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124 km distant 14 km altitude ALASKA ERUPTIONS Alaska Volcano Observatory andesite ash fall ash plume ash to large AST on June August 18 eruption avalanches of hot basaltic-andesite stratocone beneath Crater Peak C.A. Gardner C.A. Neal caldera Chakachatna River closed for 20 coarse COOK INLET crater approximately 800 Crater Peak erupted CRATER PEAK MT crater rim ejecta clasts erupted in 1953 eruption column ERUPTIONS OF 1992 fallout flank of Crater form debris flows Fragmental debris varying fumarole geophone hot debris flowed June 26 revealed June 27 eruption km due west lahars lapilli lobate tongues magma stored beneath meters number particle masks Peak again erupted Peak erupted explosively Photograph Credit preeruption pyroclastic flow deposits R.G. McGimsey Redoubt Volcano satellite vent perched seismicity seismometer September 16-17 eruption silicic-andesite dome complex snow to form south flank Spurr stratovolcano summit crater approximately T.P. Miller tephra cloud U.S. Geological Survey vesicular volcanic bombs warm lake