Nowadays, with practically everyone having a camera in their pocket we can record natural phenomena of which we only had descriptions in the past.
Recently, I posted amazing footage of
Mount Tavurvur in Papua New Guinea erupting (fortunately recorded from a safe distance).
Below, amazing footage from Japan from the
recent eruption of Mount Ontake on the 27th of September 2014. The ash cloud is seen heading towards hikers.
The person filming this was not harmed as he was further away from
the point of eruption and hopefully he and his co-hikers won't have
breathing issues in the future because of this.
From
Wikipedia:
"There were no
significant earthquakes that might have warned authorities in the lead
up to the phreatic eruption - caused by ground water flashing to steam
in a hydrothermal explosion. The mountain is a popular tourist
attraction for hikers, being considered good for beginner climbers and
relatively safe, and the weather was also good, so there were several
hundred people on its slopes at the time."
Unfortunately, 57 people have been confirmed dead due to the eruption.