SEE RECENT COMMENTS for info on many quakes and crazy Mammoth Lakes, CA quake swarm.
Mary Greeley has this –
LINK – http://youtu.be/yO6Gw5paGTw
Wall St. Journal – Japan Eruption Shows Difficulty Predicting Action
Experts Say Saturday’s Explosion Had Few Precursory Signs
“…. Other experts agree, and speculate that Saturday’s eruption was phreatic, meaning it was a steam driven explosion that doesn’t involve fresh magma. This also meant typical signs like volcano deformation or significant seismic rattling associated to magma movement weren’t detected.
By the time the agency raised the alert level on a scale of five for Mount Ontake from one to three, which restricts entry to the mountain, it was 12:36 p.m., 44 minutes after the eruption sent plumes of toxic volcanic ash and rock into the air and hikers running for their lives….”