Volcano Update from Archive

Friday, January 25, 2013 11:09 AM ChST (Friday, January 25, 2013 01:09 UTC)

Report prepared by the U.S. Geological Survey.

18°7'48" N 145°48' E, Summit Elevation 1870 ft (570 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Steam and gas emissions were observed in some clear satellite views of Pagan during the past week. The USGS received no further reports of unrest or activity at Pagan volcano.

It remains possible that residents of the CNMI may notice sulfurous odors under certain wind conditions. Additional information about volcanic gas and vog can be found at: http://hvo.wr.usgs.gov/hazards/FAQ_SO2-Vog-Ash/main.html

Pagan Volcano is not monitored with ground-based geophysical instrumentation and the only sources of information are satellite observations and occasional reports from observers who pass by or visit the island. We will continue to evaluate satellite imagery, on-island, and mariner reports when they become available, but because the volcano is not monitored with ground-based instruments, we cannot provide advanced warning of activity.

Access to the island may be restricted by the CNMI government. Contact the EMO for the latest information.

18°46'12" N 145°40'12" E, Summit Elevation 3166 ft (965 m)
Current Volcano Alert Level: UNASSIGNED
Current Aviation Color Code: UNASSIGNED

In a satellite image from January 22, NOAA's Washington Volcanic Ash Advisory Center spotted a possible volcanic plume from Agrigan. Neither USGS nor NOAA have received confirmation of a volcanic source for this anomaly and it is likely the cloud was weather-related.

Agrigan, the next island volcano north of Pagan, is a stratovolcano truncated by a mile-wide caldera. The only known eruption in 1917 was a significant explosive event that buried a village in more than three feet of ash. There are no ground-based monitoring instruments on Agrigan.

USGS Northern Marianas Duty Scientist (808) 967-8815

CNMI Emergency Management Office (670) 322-8001