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Mount Okmok topographic map
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Mount Okmok
After a period of quiescence, an intense eruption took place at Okmok in 43 BCE. A rhyodacitic eruption column rose over the volcano from a vent in its northern part. Pumice lapilli fell out from the eruption column. The fallout was emplaced in three distinct units, with a brief break between the first two that lasted days to months. The fallout deposits are up to a meter thick, with the first unit being emplaced north and the second and third units southeast of Okmok. Then, a change in magma composition from dacite to andesite heralded a dramatic increase of activity. A 200–600 °C (392–1,112 °F) hot pyroclastic flow descended the slopes of Okmok, burning the vegetation buried by the preceding fallout, and traversed ridges and topography. The flow consisted of one dense basal portion and a less dense overriding cloud. The flow deposits are tens of meters thick and contain black scoria, lithics, crystals, and glass. Some flows crossed the 8 kilometers (5.0 mi) wide sea between Umnak and Unalaska to form deposits on the latter, probably on top of pumice rafts. The flows on Umnak form two facies, one stratified and one massive, depending on local topographic conditions. It is probably at this point that the collapse of the second caldera commenced. The eruption probably took place early in the year, but with the mountain largely snow-free, which may imply a long duration.
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About this map
Name: Mount Okmok topographic map, elevation, terrain.
Location: Mount Okmok, Unorganized Borough, Alaska, United States (53.46763 -168.17881 53.46773 -168.17871)
Average elevation: 713 m
Minimum elevation: 397 m
Maximum elevation: 1,098 m
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Kiska Island
United States > Alaska > Unorganized Borough
Renamed "Skira", the island was used as the setting for the Codemasters video game Operation Flashpoint: Dragon Rising. The fictionalized version of the island is relocated closer to Russia and China, but the island's topography is replicated almost exactly.
Average elevation: 40 m
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Umnak Island
United States > Alaska > Unorganized Borough
Umnak, the third largest of the Aleutian Islands after Unimak and Unalaska, lies in the Fox Islands of the Aleutian Islands of the Bering Sea, to the southwest of the larger island of Unalaska. It is approximately 70–72 miles (113–116 km) in length (117 kilometres (73 mi)) and 16 miles (26 km) wide on…
Average elevation: 64 m
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United States > Alaska > Unorganized Borough > Saint George
Average elevation: 24 m
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United States > Alaska > Unorganized Borough > Diomede > Diomede
Average elevation: 160 m
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United States > Alaska > Unorganized Borough
Glacier Bay is covered with 1,375 square miles (3,560 km2) of glaciers which accounts for 27% of the Park area with most glaciers originating in mountains with elevation range of 8,000–15,000 feet (2,400–4,600 m). There are over 50 named glaciers (both tidewater and terrestrial glaciers); 10 tide water…
Average elevation: 402 m
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Kiska Island
United States > Alaska > Unorganized Borough
Renamed "Skira", the island was used as the setting for the Codemasters video game Operation Flashpoint: Dragon Rising. The fictionalized version of the island is relocated closer to Russia and China, but the island's topography is replicated near-exactly, with elements of the game designed around it, instead…
Average elevation: 40 m
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United States > Alaska > Unorganized Borough
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Average elevation: 217 m
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Glacier Bay
United States > Alaska > Unorganized Borough
Glacier Bay is covered with 1,375 square miles (3,560 km2) of glaciers which accounts for 27% of the Park area with most glaciers originating in mountains with elevation range of 8,000–15,000 feet (2,400–4,600 m). There are over 50 named glaciers (both tidewater and terrestrial glaciers); 10 tide water…
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United States > Alaska > Unorganized Borough
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United States > Alaska > Unorganized Borough
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