with incandescence observed in the summit crater during a time of increased seismic activity. On July 23, an active lava lake and minor spattering within the summit crater was observed. A new lava effusion event began on October 13 advancing over the next several weeks. The summit cone partially collapsed on November 25, producing a pyroclastic flow down the northwest side of the volcano and a new lava flow. On December 12, a short-lived explosion from Shishaldin expelled an ash cloud to . During late December, eruptive activity continued with lava flows and low-level explosive activity at the summit. On January 3, 2020, seismicity led to an ash cloud eruption that reached as high as . Another large ash cloud was emitted on January 19, 2020. The lava flows emitted during the eruptive events have cut deep channels in the snow and ice mantle of the volcano's north slope. The Alaska Volcano Observatory monitors the volcano for more hazardous activity with seismometers and satellite images. Due to the remote location of the volcano, visual observations are rare. Climbing The first recorded ascent of Shishaldin was in 1932, by G. Peterson and two companions. Given the straightforward nature of the climbing (Alaska Grade 1, snow up to 40 degree slope), it is possible that an earlier ascent occurred, either by native Aleuts, Russians, or other visitors. Shishaldin is a popular ski descent ( vertical) for local climbers (of whom there are few). Due to its remoteness, Shishaldin is not often climbed by outsiders. Gallery See also List of mountain peaks of North America List of mountain peaks of the United States List of mountain peaks of Alaska List of Ultras of the United States List of volcanoes in the United States Further reading Finch, Ruy Herbert, 1934, "Shishaldin Volcano: Proceedings of the Fifth Pacific Science Conference, Canada", Proceedings - Pacific Science Conference v. 3, pp. 2369–2376 Fournelle, John Harold, 1988, The geology and petrology of Shishaldin Volcano, Unimak Island, Aleutian Arc, Alaska, Ph.D. thesis Johns Hopkins University References External links Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs Alaska Volcano Observatory (Shishaldin webcam) Michael Wood and Colby Coombs, Alaska: a climbing guide, The Mountaineers, 2001. Mountains of Aleutians East Borough, Alaska Active volcanoes Stratovolcanoes of the United States Mountains of Alaska Volcanoes of Alaska National Natural Landmarks in Alaska Aleutian Range Shishaldin Holocene stratovolcanoes