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Alaska Volcano Observatory

Augustine description and statistics

Augustine Links
Type:Central domeA steep-sided mass of viscous (doughy) lava extruded from a volcanic vent (often circular in plane view) and spiny, rounded, or flat on top. Its surface is often rough and blocky as a result of fragmentation of the cooler, outer crust during growth of the dome. cluster
Most Recent Activity:December 2005
Seismically Monitored: Yes
Current Color Code:GREEN
Distance: 171 mi (275 km) from Anchorage
Elevation: 4134 ft (1260 m)
Latitude: 59.3626° N
Longitude:153.435° W
Quadrangle: Iliamna
CAVW Number:1103-01-
Sample Image: thumbnail

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Location Map:
Pronunciation:pronunciation Sound file
Augustine Volcano
St. Augustine volcano
St. Augustine, Mt.
Chinabora, Mt.
Pilon D'Azucar
Pan de Azucar
Pilon de Azucar
St. Augustin, Mt.
San Augustine, Mt.
From Miller et al (1998): "Augustine Island, an 8 by 11 km island in lower Cook Inlet, is composed almost entirely of the deposits of Augustine Volcano. Jurassic and Cretaceous sedimentary strata form a bench on the south side of the island and are overlain by granitoid glacial erratics and volcanic hyaloclastites. The volcano consists of a central dome and lava flow complex, surrounded by pyroclastic debris. The irregular coastline of Augustine Island is due to the repeated catastrophic collapse of the summit dome, forming debris avalanches down the flanks and into Cook Inlet. At least 11 avalanches have occurred in the past 2000 years with an average recurrence interval of about 150-200 years (Beget and Kienle, 1992; Beget, 1986).

"Augustine lies within the area of uplift resulting from the 1964 Alaska earthquake; 30-33 cm of uplift was measured on the northwest side of the island (Detterman, 1968). A 25-meter-high, south-facing submarine scarp 3 km south of the island, of similar orientation to joint sets in sedimentary rocks of the Kamishak River area (on the Alaska Peninsula), is almost certainly of tectonic origin."

Contact Information: AVO Web Team