Android Earthquake Alerts Reached 16 Million Users 5.31 Seconds After 2025 Marmara Quake Onset with 90% True Positives

The AEA system leveraged the dense Android phone network for rapid detection of an offshore epicenter, outperforming traditional seismic stations in speed. Feedback surveys showed recipients performed drop-cover-hold-on actions at high rates, with timely alerts directly increasing perceived usefulness and future trust in the system. This crowd-sourced approach demonstrated how phone density can compensate for sparse instrumentation in tectonically active regions like the Marmara Sea. Analysis of precision at 99% indicates the system minimized unnecessary alerts while scaling to mass populations. Future expansions could integrate behavioral nudges to further raise compliance in near-source zones where warning windows shrink below 20 seconds.