Illustration for article titled Japanese Volcano Violently Erupts, Sending Hikers Racing To Safety

Mount Ontake violently erupted without warning Saturday morning in Japan. Unbelievably, hikers not only survived, but recorded the pyroclastic flows racing towards them. Here's the science of what happened.

Top image: Mount Ontake eruption at 11:53 am on September 27, 2014. Credit: AP Photo/Yomiuri Shimbun/Toshihiko Kawaguchi

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