First time earthquake warning from USGS for OK
(broken link removed to http://earthquake.usgs.gov/regional/ceus/products/newsrelease_05022014.php)
http://thinkprogress.org/climate/2014/05/06/3434698/oklahoma-quakes-warning/
(broken link removed to http://earthquake.usgs.gov/regional/ceus/products/newsrelease_05022014.php)
http://thinkprogress.org/climate/2014/05/06/3434698/oklahoma-quakes-warning/