After all of the shakes and boom, it seems like the raspberry shake team would be a perfect to expand their product line and monitoring infrastructure to measure geomagnetism with a magnetometer.
Something like http://www.geomag.bgs.ac.uk/education/earthmag.html
There would be a few challenges such as thermal stability, nothing insurmountable.
Raspberry Aurora … waiting for it to show up on KickStarter!