So you want to use your Raspberry Pi unit to monitor earth’s movements? Raspberry Shake has you covered. It is a single channel geophone with an 18 bit digitizer that lets you record earthquakes from magnitude 2 and higher with a radius of 50 miles. Larger earthquakes from father away are also detectable.
Raspberry Shake comes with an ARM processor. It stores data in SEED format. The shield is compatible with all Raspberry Pi models.