University of Cambridge > > Bullard Laboratories Wednesday Seminars > Fibre-Optic Strain Sensing: A Game Changer for (Urban) Seismic Surveying

Fibre-Optic Strain Sensing: A Game Changer for (Urban) Seismic Surveying

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Natural hazard prediction and efficient crustal exploration benefit from densely designed surveys. Seismological techniques provide ground-motion data, while active seismics aims at structural imaging and increasingly on physical properties determination. Dense networks exist on some volcanoes and in exploration plays, but not in urban areas where data acquisition is more challenging. We demonstrate that dynamic strain determination is now possible with conventional fibre- optic cables deployed for telecommunication. This is a new tool for earthquake location or for crustal exploration using unexpected sources. Thereby, this method provides key records for understanding subsurface dynamics, especially in urban areas.

Relevent References: 1. Ajo-Franklin, Jonathan B., et al. “Distributed Acoustic Sensing Using Dark Fiber for Near-Surface Characterization and Broadband Seismic Event Detection.” Scientific reports 9.1 (2019): 1328. 2. Marra, Giuseppe, et al. “Ultrastable laser interferometry for earthquake detection with terrestrial and submarine cables.” Science 361.6401 (2018): 486-490. 3. Jousset, Philippe, et al. “Dynamic strain determination using fibre-optic cables allows imaging of seismological and structural features.” Nature communications 9.1 (2018): 2509.

This talk is part of the Bullard Laboratories Wednesday Seminars series.

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