Augustine volcano lies in southwestern Cook Inlet, southcentral coastal Alaska, 280 km southwest of Anchorage. The nearly circular island is 12 km wide east-west, 10 km north-south; a nearly symmetrical central summit peaks at altitude 1254 m. From aerial photographs flows in August 1990, the U.S.Geological Survey's National Mapping Division at Vancouver, Washington, scribed a new topographic map of Augustine Island at 1:25,000 scale with a 10-m contour interval, on which a new geologic map is plotted. Geologic mapping was done in the field over 7 brief seasons between 1988 and 1995, the map data plotted on vertical aerial photographs flown in September 1986 and August 1990. Comparison with photographs flown in August 1976 helped distinguish some look-alike deposits of the 1976 and 1986 eruptions having similar distributions. From the aerial photographs the map was compiled with an analog Kern PG-2 stereoplotter.
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