Canie, I don't watch the volcano pages usually but do watch nws.noaa.gov and they give ashfall advisories. That drew my attention to Kasatochi, which has a bigger batch of seismicity, and is close to the big Andreanoffs swarm. But, bit close enough to that swarm that they are directly related...although related somehow would be non-surprising.

Since I don't watch volcano pages, don't know how unusual it is to have 3 in Aleutians erupting at same time. But, I have not seen ashfall advisories for 2 on the nws.
Chris

• Kasatochi volcano