Overview
- A powerful seismic doublet struck Venezuela's north-central coast on June 24, reported as magnitudes 7.2 and 7.5 and causing strong shaking and widespread panic.
- Google says its Android Earthquake Alerts System detected the quake's early P‑waves and dispatched the first notifications about nine seconds after the event began underground.
- Those alerts reached an estimated 11.4 million people in Venezuela and in some cases arrived up to about two minutes before stronger shaking hit, according to Google and news reports.
- The system uses accelerometers in stationary Android phones to spot P‑wave signatures, anonymizes and aggregates those signals, and triggers warnings when enough matching reports appear; it is enabled by default in supported countries and runs on about 2.5 billion devices.
- The alerts provide seconds-to-minutes of preparation but do not predict quakes, require phones to be still and usually need magnitude around 4.5 or higher to trigger, and are meant to complement, not replace, traditional seismic networks such as the USGS ShakeAlert.