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September 10, 2025

Preliminary Analysis of Distributed Acoustic Sensing (DAS) Data Using a Submarine Fiber-Optic Cable Across the North Anatolian Fault

Key Points

DAS data significantly improves earthquake detection capabilities using fiber-optic cables along fault lines.
Seismic data from the North Anatolian fault indicates both local and teleseismic events derived from DAS monitoring.
This method utilizes submarine optical cables, which are underrepresented in current DAS applications and research.
The study provides detailed seismic waveform analysis that underscores the potential for future seismic monitoring strategies.

Abstract

Abstract Distributed acoustic sensing (DAS) is an emerging technique that uses fiber-optic cables to detect ground vibrations. DAS can record vibrations similarly to a dense network of seismic stations, aiding earthquake detection and the analysis of subsurface structures. Although terrestrial DAS setups are relatively accessible, there are few submarine optical cables available for use. As a result, most DAS data currently come from terrestrial cables. We started monitoring earthquakes using a communication cable that crosses the North Anatolian fault in the Marmara Sea for the first time. This cable crosses a bay that contains a trench that is related to deformation along the North Anatolian fault, creating a unique and complex observational environment. We present overviews of seismic data from local, regional, and teleseismic events retrieved using the new DAS system and make these data publicly available. The analysis of waveforms from nearby seismic stations and DAS instruments highlights the potential seismic applications of DAS data in the Marmara Sea.

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