Detect Earthquakes using Fitbit

Fitness trackers are ubiquitous - I have two in my pocket right now (a Fitbit, and one built into my iPhone). They use acceleration to determine how people move, and are wonderfully precise. Also, they're often connected to the Internet, and are often precisely located in space (for instance, your phone's GPS). It's likely that in most cities there are many such devices on every block, and at any given time there must be vast numbers sitting on tables or nightstands not moving.

It's conceivable that an earthquake could be accurately analyzed using only a few of these stationary devices, and each additional device can add more resolution. Further, it's possible that if monitored in real time we could get early detection of earthquakes. An alarm can then be generated and sent out over mobile phone networks.