https://www.reuters.com/article/us-alphabet-google-quake/google-turns-android-phones-into-earthquake-sensors-california-to-get-alerts-idUSKCN2571TN

Alphabet Inc's Google's Android phones on Tuesday started detecting earthquakes around the world to provide data that could eventually give billions of users precious seconds of warning of a tremor nearby, with an alerting feature first rolling out in California.