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Abstract

Summary

The safety of CO2 storage operations requires the implementation of suitable monitoring techniques to evaluate conformance and containment of the storage process. The present research focuses on the NL (Northern Lights) case study (offshore Norway), aiming to assess the advantages of utilizing fiber optics in comparison to an array of land-based sensors (HNAR: HolsNoy Array and NNSN: Norwegian National Seismic Network). The investigation revealed that fiber optic cables demonstrate promising capabilities for seismic monitoring. The experiment demonstrated the sensitivity of standard telecommunications fiber optic cables deployed at the seabed for passive seismic (DAS) monitoring systems. The fiber optic system successfully detected earthquakes with magnitudes between 0.5 and 2.2 up to 200 km from the cable, and 10 times more earthquakes than onshore sensors during a period exceeding one month, showcasing its robustness in seismicity detection. Signal processing techniques, including denoising procedures, were found to be crucial for enhancing the signal-to-noise ratio and accurately detecting small seismic events. Furthermore, the fiber optic cables enabled superior earthquake location accuracy when compared to onshore sensor arrays alone.

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/content/papers/10.3997/2214-4609.202321016
2023-11-14
2025-07-20

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References

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/content/papers/10.3997/2214-4609.202321016
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Capabilities of Fiber Optics Deployed at Seabed for Microseismic Monitoring: Northern Lights Case Study
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202321016
/content/papers/10.3997/2214-4609.202321016
/content/papers/10.3997/2214-4609.202321016
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