Report on Pagan (United States) — 19 June-25 June 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 June-25 June 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Pagan (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 19 June-25 June 2013. Smithsonian Institution and US Geological Survey.
18.13°N, 145.8°E; summit elev. 570 m
All times are local (unless otherwise noted)
Satellite imagery showed a vigorous plume of gas and steam drifting from Pagan during periods of clear weather from 15 to 21 June. A field crew working on the island confirmed the emissions. This activity was typical of Pagan in the recent months; no ash had been detected in satellite images.
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.