4.2 Quake Is Reported Near Northern California Geothermal Field

From this:

A magnitude 4.4 earthquake centered near the Geysers geothermal field north of Santa Rosa shook a wide area of Northern California Wednesday shortly after noon, the U.S. Geological Survey reported.

The 12:37 p.m. temblor was felt in San Francisco and was the latest of a growing number of quakes in the area. Many scientists believe the quakes are related to the injection of large quantities of waste water into the geothermal field to assist generation of steam used in electric power production.

There were few quakes in the vicinity near the Sonoma-Lake-Mendocino counties junction prior to development of the geothermal facility in the 1960s, but there have been hundreds of quakes there since then...

WTF? This is the first time I've heard of this. Somehow I don't think we should be doing things that are going to cause earthquakes, but that's just me.