United States · Lava dome
Augustine Volcano
Augustine
- Type
- Lava dome
- Elevation
- 1218m
- Last eruption
- 2006
- Type
- Lava dome
- Country
- United States
- Region
- North America / Alaska Peninsula Volcanic Arc
- Elevation
- 1218m
- Coordinates
- 59.363, -153.435
- Last eruption
- 2006
- Tectonic setting
- Subduction zone / Continental crust (> 25 km)
- Landform
- Composite
- Major rock type
- Andesite / Basaltic andesite
Geological summary
Augustine volcano, rising above Kamishak Bay in the southern Cook Inlet about 290 km SW of Anchorage, is the most active volcano of the eastern Aleutian arc. It consists of a complex of overlapping summit lava domes surrounded by an apron of volcaniclastic debris that descends to the sea on all sides. Few lava flows are exposed; the flanks consist mainly of debris-avalanche and pyroclastic-flow deposits formed by repeated collapse and regrowth of the summit. The latest episode of edifice collapse occurred during Augustine's large 1883 eruption; subsequent dome growth has restored the edifice to a height comparable to that prior to 1883. The oldest dated volcanic rocks on Augustine are more than 40,000 years old. At least 11 large debris avalanches have reached the sea during the past 1,800-2,000 years, and five major pumiceous tephras have been erupted during this interval. Recorded eruptions have typically consisted of explosive activity with emplacement of pumiceous pyroclastic-flow deposits followed by lava dome extrusion with associated block-and-ash flows.
From Wikipedia
Augustine Volcano is a stratovolcano in Alaska consisting of a central complex of summit lava domes and flows surrounded by an apron of pyroclastic, lahar, avalanche, and ash deposits. The volcano forms Augustine Island, colloquially called Mount St. Augustine, in southwestern Cook Inlet in the Kenai Peninsula Borough of southcentral coastal Alaska, about 70 miles (113 km) west of Homer and about 175 miles (282 km) southwest of Anchorage.
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Eruption history
22 recordedGlossaryDetailed timeline
- 2005VEI 3Observed2005-12-09 – 2006-04-27
- 1986VEI 4Observed1986-03-27 – 1986-08-31
- 1976VEI 4Observed1976-01-22 – 1977-05-14
- 1971VEI 1Observed1971-10-07 – 1971-10-08
- 1963VEI 2Observed1963-10-11 – 1964-08-19
- 1935VEI 3Observed1935-03-13 – 1935-08-18
- 1908VEI 1Observed1908-07-02 – end unknown
- 1883VEI 4Observed1883-10-06 – 1884-07-02
- 1812VEI 3Observed1812-07-02 – end unknown
- 1650 (±100 yrs)VEI ?Geological estimate1650 – end unknown
- 1540 (±100 yrs)VEI 4Geological estimate1540 – end unknown
- 1230 (±50 yrs)VEI ?Geological estimate1230 – end unknown
- 930 (±150 yrs)VEI ?Geological estimate930 – end unknown
- 570 (±150 yrs)VEI ?Geological estimate570 – end unknown
- 340 (±40 yrs)VEI ?Geological estimate340 – end unknown
- 120 BCE (±40 yrs)VEI ?Geological estimate120 BCE – end unknown
- 310 BCE (±100 yrs)VEI ?Geological estimate310 BCE – end unknown
- 350 BCE (±200 yrs)VEI ?Geological estimate350 BCE – end unknown
- 1820 BCE (±300 yrs)VEI ?Geological estimate1820 BCE – end unknown
- 2040 BCE (±300 yrs)VEI ?Geological estimate2040 BCE – end unknown
- 4150 BCE (±100 yrs)VEI ?Geological estimate4150 BCE – end unknown
- 5420 BCE (±50 yrs)VEI ?Geological estimate5420 BCE – end unknown
Nearby volcanoes
External links
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