Standing in steaming acid water (pH 1 to 2) with horizontally driven sleet - a hot and cold start to the tour in Kyushu, Japan.
Members of the tour group in the alunite zone on the margins of the Kuju Iwo-yama active high sulphidation, high temperature fumarolic field.
This was the first of the three active hydrothermal areas visited on the first day. The other two were the Komatsu-ike steaming ground where magmatic, high sulphidation hydrothermal acitivity is progressing in a low sulphidation hydrothermal field adjacent to the Hatchobaru geothermal power plant, and the argillic alteration zone adjacent to the low sulphidation geothermal power plant.
Photograph by Mike Porter