Volcano Update from Archive

Wednesday, November 28, 2012 10:01 AM ChST (Wednesday, November 28, 2012 0001 UTC)

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

Observers on Saipan report that volcanic gas, most likely from Pagan Volcano, is being transported in a southerly direction resulting in hazy sky conditions over parts of the CNMI. It is possible, but not certain that residents of the CNMI may notice sulfurous odors while northerly lower-level winds prevail. Observers on Pagan Island report nothing unusual, aside from the typical gas and steam emissions that have characterized Pagan for the past several months. There have been no reports of ash emission at Pagan Volcano.

Volcanic smog, also known as Vog, is a visible haze comprised of gas and an aerosol of tiny particles and acidic droplets, created when sulfur dioxide (SO2) and other gases are emitted from the volcano. Additional information about 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.

No eruptive activity or significant unrest was detected at other volcanoes in Northern Mariana Islands this week.

USGS Northern Marianas Duty Scientist (808) 967-8815


CNMI Emergency Management Office (670) 322-8001