In accord with JMA's precursory warnings, representatives of Komoro City decided to close the mountain hut 2 km W of the summit. The afternoon of 1 February, the resident and official observer there, Keisuke Kanda, readied the hut for closure. After that, he went to bed, planning to climb down the mountain the next morning. At the time of the eruption (0151) he neither felt nor heard any disturbance. At 0200 (about 9 minutes after the eruption began), he was awakened by his ringing cell phone.
During the eruption, Masakatsu Umeda, working in a French restaurant 7 km N of the summit, felt small but continuous shaking and saw a red plume rising from the summit crater. He heard a far softer sound than he did on 1 September 2004 but then he was 4 km NE of the summit at Rokurigahara parking lot.