The Android Earthquake Alert (AEA) started in 2020 and is on by default with most Android phones. By utilizing the built in accelerometers Google has developed a global network for earthquake detection.
This is a clever and use of resources. Earthquakes and (earthquake-like events) happen in almost every region. Most detection systems are, rightfully, concentrated along tectonic hotspots.
Learn more from arstechnica:
If you’re the owner of an Android phone and live in a seismically active region, there’s a chance your phone has popped up an unusual warning. Not one that asks for permission to share personal information, or potential malware, but something far more serious: There’s an earthquake nearby, and you have up to a minute or two to get to a safer location.
In practical terms, AEA is distributed as part of the core Android software, and is set to on by default, so it is active in most Android phones. It starts monitoring when the phone has been stationary for a little while, checking for acceleration data that’s consistent with the P or S waves produced by earthquakes. If it gets a match, it forwards the information along with some rough location data (to preserve privacy) to Google servers. Software running on those servers then performs the positional analysis to see if the waves are widespread enough to have been triggered by an earthquake.
Reported on from the Science journal Global earthquake detection and warning using Android phones
and more from Google: How Android Earthquake Alerts System Works
LSM303 Accelerometer + Compass Breakout
The LSM303 breakout board combines a magnetometer/compass module with a triple-axis accelerometer to make a compact navigation subsystem. The I2C interface is compatible with both 3.3v and 5v processors and the two pins can be shared by other I2C devices. Combined with a 3-axis gyro such as the L3GD20, you have all the sensors you need for a complete IMU (Inertial Measurement Unit) for use in aerial, terrestrial or marine navigation.
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