Jigoku Onsen in the Aso area was hit hard by the 2016 earthquakes. For a while, landslides had made it impossible to even get to the facility. Recently, however, they’ve opened for business again. They still can’t take overnight customers at the inn, but you can enjoy a nice soak in their deliciously muddy “Suzume no yu.” (“Delicious” as in “extremely enjoyable” . . . but the mud is definitely not edible ;) )
Here’s a page from Seifuso, the inn, announcing the partial reopening (English explanation included):
http://jigoku-onsen.co.jp/2019/03/17/ついに決定!%E3%80%80すずめの湯%E3%80%80再開/
And here’s a page explaining how much they charge: http://jigoku-onsen.co.jp/charge/ – Kirk
P.S. I’ve been meaning to post about this for a while. I saw some TV programs about this (including at least one that was nationally broadcast) but was a bit busy at the time.
Oh, and the main inn is scheduled to reopen next year.