SHARE Google LLC today announced it’s expanding its Android Earthquake Alerts System that uses mobile phones to both detect earthquakes and warn users to countries that don’t have early-warning alert systems. The system is currently being introduced in Greece and New Zealand, where Android users will receive automatic early-warning alerts when an earthquake is detected in their area. The early-warning alerts operate by using the accelerometers built into most Android smartphones to detect seismic waves that indicate earthquake activity. If the phone detects shaking that the software believes might indicate an earthquake, it sends a signal to the earthquake detection server, along with a location.