ANCHORAGE, Alaska - The U.S. Geological Survey says Okmok Volcano in Alaska is producing more explosions and ash plumes.

The ash is coming through a newly created vent and poses hazards to local air travel.

Scientists are tracking the eruption with seismic and global positioning system instruments on the ground and weather and radar satellites in space.

Ash obscures a view inside the volcano's 10-kilometre-diameter crater.

The volcano in the eastern Aleutian Islands erupted unexpectedly July 12, sending up a plume that reached 15,000 metres and disrupted flights.

It sent ash down on Unalaska, a fishing community 100 kilometres to the northeast. Experts say activity at Okmok may continue for days or weeks.

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