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St Augustine Volcano Augustine Volcano is the most frequently active and the youngest of the Cook Inlet volcanoes Detterman considered Augustine to be entirely Quaternary and Johnston concluded that volcanism at Augustine began during the late Pleistocene Moosehorn glacial advance 19000-15500 IBP Since its discovery by Captain James Cook in 1778 Augustine Volcano has had seven historical eruptions 1883 1935 1979 1985 1986 and 1987 Yount and others 1987 The activity in 1908 reported by the captain of a steamer enroute to Seward was minor and probably did not produce any deposits The 1883 eruption appears to have been the most violent historical eruption of Augustine and is thought to have generated a tsunami with wave heights of 75 to 9 m at English Bay on the Kenai Peninsula 80 km east of the Davidson Islands 1884 The tsunami has been attributed to a debris avalanche from the north side of the volcano into Cook Inlet The most recent eruption which began on March 27 1986 after more than five weeks of increased seismic activity and continued through August 1986 and is probably typical of most Augustine eruptions A nearly continuous ash-rich plume rose 3000 to 4600 m periodic explosive bursts reached altitudes of 12200 m Numerous pyroclastic flows were generated in the early stages of the eruption and moved down the north flank Several large flows reached the north shore 5 km away and entered the sea Much of the snowpack on the upper flanks melted producing lahars As the eruption evolved generation of pyroclastic flows diminished and dome building began A short lava flow also issued down a steep gully on the north flank Military and commercial air traffic was disrupted in upper Cook Inlet during the first week of the eruption when airborne ash was moving northward Light ashfall occurred over most of the Cook Inlet area and ash was detected as far north as the Brooks Range several days into
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