My general theme is that there is no physics in anything, and that includes earthquakes.
We had the upper line, and now we have the lower line. However, the locations are so bad that everything looks like a mess. We only have 'general impressions'.
I would say we are evolving to a classic 'New Madrid Mechanism' but with extension, instead of thrust. That said, there is no reason to believe this is any more of a hazard than anywhere else in the region. Clusters come and go, and there could be a big earthquake that gives no warning whatsoever.
Looking at the earthquake history, we have a big 'wipeout' earthquake for a given island every hundred years or so. This is the same as Italy, and all the regions in the area. This allows for everybody to put up piles of rock as housing. Most likely, this cluster just dies, and another one starts somewhere else. Sooner or later there will be a large earthquake.
ps I just read a Greek guy saying reational things like 'mechanisms'. I did my little happy dance.
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