吾妻火山・一切経山 大穴火口 （2017年9月） 福島県
The Oh-ana vent of Mt. Issaikyo-san, Azuma volcano, Fukushima, Japan. Viewed from south. This active vent, with steam and sulfur exhalation at several spots, is the youngest among the Azuma volcano which has been active since 0.3 Ma. At present, relatively a calm period, only the W-6 fumarole is apparently active with sulfur deposits around it. (lower).