I would not have guess that the first two in this sequence were foreshocks because
the area is not known for foreshock (or aftershock activity). Then when the second
set of two occurred, I thought it was over as well. Then when the two happened today,
it looks like the end, but it is also possible that a new fault is trying to open up in
the area. Swarms like this tend to be associated either with a new fault trying to
rupture or with volcanism. Either are possible in this region so, as Don says all
we can do is sit back and put our feet up ....