Google used its Android phone network's accelerometers as mini-seismometers

- Google has turned Android phones into a crowdsourced earthquake detection network. Because phones contain accelerometers (the chips that detect motion for screen rotation and step counting), they can act as mini-seismometers. - When an Android phone detects shaking consistent with an earthquake, it sends a signal to Google's server, which triangulates the data from many phones to quickly identify the quake's epicenter and magnitude — often faster than traditional seismological stations. - The system is part of Android Earthquake Alerts, launched in 2020. It provides early warnings to users in affected areas, giving them seconds to take cover. This is possible because radio signals travel faster than seismic waves. - The post you're reading suggests Google may have used this same phone network for a different purpose — potentially surveillance or monitoring unrelated to earthquakes — raising privacy and trust concerns. The key tension: the same infrastructure that saves lives could theoretically be repurposed.