continuously over five months and successfully detected noise and ground rotations from small to medium local earthquakes. The researchers published the preliminary observational data from the sensor in the Optica Publishing Group journal Applied Optics.

Fiber Optic Gyroscope Prototype

Researchers built a prototype fiber optic gyroscope (pictured) for high resolution, real-time monitoring of ground rotations caused by earthquakes in an active volcanic area. The fibers are precisely wound around an aluminum spool to form a gyroscope based on the Sagnac effect. Credit: Saverio Avino, CNR-INO

Sensor Deployment in Naples

Naples, home to approximately 3 million people and three active volcanoes, is equipped with a network of multiparametric sensors that covers the entire city. These sensors monitor various physical and chemical parameters to study seismic and volcanic activity in real time.

“The measurement of ground rotations will add another tile to this complex mosaic of sensors,” stated Danilo Galuzzo from the National Institute of Geophysics and Volcanology. “This additional information will also aid in the comprehensive understanding of volcanic earthquake signals, which are crucial for detecting any changes in the dynamics of volcanoes.”

Earthquake Swarm Graph

The fiber optic gyroscope captured small to medium earthquakes, including this swarm of earthquakes, in the volcanic area of Campi Flegrei in Naples, Italy. Credit: Saverio Avino, CNR-INO

Measuring Rotational Movement

Gyroscopes are devices used to detect and measure changes in orientation or angular velocity – the rate at which an object rotates. For example, in smartphones simple gyroscopes detect and measure the device’s orientation and rotation. To measure rotation in seismic waves from an earthquake or volcanic activity, the researchers developed a more complex gyroscope based on the Sagnac effect.

The Sagnac effect occurs when light traveling in opposite directions around a closed loop exhibits different travel times. This leads to measurable interference patterns in the light that depend on the rotation rate of the loop. By measuring the light interference, the angular velocity can be detected with high resolution.

Campi Flegrei Volcanic Area

Map of the Campi Flegrei volcanic area with seismic stations of the monitoring network (blue triangles) and the fiber-optic gyroscope (orange circle) and some recorded seismic events (red circles). Credit: Saverio Avino, CNR-INO

“Our labs are located in the heart of an active volcanic area, thus creating a natural source of earthquakes,” said Avino. “Because we experience small/medium earthquakes almost every day, we can measure and acquire a large number of data on ground rotations, which can be successively analyzed in to study seismic and volcanic phenomena of the Campi Flegrei region.”

Capturing Seismic Activity

The researchers assembled a prototype fiber-optic rotational sensor using standard laboratory instrumentation and components. To test it, they injected light into a 2-kilometer-long optical fiber cable, similar to the ones used for optical telecommunication. The fiber cable formed a loop where the input and output are connected, creating a continuous light path with no breaks, and was precisely wound around an aluminum spool with a diameter of 25 cm to form a coil.

CNR Labs

The Consiglio Nazionale delle Ricerche labs are pictured at the foot of the Monte Gauro quiescent volcano. Credit: Saverio Avino, CNR-INO

During the experiments, the optical sensor is kept in a controlled laboratory environment in a building that sits on top of a volcano caldera – a large depression formed when a volcano erupts and collapses. “This first version of the system showed a resolution comparable to other state-of-the art fiber-optic gyroscopes,” said the paper’s first author Marialuisa Capezzuto, who is from CNR-INO and worked on the experimental apparatus. “It also had a very good duty cycle—the time percentage the instrument is measuring/acquiring data —which allowed us to run the system continuously for around five months.”

“The prototype gyroscope can only measure one of the three directional components of the rotation movement. However, combining three of the same gyroscopes, each oriented to capture a different axis of rotation, could be used to capture all three components,” said Luigi Santamaria Amato from the Italian Space Agency (ASI). Once the researchers have improved the resolution and stability of the single-axis system, they plan to set up a three-axis gyroscope. Eventually, they want to create a permanent ground rotation observatory in the Campi Flegrei area.

Reference: “Fiber-optic gyroscope for rotational seismic ground motion monitoring of the Campi Flegrei volcanic area” by Paolo De Natale, Danilo Galluzzo, Marialuisa Capezzuto, Antonio Giorgini, Luigi Santamaria Amato, Roberto Manzo, Ezio D’Alema, Saverio Avino, Pietro Malara, Lucia Nardone, Guido Gaudiosi, Davide D’Ambrosio and Gianluca Gagliardi, 31 May 2024, Applied Optics.
DOI: doi:10.1364/AO.518354

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/earthquake-eyes-volcano-monitoring-gyroscope-unlocks-seismic-secrets/

Tags: earthquakescienceVolcano-Monitoring
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