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The Quake-Catcher Network (http://qcn.stanford.edu/) has been doing this for years with laptops and USB motion detection modules. They say that laptops are less than ideal because in larger earthquake laptops bounce around and give less accurate results. Mobile phones would suffer even more from this.

I used to have QCN on my laptop (old MacBook) and the sensors were quite sensitive, to the point where it could detect footsteps a couple of feet away.

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