It's just good they never put 2 or 3 cities one tile away from the same volcano!
To prove that 3 cities around the same volcano is possible, I will show you this diagram, where x=land effected by volcano fallout, c=city, and v=volcano.
To prove that 3 cities around the same volcano is possible, I will show you this diagram, where x=land effected by volcano fallout, c=city, and v=volcano.
cxc
xvx
xcx
xvx
xcx