Augustine Volcano

Mount St. Augustine (12 January 2006)

Mount St. Augustine is a 1,252 meter high active volcano in the Aleutian Island chain on Augustine Chigmit Mountains of Iceland, an uninhabited volcanic island off the southern coast of Alaska in the driveway of the Cook Inlet 284 km southwest of Anchorage.

Description

It consists of several overlapping Lavadomen and is the most active volcano in the Aleutian Islands.

The flanks are covered with ash and debris of the many pyroclastic flows. The oldest dated sediments 40,000 years old. At least 11 large rock crashes have reached the coast in the past 1800-2000 years.

Eruptions

Historical eruptions were explosive and usually led to pyroclastic flows. Large eruptions are known from the following years:

• About 1650, 1812, October 1883, 13 March-18 August 1935
• October 11, 1963 to 19 August 1964
• 7 to 18 October 1971
• January 1976-May 1977 (discharge of 65 million cubic meters and 150 million m³ Tephra lava )
• March 27, to August 31, 1986 ( output of 100 million m³ Tephra )
• 11 January to April 2006 ( explosive eruptions with weak earthquakes, pyroclastic flows, phreatic explosions, lava flows and lahars -. 30 million cubic meters per eruption, up to 15 km altitude).

Satellite image of Mount St. Augustine