Mom Md, good catch.
At your prompting I took a look at the other webicorders(I did note the activity on the YMR earlier) and yes it is strange the amount of feedback going on. Almost every recorder has responses. Indeed there are harmonic signatures in many of the webicorders.
Interesting for that has not been the case in the past among the recorders, only when there was a certified quake.
Steve, what do you think?