Volcano Update from Archive

Friday, August 16, 2013 8:24 AM ChST (Thursday, August 15, 2013 22:24 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

Low-level unrest continues at Pagan Volcano with tremor and small discrete earthquakes observed in seismic data. A small explosion with a relatively high amplitude seismic component and small infrasound component occurred on Sunday (2013-08-11 14:10 UTC) at about midnight Saipan time. Interpretation of seismic and infrasound data suggest that about 30 seconds after onset of the event, increased degassing occurred. A robust steam and gas plume was visible in satellite images during periods of clear weather over the past week and from web camera images from Pagan Island. This activity is typical of recent months of observation of Pagan.

Emission of volcanic gas from Pagan may be noticed by individuals downwind of the volcano as distinctive sulfurous odors. Additional information about volcanic gas and vog can be found online at this address: http://hvo.wr.usgs.gov/hazards/FAQ_SO2-Vog-Ash/main.html

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