Don, I meant that there might be a migration on a very short time scale-like since the Alabama M 4.6 a week ago. We have 3 earthquakes posted, moving north-the one on the Missippi (M4.0), the one near New Madrid (M2.7), and the same day, the 3.2 in Illinois. 3 earthquakes is not very convincing for a migration, so we would want to look at the microquakes as well. There is almost certainly a local network at New Madrid. Maybe the easiest way to do this is to contact a seismologist working there and ask him/her to make you a plot.......Chris