It appears to be relatively mild, which I find to be a relief. Asama is a gorgeous cinder cone and it would be sad to see its proportions distorted by a significant eruption. In addition, Karuizawa sits on its slopes. I've had a fondness for the town dating from my Initial D days (Karuizawa sitting at the top of Usui Pass), in addition to being concerned for Igarashi's family, who I believe still reside in Karuizawa.
In only remotely related news, it looks like GUYS Japan is getting a new airport. The Yokota base area was used as a shooting location for some of the external scenes of the Phoenix Nest, most notably the hill George and Mirai are sitting on when chatting in ep. 45.
I am Genba Girl: behold my terrible knowledge.