go to this URL http://mbmgquake.mtech.edu/earthworm/wavef_disp/welcome.html it is a earthquake thingy
yea.. it's Helicorder Images, a way to record the earthquake in a given area.. even it is minimum. for reading of this, you need to do a bit study. surf the net, also go here:
During the 1960's, Shell Chemical Co dug a well (12,500 ft deep) to dispose of toxic waste water at the Rocky Mountain Arsenal at Denver, CO. The volume of waste water injected into the well  lubricated the layers of subterranean rock enough that it created small earthquakes. Some registering 3.5, and several hundred in number.