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Turquoise cone description and information


Most Recent Activity:
Seismically Monitored: No
Elevation: 2110 ft (643 m)
Latitude: 54.629774° N
Longitude:164.426501° W
CAVW Number:
Nearby towns:False Pass 43 mi (70 km) NE
Akutan 64 mi (103 km) SW
Pauloff Harbor 70 mi (113 km) SE
Cold Bay 78 mi (125 km) NE
Anchorage 698 mi (1124 km) NE
From Stelling and others, 2005 [1]: "The eruptive products of Turquoise Cone are compositionally diverse, ranging from pl+ol+cpx high-alumina basalt to sparsely plagioclase-phyric dacite. The oldest deposits from Turquoise Cone are the most mafic (47 wt.% SiO2), whereas the last eruptions from this vent are the most silicic (66 wt.% SiO2). The present-day amphitheater-like form of Turquoise Cone resulted from a significant collapse event. Through geometric extrapolation of existing deposits and their inclinations, the pre-collapse volume of Turquoise Cone is estimated to have been ~3 km, and slighty more than half of that volume has been removed. No deposits from the collapse event have been recognized, and we believe that they have been buried by subsequent eruptions from Turquoise Cone and other intracaldera vents. We are thus unable to constrain the trigger or structure of the collapse."
Eruptive history of Fisher Caldera, Alaska, USA, 2005
citation imageStelling, P., Gardner, J. E., and Beget, J., 2005, Eruptive history of Fisher Caldera, Alaska, USA: Journal of Volcanology and Geothermal Research, v. 139, no. 3-4, p. 163-183.

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