Another volcano I climbed that is currently dangerous is Popocapetl in Mexico. This volcano is east of Mexico City and I don’t remember exactly, but maybe only 50 miles away. I think that when the Pacific plate and the north american or south american plates start moving then the volcanoes and earth quakes become active.
I also climbed Popo in 1957 or 8. Made it to about 400 feet from the top, but it was quite icy there and without a rope a number of us decided not to go further. At any rate it was over 17,000 and I started feeling pretty sick. Our college group had maybe 100 people but only 10 made it past were I turned around. Earlier I had been hiking past veterans there studying on the GI bill stopping for a smoke. Most of them didn’t get near the top.
Another volcano to watch now is Sakura-Jima in Japan. It is at the Be Ready to Evacuate level, but most have left already. It is on the edge of a 15 mile wide caldera bay which blew out about 22,000 years ago. Looking at long term temperature charts, you can even see there was a visible decline in temperature around that time. Here is a webcam site showing Sakurajima and other volcanoes.
http://webcams.volcanodiscovery.com/Sakurajima