ANSS Heliplot Question

I really know ZERO about reading these seismic graphs, but they appear to be very active across North America. Can anyone here explain what they might mean?

earthquake.usgs.gov...

I'm very curious to understand them.

a reply to: wrathofall

I'm probably wrong, but the way I read that, taking the first graph (Aleutian Islands, Alaska) as an example, with hours on the y axis and minutes on the x axis, I read:

Smaller vibrations at 7.22pm for 3 minutes, 9.25pm for 5 minutes, 9.58pm for 6 minutes and 2.53am for 4 minutes.

I also see heavier activity recorded from all locations between 2pm and 3.30pm, assuming I've interpreted it right, which I likely haven't. But I'm having a go regardless.

That was an interesting 10 minutes, nonetheless. S&F for giving me something interesting to think about for a while.

Was just about to post the same question.

Looks like the whole Earth shook.

earthquake.usgs.gov...