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Okmok volcano (Aleutian Islands, Alaska): mild to moderate ash eruptions

Thursday Jul 24, 2008 14:27 PM | Age: 4 yrs

On 19 July, activity at Okmok increased as interpreted from seismicity. Possibly, ash plumes rose to altitudes of 7.6-9.1 km (25,000-30,000 ft) a.s.l. The Volcano Alert Level was raised to Warning and the Aviation Color Code was raised to Red.
On 20 July, seismicity decreased. Satellite imagery revealed that an ash plume about 20 km from Okmok drifted SE at an altitude of 3.7 km (12,000 ft) a.s.l. Additional ash plumes observed on satellite imagery and spotted by pilots rose to altitudes of 4.6-6.1 km (15,000-20,000 ft) a.s.l.
During 21-22 July, ash plumes rose to altitudes of 6.1-9.1 km (20,000-30,000 ft) a.s.l. and drifted SE.
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(adapted from SI/USGS Weekly Volcanic Activity Report 16-22 July 2008)
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Okmok volcano (Aleutian islands), activity update: ash plume
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