Tracking the Trolls while you sleep.

Instrumenting faults, yes. But instrumenting an entire country would be nice. Seismic data sets used in the study of earthquakes are usually quite sparse geographically. As I understand it, this scheme is to get a large number of these critters listening for seismic events, and sending observations to some central server. Small(ish) scale passive seismic experiments like this have been run recently in California with great success in subsurface imaging. This is a good lateral application of existing technology to improve geographic receiver spread and therefore depth of imaging. After Boxing Day 2006 the more the better.

If you could combine your google map determined gps position with a distributed computing app - we could all be monitoring in lots of places simultaneously and having it centrally monitored.

If you have a newer thinkpad or macbook Stanford, UC Riverside and a couple other organizations have put out software to do just this.
http://qcn.stanford.edu/EVENTS/2008_211/

Duh... Geologists and seismic investigators have been instrumenting faults for years with accelerometers. Nothing new here, move on.....

Imagine, without this you'd be sitting at your desk wondering why your coffee cup is suddenly full of bit of plaster.