Pavlof Sister 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 ...

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 is a satellite peak of Pavlof Volcano, lying directly northeast. The mountain was named by the USGS in 1929. It is considered dormant, as the volcano was reported to have last erupted between 1762 and 1786 although the event is questionable.Alaska Volcano Observatory, Volcano Information - Pavlof Sister Historic Eruptions
Retrieved Dec. 18, 2022. 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 ...

has the volcano alert level of Pavlof Sister set to "Unassigned", meaning the volcano is not currently monitored.Alaska Volcano Observatory, Volcano Information -- Pavlof Sister
Retrieved Dec. 18, 2022.

References

Sources

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Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs

Alaska Volcano Observatory
Volcanoes of Aleutians East Borough, Alaska Mountains of Aleutians East Borough, Alaska Stratovolcanoes of Alaska Two-thousanders of the United States Aleutian Range {{AleutiansEastAK-geo-stub