ANCHORAGE — Alaska's Mt. Redoubt continued to erupt Saturday, sending one ash plume 50,000 feet into the air.
The Alaska Volcano Observatory in Anchorage said Redoubt had a significant eruption at 1:20 a.m. Saturday and two less powerful ones in the afternoon. Ash was reported in Nikiski, a community across Cook Inlet about 50 miles from the volcano.
After the first eruption, the observatory detected strong seismic activity lasting 20 minutes or more followed by an hours-long low-level tremor.
"There are gases and venting occurring. That is likely producing the tremor," said Chris Waythomas, a geologist at the observatory.
"There is likely a lot of water vapor, which turns to ice, which gives the plumes this whitish appearance -- but there is still a lot of ash in there," he said.