Volcano Update from Archive



AVO/USGS Volcanic Activity Notice

Volcano: Pavlof (CAVW #1102-03-)

Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: WATCH

Current Aviation Color Code: YELLOW
Previous Aviation Color Code: ORANGE

Issued: Tuesday, July 2, 2013, 4:11 PM AKDT (20130703/0011Z)
Source: Alaska Volcano Observatory
Notice Number: 2013/A15
Location: N 55 deg 25 min W 161 deg 53 min
Elevation: 8261 ft (2518 m)
Area: Alaska Peninsula Alaska

Volcanic Activity Summary: Over the past two days, the eruptive activity at Pavlof has greatly declined. Seismic tremor and small discrete explosions are no longer detected in seismic and pressure sensor data. Satellite observations show no evidence of elevated surface temperatures, volcanic gas, or ash emissions. There have been no visual observations from pilots or from webcam images of any eruptive activity since June 26. Consequently, the Aviation Color Code is being reduced to Yellow and the Volcano Alert Level to Advisory.

During earlier periods of the current eruption and past eruptions of Pavlof, the style of eruptive activity has fluctuated from higher to lower levels. Such a fluctuation occurred during the current eruption on May 28, when eruptive activity paused until resuming on June 4. Therefore, the current pause in eruptive activity does not necessarily indicate that the eruption has ended. Renewed activity is possible, and may not be preceded by significant seismic activity. AVO will continue to monitor Pavlof closely.

Remarks: Pavlof volcano is located on the southwestern end of the Alaska Peninsula. Pavlof is a stratovolcano which rises to an elevation of 8262 feet. With almost 40 historic eruptions, it is one of the most consistently active volcanos in the Aleutian arc. Eruptive activity is generally characterized by sporadic strombolian fountaining continuing for a several-month period. The community of Cold Bay is located 60 km (37 miles) to the southwest of Pavlof.

Contacts: John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Janet Schaefer, Acting Coordinating Scientist,
Alaska Division of Geological and Geophysical Surveys
janet.schaefer@alaska.gov (907) 451-5005

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20130703/0011Z)
(3) Volcano:Pavlof (CAVW# 1102-03-)
(4) Current Color Code:YELLOW
(5) Previous Color Code:orange
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2013/A15
(8) Volcano Location:N 55 deg 25 min W 161 deg 53 min
(9) Area:Alaska Peninsula Alaska
(10) Summit Elevation:8261 ft (2518 m)
(11) Volcanic Activity Summary:Over the past two days, the eruptive activity at Pavlof has greatly declined. Seismic tremor and small discrete explosions are no longer detected in seismic and pressure sensor data. Satellite observations show no evidence of elevated surface temperatures, volcanic gas, or ash emissions. There have been no visual observations from pilots or from webcam images of any eruptive activity since June 26. Consequently, the Aviation Color Code is being reduced to Yellow and the Volcano Alert Level to Advisory.

During earlier periods of the current eruption and past eruptions of Pavlof, the style of eruptive activity has fluctuated from higher to lower levels. Such a fluctuation occurred during the current eruption on May 28, when eruptive activity paused until resuming on June 4. Therefore, the current pause in eruptive activity does not necessarily indicate that the eruption has ended. Renewed activity is possible, and may not be preceded by significant seismic activity. AVO will continue to monitor Pavlof closely.
(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Unknown
(14) Remarks:Pavlof volcano is located on the southwestern end of the Alaska Peninsula. Pavlof is a stratovolcano which rises to an elevation of 8262 feet. With almost 40 historic eruptions, it is one of the most consistently active volcanos in the Aleutian arc. Eruptive activity is generally characterized by sporadic strombolian fountaining continuing for a several-month period. The community of Cold Bay is located 60 km (37 miles) to the southwest of Pavlof.
(15) Contacts:John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Janet Schaefer, Acting Coordinating Scientist,
Alaska Division of Geological and Geophysical Surveys
janet.schaefer@alaska.gov (907) 451-5005
(16) Next Notice:A new VONA will be issued if conditions change significantly or alert levels are modified. While a VONA is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu