The use of fire has a greater risk to cause a gas explosion immediately after the disaster and even obtaining hot water fully in a container is difficult because fire is not usable at a refuge in groups.
災害直後は、火気使用はガス爆発を起こす危険も高く、集団避難生活では火気が使えないために容器一杯の熱湯を得るのも難しいケースもある。