What kind of volcano is aniakchak?
Stratovolcano
Aniakchak Peak description and information
| Official Name: | Aniakchak Peak |
|---|---|
| Type: | Stratovolcano with summit caldera, intracaldera domes, cones, and vents |
| Most Recent Activity: | May 1, 1931 |
| Seismically Monitored: | Yes |
| Color Code: | GREEN |
When did aniakchak last erupt?
June 1931
Mount Aniakchak
| Aniakchak Caldera | |
|---|---|
| Volcanic arc/belt | Aleutian Arc |
| Last eruption | May to June 1931 |
| U.S. National Natural Landmark | |
| Designated | November 1967 |
Is aniakchak volcano active?
At least 40 explosive eruptions have been documented from Aniakchak during the past 10,000 years, making it the most active volcano of the eastern Aleutian arc.
How was the aniakchak crater formed?
The dominant landform of Aniakchak National Monument and Preserve is the large Aniakchak Crater. The crater was formed during an eruption 3,660 ± 70 cal. yr BP and contains younger volcanic features, the latest of which formed during an eruption in 1931.
When was Paricutin volcano created?
1943
From Foshag and Gonzalez-Reyna (1956). Rarely do volcanologist get to watch the birth, growth, and death of a volcano. Paricutin provided such an opportunity. The eruption that created Paricutin began in 1943 and continued to 1952.
How old is the Aniakchak volcano in Alaska?
One of the most dramatic calderas of the Aleutian arc, the 10-km-wide Aniakchak caldera was formed around 3400 years ago during a voluminous eruption in which pyroclastic flows traveled more than 50 km north to the Bering Sea and also reached the Pacific Ocean to the south.
How old is the caldera of Mount Aniakchak?
Mount Aniakchak is a 3,700-year-old volcanic caldera approximately 10 kilometers (6 mi) in diameter, located in the Aleutian Range of Alaska, United States. Although a stratovolcano by composition, the pre-existing mountain collapsed in a major eruption forming the caldera.
How big is the lake on Mount Aniakchak?
Ancient Surprise Lake drained catastrophically before about AD 1000. (Surprise Lake (Aniakchak’s crater lake) is now about 2.75 km2 (680 acres) in area and up to 19.5 m (64.0 ft) deep.) Before or immediately after this draining, explosive eruptions of andesitic magma produced a cluster of three tuff cones in the southeast part of the caldera.
What kind of material is Mount Aniakchak made of?
Geological history. Mount Aniakchak was previously a glacially eroded stratovolcano of andestic composition, with a pre-caldera volume of 75 cubic kilometres (18 cu mi). Andesitic material in the volcano included basalt and dacite.