Chris, I'm not sure I'd qualify anything below a M7.0 for Antipodal
activity. No hard data on this just circumstantial.

As for the volcanic activity, it takes a while to fill up a volcanic
reservouir under a volcano. And for volcanic activity, I think this
is just barely in the Mar 28th Sumatran quake antipodal window. Besides
they don't have an operational seimograph on the Islands.

It was me that posted before on antipodal quakes after the M8.7 Sumatran.
As usual I was wrong.

Dennis