Tornado Alley (PROG)

[ergo sum]

All this is of intense interest to sinkhole enthusiasts. There is, for instance, thesinkhole.org, a Web site that bills itself as “the world’s largest collection of sinkholes” and posts breezy accounts, replete with photographs, of holes in the ground. There is also the Thirteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst, known by insiders as the Sinkhole Conference, which is coming up in May. As many as 150 experts will be there presenting papers, holding discussions and looking for ways to reduce the possibility of man-made sinkholes.
http://www.nytimes.com/2013/03/16/us/after-sinkhole-death-experts-say-unwarranted-frenzy-has-ensued.html?hp