Al Gore(Alta Rock Energy Inc.) did this in Switzerland and got sued for the earthquakes it caused.
Then they tried it in N. California and encountered a geologic anomaly(oil&gas).
California quickly denied the permit for the deep fracture procedure after they learned of the Swiss lawsuit.
There are many, many active geothermal wells currently in use.
This is just for California:
ftp://ftp.consrv.ca.gov/pub/oil/maps/Geothermal/MapS-11.pdf
Man made earthquakes? About as realistic as man made global warming.