Logo link to homepage

Report on Pagan (United States) — 30 June-6 July 2010

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 30 June-6 July 2010
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2010. Report on Pagan (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 30 June-6 July 2010. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (30 June-6 July 2010)


Pagan

United States

18.13°N, 145.8°E; summit elev. 570 m

All times are local (unless otherwise noted)


Minor gas-and-steam plumes from Pagan continued to be observed in satellite imagery during breaks in cloud cover from 25 June to 2 July. The Washington VAAC reported that on 5 July a small cloud of ash mixed with a gas plume was observed in satellite imagery. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Geologic Background. Pagan Island, the largest and one of the most active of the Mariana Islands volcanoes, consists of two stratovolcanoes connected by a narrow isthmus. Both North and South Pagan stratovolcanoes were constructed within calderas, 7 and 4 km in diameter, respectively. The 570-m-high Mount Pagan at the NE end of the island rises above the flat floor of the northern caldera, which may have formed less than 1000 years ago. South Pagan is a 548-m-high stratovolcano with an elongated summit containing four distinct craters. Almost all of the historical eruptions of Pagan, which date back to the 17th century, have originated from North Pagan volcano. The largest eruption of Pagan during historical time took place in 1981 and prompted the evacuation of the sparsely populated island.

Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program, Washington Volcanic Ash Advisory Center (VAAC)