Interesting article.

Also they have another on the Geysers Geo-thermal Ops. See link.

"We're using several approaches to understand the history and present characteristics of The Geysers reservoir, which will help us predict performance there," says Lippmann. "For example, we use an array of digital seismometers to measure the micro-earthquakes that occur when steam is extracted or water is injected."
"

Steam extraction triggers micro-eqs....

• Geysers - energy source / quake maker