Back in 2020, Google kicked off a project to crowdsource signals from Android phones that an earthquake might be imminent. The system leveraged the accelerometers inside these devices to gather seismic data, combine it to detect patterns consistent with an earthquake, and deliver timely alerts to people who might be affected.

A 7.3 magnitude earthquake was recorded off the Alaska Peninsula on Wednesday afternoon, July 16. The U.S. Geological Survey recorded the earthquake off Sand Point, Popof Island, which is located in the center of the Alaska Peninsula,

Google's Android Earthquake Alerts system uses your phone's accelerometer to provide crucial seconds of warning before seismic activity.

A 7.3 magnitude earthquake struck near Sand Point, Alaska, on Wednesday, prompting a tsunami advisory from the National Weather Service.

Earthquake in Japan: a 3D model reveals how hidden faults raised the ground by up to 5 meters on the Noto Peninsula.

Starting in the US in 2020 and expanding internationally since, the system is called Android Earthquake Alert (AEA), and it's on by default in most Android phones. And today, Google has a paper in Science that describes how the system works,