...escape gets blocked, possibly by a lava dome or a viscous magma that increases the power from beneath, said observatory geologist Jennifer Adleman. "Its pressure keeps building and building," she said. Depending on the winds, the ash...

...spit massive geysers of water, gas and debris 25,000 feet into the air, according to Jennifer Aldeman, an observatory geologist. She said the increased activity of the volcano could be a signal that even more powerful bursts are coming...