The earth rumbled

Another small earthquake was felt in Wichita last night.  It was a 4.3, once again centered in Oklahoma, around Medford.  Fun times!   We've actually had quite a few over the last year.  All have  been small and hardly felt, but I wonder--and so do many others what this might have to do with all the fracking going on around the area.  I've been here for 48 years, this is very unusual.