Volcano Update from Archive



NMI/USGS Volcanic Activity Notice

Volcano: Sarigan (CAVW #0804-192)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: UNASSIGNED

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: UNASSIGNED

Issued: Sunday, May 30, 2010, 2:07 AM ChST (20100529/1607Z)
Source: U.S. Geological Survey
Notice Number: 2010/N2
Location: N 16 deg 42 min E 145 deg 46 min
Elevation: 1765 ft (538 m)
Area: Mariana Islands

Volcanic Activity Summary: Washington VAAC reports an eruption cloud to 40,000 feet appeared in satellite images at 1230 UTC. Although the cloud appeared to be over or near Anatahan volcano in the satellite image, current evidence points to the source being an approximately 300-m-deep submarine seamount south of the island of Sarigan. According to the seismic record from an Anatahan station, the event began about 1147 UTC with the strongest phase ending at approximately 1200 UTC . The cloud may contain ash but could be largely water vapor and appears to be shrinking as northerly winds to 25 kts carry it towards CNMI and Guam. No additional volcanic clouds have been detected and it is unknown if submarine activity is continuing. Observers on Sarigan reported hearing a loud explosion from the south, and shortly thereafter receiving ash fall. They also reported the sound of a wave passing by. A SIGMET and Ash Advisory have been issued.

Contacts: USGS Northern Marianas Duty Scientist (808) 967-8815
http://volcano.wr.usgs.gov/cnmistatus.phpCNMI Emergency Management Office (670) 322-8001
http://www.cnmiemo.gov.mp/

(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20100529/1607Z)
(3) Volcano:Sarigan (CAVW# 0804-192)
(4) Current Color Code:ORANGE
(5) Previous Color Code:unassigned
(6) Source:Northern Mariana Islands
(7) Notice Number:2010/N2
(8) Volcano Location:N 16 deg 42 min E 145 deg 46 min
(9) Area:Mariana Islands
(10) Summit Elevation:1765 ft (538 m)
(11) Volcanic Activity Summary:Washington VAAC reports an eruption cloud to 40,000 feet appeared in satellite images at 1230 UTC. Although the cloud appeared to be over or near Anatahan volcano in the satellite image, current evidence points to the source being an approximately 300-m-deep submarine seamount south of the island of Sarigan. According to the seismic record from an Anatahan station, the event began about 1147 UTC with the strongest phase ending at approximately 1200 UTC . The cloud may contain ash but could be largely water vapor and appears to be shrinking as northerly winds to 25 kts carry it towards CNMI and Guam. No additional volcanic clouds have been detected and it is unknown if submarine activity is continuing. Observers on Sarigan reported hearing a loud explosion from the south, and shortly thereafter receiving ash fall. They also reported the sound of a wave passing by. A SIGMET and Ash Advisory have been issued.
(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Unknown
(14) Contacts:USGS Northern Marianas Duty Scientist (808) 967-8815
http://volcano.wr.usgs.gov/cnmistatus.phpCNMI Emergency Management Office (670) 322-8001
http://www.cnmiemo.gov.mp/