The one in New Mexico is not that far from the WIPP, near where my Mom grew up (and a large contigent of her family still live).
http://earthquake.usgs.gov/recenteqsUS/Quakes/usgva8.htm
The Waste Isolation Pilot Plant, or WIPP, is the world's first underground repository licensed to safely and permanently dispose ofWIPP's first waste shipment received on March 26, 1999 transuranic radioactive waste left from the research and production of nuclear weapons. After more than 20 years of scientific study, public input, and regulatory struggles, WIPP began operations on March 26, 1999.
Located in the remote Chihuahuan Desert of Southeastern New Mexico, project facilities include disposal rooms minedWIPP location 26 miles southeast of Carlsbad, NM 2,150 feet underground in a 2,000-foot thick salt formation that has been stable for more than 200 million years. Transuranic waste is currently stored at sites nationwide.
Hmm, let me clean up that description a bit (img alt tags from the WIPP homepage):
The Waste Isolation Pilot Plant, or WIPP, is the world's first underground repository licensed to safely and permanently dispose of transuranic radioactive waste left from the research and production of nuclear weapons. After more than 20 years of scientific study, public input, and regulatory struggles, WIPP began operations on March 26, 1999.
Located in the remote Chihuahuan Desert of Southeastern New Mexico, project facilities include disposal rooms mined 2,150 feet underground in a 2,000-foot thick salt formation that has been stable for more than 200 million years. Transuranic waste is currently stored at sites nationwide.
Another small one (2.9) near Valentine, Nebraska.
There were also those gas geysers recently in Oklahoma.