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Iliamna Volcano description and information

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Official Name: Iliamna Volcano
Type:Stratovolcano
Most Recent Activity:March 1, 1953
Seismically Monitored: Yes
Color Code:GREEN
Alert Level:NORMAL
Elevation: 10016 ft (3053 m)
Latitude: 60.0319° N
Longitude:153.0918° W
Quadrangle:Lake Clark
CAVW Number:313020
Pronunciation: Sound file
Nearby towns:Pedro Bay 39 mi (63 km) SW
Port Alsworth 43 mi (70 km) NW
Anchor Point 47 mi (76 km) SE
Happy Valley 47 mi (76 km) SE
Anchorage 135 mi (218 km) NE
Description
From Miller et al (1998): "Iliamna volcano is a broad, deeply dissected and highly altered, roughly cone-shaped mountain at the north end of a 5-km-long ridge trending N10W. Most of the volcano is covered by perennial snow and ice and numerous glaciers radiate from the summit area. Large avalanche deposits occur on the flanks of the volcano, particularly down the Umbrella Glacier on the southwest side of the volcano.

"The volcano is a typical composite stratovolcano composed of interbedded andesite lava flows and pyroclastic rocks. Steep, inaccessible 600-m-high headwalls along the southern and eastern flanks extend nearly to the summit exposing a cross section of the volcanic stratigraphy.

"Iliamna is built on a basement of Jurassic granitic rocks of the Aleutian Range batholith (Detterman and Hartsock, 1966) that are juxtaposed against older, Lower Jurassic lava flows and pyroclastic rocks by the Bruin Bay fault, which lies several kilometers east of the summit."

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Page modified: September 24, 2013 14:10
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