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Session: Filling the Data Gap: Ocean-bottom Sensing with Fiber-optic Cables [Poster]

Type: Poster

Date: 10/9/2024

Time: 07:00 AM

Room: Stanley Park Ballroom

Seafloor Fiber-Optic Array in Monterey Bay (SeaFOAM) is a permanent offshore DAS deployment in Monterey Bay, California, with the purpose of seismic monitoring and beyond. We apply DAS to a 52-km long submarine cable maintained by Monterey Bay Aquarium Research Institute (MBARI), starting from August 2022. We have explored the dataset for seismic and ocean waves, subsurface structure, and relative instrument response.

We have recorded a large number of local and teleseismic events with broadband observations. A workflow has been developed to detect and characterize earthquakes in real-time for the purpose of earthquake early warning, including a machine learning-based phase picking model and an integrated methodology that synergizes DAS with traditional seismic stations onshore. We also observed scattering waves from offshore San Gregorio Fault zones and resonance effects from underwater basins. We analyzed infragravity waves recorded during strong winter storms at different water depths. A coherency analysis in frequency domain is applied to explore characterization of frequency-dependent instrument responses of individual DAS channels. We show that this unique submarine DAS array can enhance local earthquake and fault monitoring as well as offer new insights into mechanisms of both oceanic processes and ocean–solid earth interactions.

Presenting Author: Yuancong