St. Augustine Island Volcanoe - Interesting Facts?

Question

I am doing a report on the Saint Augustine Island Volcanoe in Alaksa, USA for my science class... I have searched many sites including USGS and VolcanoeWorld and am yet to find interesting facts... Please list here or send a link, Thank you very much,
Tyash93

Also ... Know I Am NOT Asking You To Do My Homework. I Have ALL The Needed Information!

Thanks For Your Answer(s) It Helped Alot But I Am Not Choosing As Best Answer Yet As More Information May Come,
Thank You

Answer 1

"Augustine Island, an 8 by 11 km island in lower Cook Inlet, is composed almost entirely of the deposits of Augustine Volcano. Jurassic and Cretaceous sedimentary strata form a bench on the south side of the island and are overlain by granitoid glacial erratics and volcanic hyaloclastites. The volcano consists of a central dome and lava flow complex, surrounded by pyroclastic debris. The irregular coastline of Augustine Island is due to the repeated catastrophic collapse of the summit dome, forming debris avalanches down the flanks and into Cook Inlet. At least 11 avalanches have occurred in the past 2000 years with an average recurrence interval of about 150-200 years (Beget and Kienle, 1992; Beget, 1986).
"Augustine lies within the area of uplift resulting from the 1964 Alaska earthquake; 30-33 cm of uplift was measured on the northwest side of the island (Detterman, 1968). A 25-meter-high, south-facing submarine scarp 3 km south of the island, of similar orientation to joint sets in sedimentary rocks of the Kamishak River area (on the Alaska Peninsula), is almost certainly of tectonic origin."
Mt.St. Augustine is a calc-alkaline Quaternary volcano, situated within Cook Inlet, Alaska.^The island is composed of low- to medium-K andesite and dacite domes and pyroclastic flows. Major element variations indicate the magmatic evolution is dominantly influenced by fractionation and magma-mixing processes.^Incompatible element and isotopic compositions suggest that despite its continental location, crustal assimilation is not significant factor in magmatic evolution.^Alkali contents for Augustine are generally lower than elsewhere in the Aleutians
History is as follows:
Augustine is part of the Aleutian volcanic arc and is made of several lava domes and steep, short lava flows. Debris avalanches form an apron around the volcano and indicate repeated collapse of the central domes. Many of the debris avalanches extend offshore. Debris avalanches that reach the inlet have the potential to generate tsunami. A tsunami was generated during the 1883 eruption that had a height of 30 feet (9 m) at Port Graham. Historic eruptions were recorded in 1812, 1883, 1935, 1963-64, 1976, and 1986. Augustine's eruptions tend to be highly explosive and tend to spread ash across the Cook Inlet region. The eruption commonly end with the less explosive extrusion of a lava dome.

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 volcano's summit. The latest episode of edifice collapse occurred during Augustine's largest historical eruption in 1883; subsequent dome growth has restored the volcano 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 1800-2000 years, and five major pumiceous tephras have been erupted during this interval. Historical 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.

Answer 2

Augustine Volcano

Answer 3

1. the most active volcano of the eastern Aleutian arc. The oldest dated volcanic rocks on Augustine are more than 40,000 years old. Its an uninhabited island.

2. generates Tsunami:
During an eruption in 1883, a large flank collapse (also known as debris avalanche) occurred on the north side of the volcano. This collapse triggered a tsunami which was observed at Nanwalek as a surge estimated at 6 meters above normal sea level. The wave was also recorded by a Kodiak tide gage with a 20 cm peak-to-trough amplitude. According to USGS studies, these flank collapses occur approximately every 150-200 years.
http://wcatwc.arh.noaa.gov/Augustine/AugustineWeb.htm
Eyewitness accounts of the eruption and tsunami:
http://wcatwc.arh.noaa.gov/web_tsus/18831006/narrative1.htm
http://wcatwc.arh.noaa.gov/web_tsus/18831006/narrative2.htm

4. Maybe you find people more interesting than geology: Saint Augustine was named by the world-reknowned explorer Capt. James Cook. Named on Saint Augustine's Day. On this trip, the British explorer was looking for a Northwest Passage--a passage across northern North America from the Atlantic to the Pacific. More on this voyage-http://explorenorth.com/library/yafeatures/bl-Cook1.htm

4. when it erupts, it threatens all the airline traffic flying the northern route. Why? because gritty air-borne ash can shut down jet engines. Jan 2006 headline: Alaska Airlines Cancels 28 Flights As Result Of Mt. Augustine Volcano Eruption
http://www.alaskasworld.com/Newsroom/ASNews/ASstories/AS_20060113_155042.asp

Answer 4

I was wondering the same thing myself yesterday