http://www.sciencemag.org/news/2021/04/new-google-effort-uses-cellphones-detect-earthquakes

The magnitude 7.8 Kaikōura earthquake in 2016 ripped up highways and hillsides on New Zealand’s South Island.

Google is getting further into the business of saving lives. Today, the internet giant announced that users of its Android phones in New Zealand and Greece will receive warnings of damaging earthquakes about to strike their locations. And those earthquakes will be detected not by the usual seismometers, but by the phones themselves.