The eruption of Mount Ontake on Saturday was the worst in postwar history, with nearly 50 people confirmed dead. And it could be some time before the full toll is known.
Dozens are reported missing, but figures vary widely and no official entity — police, fire or government — can say for sure how many bodies may lie buried amid the rocks and ash.
One reason for the lack of clarity is that only a fraction of hikers bother to notify rangers they are embarking on a trek. Although recommended, it is not mandatory to do so.