I can visualize a consumer oriented seismometer to record automatically the intensity, direction, and duration of an earthquake shock. The technology exists to calculate these parameters and project them on a map display of the region. A storage capability is needed to permit stepping through the last 24 hours of activity. The author has studied the mathematics of the omni-directional phased array used to calculate the magnitude and direction of a remote signal source. This background is applicable to the above device which could be built for less than $50.
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Data collected by your device can be used by the Geological Survey, when you connect the device to the Internet. It will enhance the quality of their earthquake model.
There are many resources on the Web for building inexpensive seismographs. The AS1 commercial units complete with RS232 interface is less than $500 which seems a small amount for a serious hobby.