By firing lasers through underground fibers, scientists can detect seismic waves and perhaps improve alerts—giving people precious time to prepare.
https://www.wired.com/story/how-fiber-optic-cables-could-warn-you-of-an-earthquake/?utm_source=dlvr.it&utm_medium=blogger
https://www.wired.com/story/how-fiber-optic-cables-could-warn-you-of-an-earthquake/?utm_source=dlvr.it&utm_medium=blogger