Image: Okmok Caldera erupting on Umnak Island in Alaska
NASA via AP
This satellite image from Sunday shows  the Okmok Caldera erupting on Umnak Island in Alaska. Viewed through a break in the clouds, both a steam plume, right, and an ash plume emanate from the volcano. The steam is snowy white like the nearby clouds. The ash is slightly darker. The blue-green color of the nearby ocean water may result from volcanic ashfall.
updated 7/15/2008 8:10:07 AM ET 2008-07-15T12:10:07

A fishing vessel rescued 10 people after a volcano erupted, sending rocks and ash down on a cattle ranch on a remote island in the Aleutian Islands of Alaska.

The Tara Gaila picked up the people Saturday evening after receiving an urgent call from the Coast Guard. The fishing vessel brought them to Dutch Harbor about 65 miles away, where they were staying at a hotel on Sunday.

There were no reported injuries, said Coast Guard Petty Officer Levi Read.

The Coast Guard sent a helicopter to help out, but it had to land in Dutch Harbor because of the danger of falling ash.

It also sent two cutters to the island, located in the western Aleutians about 860 miles  southwest of Anchorage, but recalled them after the Tara Gaila responded to the emergency call.

Erupted with little warning
The 3,500-foot Okmok Caldera, which consists of a 6-mile-wide circular crater about 1,600 feet deep, erupted with little warning Saturday morning, just hours after seismologists at the Alaska Volcano Center began detecting a series of small tremors.

The explosion flung a large ash plume into the sky.

The 10 people, including three children, were at Fort Glenn, a private cattle ranch six miles  south of the volcano. The ranch residents managed to call military police on Kodiak Island using a satellite phone before losing their connection.

The volcano erupted at 11:43 a.m. and reached peak activity about two hours later, said Cyrus Read, a geophysicist with the Alaska Volcano Observatory, which has several seismic stations on the Okmok Caldera. The Okmok Caldera contains more than a dozen volcanic cones. Scientists were not sure which cone exploded Saturday.

One of the observatory's seismic stations that was placed at the rim of the volcano likely was destroyed in the explosion, Read said. Several others stations were functioning Sunday.

"It continues at this time," Read said. "It is a pretty solid plume."

Trace amounts of ash were being reported in Dutch Harbor on Saturday. There were no new reports of ash falling in the large fishing port.

Ash was expected to continue drifting south. The ash cloud was estimated at 45,000 feet on Sunday and posed a risk to aircraft.

The last time the volcano — formed about 2,000 years ago — erupted was in 1997, sending a fountain of lava and ash into the air, it was active for eight months, Read said. But he said there was no way of knowing how long the eruption would last this time.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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