Pavlof , Alaska : Seismic activity remains elevated .

Pavlof , Alaska : Seismic activity remains elevated .

The explosive eruption that began on Sunday, March 27, declined significantly the following day and has continued over the past week at a diminished level of intensity. Seismic activity remains elevated at levels above background and over the past 24 hours has been characterized by occasional small earthquakes and intermittent volcanic tremor. No ash emissions or elevated surface temperatures have been observed in cloudy satellite and web camera views over the past day.

The ash-producing energetic phase of the eruption lasted from 4 PM AKDT (00:00 UTC) on Sunday until about 12:30 PM AKDT (20:30 UTC) on Monday, and produced an ash cloud that stretched northeast over Bristol Bay and interior Alaska for over 1200 km (750 miles). Numerous pilot reports placed the top of the cloud at 30,000 to 37,000 ft above sea level, consistent with satellite data. Lava fountaining from the summit crater was observed on Sunday night by mariners, pilots, and by residents in Cold Bay, located 37 miles (60 km) to the SW.

Minor ashfall (1/32 to 1/4 in) was reported in the nearby community of Nelson Lagoon and trace ashfall (less than 1/32 in) was confirmed near Dillingham in southwest Alaska. Periods of low-level ash emission and somewhat elevated seismicity persisted overnight Monday, but decreased during the early morning hours on Tuesday. By Wednesday, the drifting, remnant ash cloud from the energetic phase of the eruption had dispersed over Alaska; however, an extensive volcanic gas cloud (sulfur dioxide) and smaller areas of volcanic ash continued to be observed in satellite data over Canada and the Northern Atlantic Ocean through today.

April 02, 2016. Pavlof , Alaska :

55°25’2″ N 161°53’37” W,
Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

 

Source : AVO

Photos : Horn, Paul (2014 ), Wilson, Brandon ( 2013 )

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