That said, it is also necessary to understand the app’s limitations. ShakeAlertLA’s warnings will be measured out in seconds — enough to allow you to pull off to the side of the road, or to get under a table, but not to do a whole lot else. The alert, after all, cannot go out until an earthquake begins; it’s triggered by a matrix of sensors.The more sensors, the quicker, or more accurate, the warning.
Source: latimes.com – Los Angeles Times