Shishaldin


Facts


  • Official Name: Shishaldin Volcano
  • Seismically Monitored: Yes
  • Color Code: YELLOW
  • Alert Level: ADVISORY
  • Elevation: 2857m (9373ft)
  • Latitude: 54.7554
  • Longitude: -163.9711
  • Smithsonian VNum: 311360
  • Pronunciation:
  • Nearby Towns:
    • False Pass 23 mi (38 km) NE
    • Pauloff Harbor 55 mi (88 km) SE
    • Cold Bay 58 mi (93 km) NE
    • King Cove 69 mi (111 km) NE
    • Belkofski 80 mi (129 km) NE

Description

From Miller and others (1998) [1] : "Shishaldin Volcano, located near the center of Unimak Island, is a spectacular symmetrical cone about 16 km in diameter at the base. The mountain, which rises to a summit 2857 m above sea level, is the highest peak in the Aleutian Islands and has a small summit crater from which a steady cloud of steam is emitted. The upper 2000 m is almost entirely covered by perennial snow and ice. It is flanked to the northwest by 24 monogenetic parasitic cones [2] . The Shishaldin cone is less than 10,000 year old and is constructed on a glacially eroded remnant of an ancestral soma and shield [2] , which in turn are underlain by volcaniclastic rocks of probable late Tertiary age [3] . Fournelle (1988) [2] suggests that the basement may consist, at least in part, of plutonic rocks."

Name Origin

Tebenkov (1852) named this volcano "So[pka] Shishaldinskaya," which was later transliterated to "Shishaldin Volcano." G.A. Sarichev reported its Unangam Tunuu name as "Agajedan (Grewingk, 1850). Wagner (1937) wrote that it was named Volcan de Fernandez, by Martinez (Orth, 1971).


References Cited

[1] Catalog of the historically active volcanoes of Alaska, 1998

Miller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report 98-0582, 104 p.

[2] Geology and petrology of Shishaldin volcano, Unimak Island, Aleutian Arc, Alaska, 1988

Fournelle, J. H., 1988, Geology and petrology of Shishaldin volcano, Unimak Island, Aleutian Arc, Alaska: The Johns Hopkins University Ph.D. dissertation, 507 p., 2 plates, scale unknown.

[3] Reconnaissance geologic map of the Cold Bay and False Pass quadrangles, Alaska, 1978

McLean, H., Engelhardt, C. L., and Howell, D. G., 1978, Reconnaissance geologic map of the Cold Bay and False Pass quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-0323, unpaged, 1 plate.

Current Activity

May 24, 2024, 11:35 am

Low-level unrest continues at Shishaldin Volcano, with occasional small volcanic earthquakes and weak seismic tremor observed throughout the week, when storm-noise levels were low. Minor steaming was observed in rare clear web camera views throughout the week. No ash or sulfur dioxide gas plumes were observed.

Minor rock falls associated with collapse events from the unstable ground in and near the summit crater may generate very small clouds of fine-grained rock dust that dissipate quickly in the immediate vicinity of the summit. No significant eruptive activity has occurred since November 2023. 

Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to monitor the volcano.

Webcams

Webicorder

RSAM

Color Code Timeline