Fig. 5

Photographs of the deposits in the Akagawa and Nigorisawa Rivers. a A check dam at site A. Syneruptive-spouted type lahars deposits filled the wing of the check dam. b Syneruptive-spouted type lahar deposits on the wing of the check dam at site B, photographed by a member the Forestry Agency on October 2, 2014. The front of the deposit had a lobate form, and desiccation cracks had developed on its surface. c The main stream of the Akagawa River near site B, photographed by a member of the Forestry Agency at 11:30 am, October 2, 2014. The lahar flowing through this location at this time, as indicated by a spray of mud in the lower right corner of the photograph. d Deposit of a syneruptive-spouted type lahar that flowed into a forested area. e The syneruptive-spouted type lahar deposit over a fallen tree. f A view of the entirety of site D. The gray syneruptive-spouted type lahar deposit was covered by a dark brown debris flow deposit. f The thickness of the syneruptive-spouted type lahar deposit is approximately 30 cm, and it contains rounded boulders. h Reticular sulfur-bearing veins that developed in the lahar deposits