Mount Pavlof or Pavlof Volcano is a

stratovolcano A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with ...

of the

Aleutian Range The Aleutian Range is a major mountain range located in southwest Alaska. It extends from Chakachamna Lake (80 miles/130 km southwest of Anchorage) to Unimak Island, which is at the tip of the Alaska Peninsula. It includes all of the mountain ...

on the

Alaska Peninsula The Alaska Peninsula (also called Aleut Peninsula or Aleutian Peninsula, ; Sugpiaq language, Sugpiaq: ''Aluuwiq'', ''Al'uwiq'') is a peninsula extending about to the southwest from the mainland of Alaska and ending in the Aleutian Islands. T ...

. It has been one of the most active volcanoes in the United States since 1980, with

eruption A volcanic eruption occurs when material is expelled from a volcanic vent or fissure. Several types of volcanic eruptions have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has ...

s recorded in 1980, 1981, 1983, 1986–1988, 1996–1997, 2007, 2013, twice in 2014, 2016, and again in 2021-2022.Pavlof Volcano
It is not currently erupting (as of October 15, 2024). The most common lava type here is

basaltic andesite Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite. It is composed predominantly of augite and plagioclase. Basaltic andesite can be found in volcanoes around the world, including in Central Ameri ...

and the 2013-2014 lavas contained approximately 53 wt.% SiO₂. The volcano is monitored by the

Alaska Volcano Observatory The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surv ...

- a joint program of the

United States Geological Survey The United States Geological Survey (USGS), founded as the Geological Survey, is an agency of the U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on Mar ...

(USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS). With a threat score of 95,John W. Ewert, Marianne Guffanti, and Thomas L. Murray
An Assessment of Volcanic Threat and Monitoring Capabilities in the United States: Framework for a National Volcano Early Warning System.

, April 2005. the threat from future eruptions is considered to be high; much of this threat comes from the possibility of disruption of nearby air routes by large releases of ash. The mountain shares a name with the nearby Pavlof Sister, which is thought to have last erupted from 1762 to 1786, although this period of activity is sometimes attributed to Pavlof volcano instead.

Volcanic activity

After its eruption in 1996, the volcano entered a period of dormancy, the longest it had been dormant since records of its eruptions have been kept. This period ended on August 15, 2007, with the start of a new eruption involving seismic disturbances and a "vigorous eruption of lava." Scientists said that the volcano "could be working toward a massive eruption that could affect air travel but was not expected to threaten any of the towns in the area." The eruption ended on September 13. The volcano erupted again on May 13, 2013, but activity had greatly diminished by July 3, 2013, and on August 8, 2013, the Current Volcano Alert Level was reduced to NORMAL and the Current Aviation Color Code reduced to GREEN. A low-level eruption began on May 31, 2014. On June 2 seismic activity intensified and officials raised the alert level from "Watch" to "Warning" and the aviation color code from "Orange" to "Red" after pilots in the area reported an ash plume that reached as high as 22,000 feet above sea level. A new eruption began on March 27, 2016, sending an ash cloud to 37,000 feet above sea level, extending 400 miles NE. The volcano gave 25 minutes warning before the onset of the eruption. The alert level was raised to "Warning" and the aviation color code was raised to "Red", which indicates incoming eruption with high levels of ash. The nearby village of Nelson Lagoon was coated with

tephra Tephra is fragmental material produced by a Volcano, volcanic eruption regardless of composition, fragment size, or emplacement mechanism. Volcanologists also refer to airborne fragments as pyroclasts. Once clasts have fallen to the ground, ...

during the powerful eruption. The volcano stopped emitting ash clouds on March 31, 2016.

Climbing history

The first recorded ascent of Pavlof Volcano was on June 27, 1928, by T. A. Jagger, J. Gardiner, O. P. McKinley, P. A. Yatchmenoff and R. H. Stewart, although "speculation surrounds this ascent, which was recounted in ''National Geographic''."Michael Wood and Colby Coombs, ''Alaska: a climbing guide'', The Mountaineers, 2001, p. 46. The straightforward nature of the climb suggests that an earlier unrecorded ascent may have occurred. The second ascent was in June 1950 by T. P. Bank. The main challenge of climbing this peak is its remoteness and the consequent difficulty of access. The peak is a journey from the north side of Cold Bay. The climb itself is a straightforward snow climb, and the ski descent is recommended.

Gallery

File:Pavlof Volcano From Station.jpg, Pavlof 2013 eruption from space File:Map of Alaska Peninsula Volcanoes.gif, Map showing volcanoes of Alaska Peninsula

Notes

References

*
Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs

Alaska Volcano Observatory

External links