Volcano Update from Archive

Wednesday, May 22, 2013 1:55 PM AKDT (Wednesday, May 22, 2013 2155 UTC)

Ugashik-Peulik Volcano
57°45'1" N 156°22'12" W, Summit Elevation 4836 ft (1474 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Ukinrek Maars Volcano

57°50'2" N 156°30'50" W, Summit Elevation 299 ft (91 m)

Current Volcano Alert Level: NORMAL

Current Aviation Color Code: GREEN

Over the past several weeks seismic instruments at Ugashik-Peulik and Ukinrek volcanoes have slowly returned to operation. These instruments are solar powered and have likely returned to operation as a result of increased solar input with the changing season. AVO is now able to seismically monitor these volcanoes and we have changed the Aviation Color Code from UNASSIGNED to GREEN and the Volcano Alert level to NORMAL.

Mount Peulik, a small stratovolcano about 10 km (6.2 mi) in diameter at the base, is located just south of Becharof Lake on the Alaska Peninsula, approximately 540 km (325 mi) southwest of Anchorage and 115 km (70 mi) south of King Salmon. The volcano partially covers the northern margin of Ugashik caldera, an older circular structure about 5 km (3.1 mi) in diameter. Peulik's summit crater - about 1.5 km (1 mi) in diameter - is breached on the west side. The only known historic eruption of Peulik occurred around 1814.

Ukinrek Maars, located 12 km northwest of Ugashik-Peulik volcanic center, are a pair of phreatomagmatic explosion vents that formed in 1977. West Maar, elliptical in shape and up to 170 m in diameter and 35 m deep, formed on the northwest end of the ridge. East Maar lies 600 m east of West Maar at a lower elevation. It is circular, up to 300 m in diameter and 70 m deep, and has a 49-m-high central lava dome.

VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu


John Power, Scientist-in-Charge, USGS

jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI

jeff.freymueller@gi.alaska.edu (907) 378-7556

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.