Back in 2016, Ars reported on an interesting use for the bundle of sensors we carry around every day in our smartphones—earthquake detection. The accelerometers in your phone make a passable-enough seismometer, and together with location data and enough users, you could detect earthquakes and warn users as the shocks roll across the landscape. The University of California-Berkeley, along with funding from the state of California, built an app called “MyShake” and a cheap, effective earthquake detection network was born, at least, it was born for people who installed the app.
