Fracking Makes Earthquakes?

http://www.loe.org/shows/segments.html?programID=11-P13-00025&segmentID=4

Air Date: Week of June 24, 2011

Greenbrier, Arkansas is home to one of the world’s largest natural gas fields. It also felt a swarm of earthquakes recently. Geologists and state regulators noticed that when they capped some of the deep injection wells, the earthquakes nearly stopped. Living on Earth’s Ike Sriskandarajah reports on the future of those wells and a class-action suit that puts drilling-induced earthquakes on trial.
Transcript

GELLERMAN: Fracking is the process of using fluid chemicals under high pressure to crack open rock deep in the earth to release natural gas. It’s highly profitable - and potentially dangerous. Some environmentalists fear the ingredients can pollute underground aquifers. Most fracking companies are reluctant to disclose the chemicals they use - though Texas just announced they have to. But now comes a new worry: that wastewater from fracking injected back into the ground might trigger earthquakes. It’s already set off a class action lawsuit in Arkansas as Living on Earth’s Ike Sriskandarajah reports.

[.....] [original post has full transcript, and the radio program]

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