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Iliamna Volcano, USA
The north face of 3053-m-high Iliamna Volcano, one of the Cook Inlet volcanoes monitored by the Alaska Volcano Observatory, is seen in this May 6, 1986 aerial view.
Steam and volcanic gas rise from the nearly continuously active fumaroles high on the east and south flanks of the volcano.
Occasional episodes of more intense steam emission have often been mistaken for eruptive activity at Iliamna by viewers across Cook Inlet.
Iliamna is a prominent, 3053-m-high glacier-covered stratovolcano in Lake Clark National Park on the western side of Cook Inlet, about 225 km SW of Anchorage.
Its flat-topped summit is flanked on the south, along a 5-km-long ridge, by the prominent North and South Twin Peaks, satellitic lava dome complexes.
The Johnson Glacier dome complex lies on the NE flank.
Steep headwalls on the southern and eastern flanks expose an inaccessible cross-section of the volcano.
Major glaciers radiate from the summit, and valleys below the summit contain debris-avalanche and lahar deposits.
Only a few major Holocene explosive eruptions have occurred from the deeply dissected volcano, which lacks a distinct crater.
Most of the reports of historical eruptions may represent plumes from vigorous fumaroles east and SE of the summit, which are often mistaken for eruption columns (Miller et al., 1998).
Eruptions producing pyroclastic flows have been dated at as recent as about 300 and 140 years ago (into the historical period), and elevated seismicity accompanying dike emplacement beneath the volcano was recorded in 1996.
PHOTO SOURCE: Game McGimsey, 1986 (U.S. Geological Survey, Alaska Volcano Observatory), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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