Earthquake Network is a research project started in January 2013 which develops a crowdsourced Earthquake Early Warning system based on networks of smartphones. The Earthquake Network project currently involves more than 750’000 people all over the world and the network has so far detected more than 840 earthquakes in real time. For all the technical details please visit the Science section, the Bulletin of the Seismological Society of America journal or the Wikipedia page of the project.
The idea is to use the accelerometer on-board smartphones to detect in real-time the shaking induced by an earthquake. When an earthquake is detected, a warning is issued toward all the smartphones in the network. If you are not too close to the epicenter, you can receive the alert in advance and you can take cover before you are reached by the damaging waves of the earthquake.
To be part of the network and to receive the real time alerts, please install the Earthquake Network app from Google Play.