There is some “small” triangular activity going on in the last few days or so. Keep in mind that the Wabash Valley Zone (in IL/IN) has been very quiet for sometime before the Friday 4/18 4:37am central time 5.2 quake (UTC 9:37am)
I find it all very interesting even if it means nothing.
Check out these 2 pages (open each one in a new window)
(one is a location map and the other is the data for the location map)
http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/US10/32.42.-90.-80.php
http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/US10/32.42.-90.-80_eqs.php (deduct 5 hours off the UTC times to get the actual Central time)
About all I can say, is that I’m glad I’m not living in that region right now. This activity may signify nothing, and then again it may be a reawakening of the fault zone.