Of course, the trick is that you only send the warning if there is a real earthquake, not when a truck passes. Here, the pure volume of Android phones sold plays a key role. On the first pass, the AEA can simply ignore the events that are not picked up by many phones in the same area. But we also know a lot about the tremor tremor patterns that earthquakes produce. Different waves move at different speeds, cause different types of soil movement and can be produced at different intensities as the earthquake progresses.
Thus, people behind the AEA also include a model of earthquakes and propagation of seismic waves, and check if the model observed in the accelerometers of the phones is consistent with this model. It only triggers an alert when there is a generalized telephone activity which corresponds to the expected model for an earthquake.
Awareness
In practical terms, the AEA is distributed as part of the basic Android software and is defined by default, it is therefore active in most Android phones. It is starting to monitor when the phone has been stationary for a while, checking the acceleration data in accordance with P or S waves produced by earthquakes. If he obtains correspondence, he transmits the information as well as approximate location data (to preserve confidentiality) to Google servers. The software running on these servers then performs position analysis to see if the waves are widespread enough to have been triggered by an earthquake.
In the affirmative, he estimates the size and the location and uses this information to estimate the movement of the soil which will be experienced in different places. Based on this, the AEA sends one of the two alerts, either “be aware” or “act”. The “being aware” alert is similar to a standard Android notification, but it plays a distinctive sound and is sent to users further from the epicenter. On the other hand, the “act” warning which is sent to those nearby will display one of the two messages in the appropriate language, “protect yourself” or “place, cover and hold”. He ignores all the parameters to make non -isturb, takes control of the whole screen and also plays a distinct noise.
