Mount Aniakchak (Russian: Аниакчак) is a volcano on the western Alaska Peninsula. Part of the Aleutian Volcanic Arc, it was formed by the subduction of the oceanic Pacific Plate under the North American Plate. Aniakchak is a 10 kilometers (6.2 mi) wide caldera with a …

2018年8月21日 · This landscape is a vibrant reminder of Alaska's location in the volcanically active "Ring of Fire," as it is home to an impressive six mile (10 km) wide, 2,500 ft (762 m) deep caldera formed during a massive volcanic eruption 3,500 years ago. Aniakchak River poses challenges to even the most experienced river runners.

Aniakchak is a 10-km-wide summit caldera containing numerous cones, lava domes, and lava flows on the caldera floor. The largest intra-caldera cone is Vent Mountain that reaches 430 m in height and has a diameter at the base of 2.5 km.

2024年7月8日 · Surprise Lake, a 3.2-km-long lake in the northeast part of the caldera at an elevation of about 335 m is the source of the Aniakchak River, which flows through a breach in the eastern wall of the caldera.

2018年4月25日 · Aniakchak is a 6-mile-wide, 2,000-foot-deep caldera formed by the collapse of a 7,000-foot mountain. Lying inland in a region of frequent clouds and stormy weather, Aniakchak remained unknown to all but native inhabitants until the 1920s.

The national monument is centered on the 6-mile (9.7 km) diameter crater of ancient Mount Aniakchak, which was destroyed and the resulting crater formed during a caldera collapse event about 3,700 years ago.

2015年12月15日 · Aniakchak was a towering 7,000 foot tall volcano until its summit collapsed during a massive eruption about 3,700 years ago. Aniakchak and its six and half mile (10.4 km) wide caldera was unknown to all but area Natives until the 1920s. Today, few people visit this remote wilderness.

2021年11月8日 · Aniakchak was a towering 7,000 foot tall volcano until its summit collapsed during a massive eruption roughly 3,500 years ago, creating the roughly 6-mile wide Caldera. Long before this though, people had called the Alaska Peninsula and the adjacent Kodiak Island home, with the first evidence of humans dating back 9,000 years as hunters left ...

2010年5月3日 · Aniakchak is a caldera about 6.2 miles (10 km) across. Large pyroclastic flows surround the mountain. Eruptions inside the caldera have formed many vents, including tuff cones and a 3,280 ft. (1,000 m) high cinder cone.

Aniakchak National Monument and Preserve is a stark reminder of Alaska's location in the volcanic "Ring of Fire." Located on the roadless Alaska Peninsula in Southwest Alaska, 150 miles from King Salmon , this 586,000-acre monument is home to one of the world's largest calderas.