There have been quite a few M2.5+ quakes in Arkansas the last week; the first 2 were on New Madrid seismicity lineaments, but the last few, including the 4.2 a little while ago, are a separate swarm not aligned with New Madrid.

But, the thought occurs that the next New Madrid-type quake may not be on the faults that broke in 1811-1812. Actually, that is my opinion, despite the record of repeated liquefaction events about every 500 years.

I'd like to know more about this Arkansas cluster, and also some of the Oklahoma quakes. But, I'm not motivated enough to dig up the information.

Chris

• M4.2 Arkansas