Huge Explosion Rocks Alaska's Mount Redoubt

After two days of relative quiet, Alaska's Mount Redoubt volcano let loose Thursday morning with two big eruptions, the latter of which sent a cloud of ash and smoke soaring 65,000 feet into the air.

The second eruption took place about 9:24 a.m. Alaska Daylight Time (1:24 p.m. EDT), according to the Alaska Volcano Observatory.

The clould height was significantly higher than those generated by eruptions on Sunday Monday, none of which got higher than 60,000 feet.

The Anchorage Daily News reported that the National Weather Service said residents of Homer, on the southern end of the Kenai Peninsula, should expect a light dusting of volcanic ash.

It said Anchorage, Alaska's largest city, would be spared.

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On Wednesday, Mount Redoubt erupted at least twice as officials from a pipeline company assessed conditions at a nearby oil storage facility to determine whether to remove its contents.

The Cook Inlet Pipeline Co., which is partly owned by Chevron Corp., was planning to look at whether a pumping system could be used to offload 6.2 million gallons of oil stored in two tanks, if Chevron decided to remove it.

Pipeline contractor Lana Johnson said Chevron has made no decision and that an airplane runway next to the facility was covered with debris and was unusable until cleared.

"Right now, nothing can happen, because you can't bring any equipment in, because the runway is closed," Johnson said.

The small eruptions Wednesday were picked up by seismic monitors, which showed that a 10-minute blast occurred after 5 a.m. at the volcano about 100 miles southwest of Anchorage.

That eruption emitted an ash plume about 15,000 feet high that drifted to sparsely populated areas to the north and northwest, the same direction as earlier explosions since Mount Redoubt began erupting Sunday night.

A second eruption about five hours later did not emit an ash cloud detected by radar, which meant ash did not rise above 12,000 feet.

Geologists said volcano-caused mud flows and flooding would remain a hazard in the Drift River valley, where the Cook Inlet oil facility is located.

Johnson said a Tuesday assessment found no damage to the oil tanks or a cement dike around the farms but that the terminal building was flooded.

The facility had evacuated all 11 people from the site Monday.

The terminal, which was built in the 1960s by Unocal, stores oil produced from Chevron-owned oil platforms in Cook Inlet. Chevron is redirecting oil that would have been bound for Drift River to two other facilities.

The company is working on a contingency plan for when those storage facilities reach capacity, expected to be in 10 days, spokeswoman Roxanne Sinz said.

The Associated Press contributed to this report.