Discussion Unit 4- ESC1000
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Broward College *
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Course
1000
Subject
Geography
Date
Dec 6, 2023
Type
docx
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Uploaded by CaptainFogWallaby36
Volcano name and location:
Shishaldin, United States
Volcano type:
Stratovolcano
Last eruption/ Volcano Status:
November 7
th
, Active
The symmetrical glacier-covered Shishaldin is the highest and one of the most active
volcanoes of the Aleutian Islands. It is the westernmost of three large stratovolcanoes in the
eastern half of Unimak Island (Global Volcanism Program, 2023). There are major rocks
consisting in the volcano such as basalt and andesite. Its tectonic setting is in the subduction zone
and continental crust over 25 kilometers. In frequent explosive activities, it consists of
Strombolian ash eruptions, but can sometimes produce lave flows as well, which was recorded
back in the 18
th
century. Also, steam rises often from the crater.
It is flanked to the northwest by
24 monogenetic parasitic cones. The Shishaldin cone is less than 10,000 years old and is
constructed on a glacially eroded remnant of an ancestral soma and shield (Alaska Volcano
Observatory, 2023). Shishaldin had overall 24 confirmed eruptions, which were relatively small.
However, its strongest volcano recorded was back in 1999, as the ash column reached 8.5 miles
above sea level. Since then it was quiet until recently in July 2023.
After three years of quiet, the Shishaldin volcano in Alaska’s Aleutian Islands erupted in mid-
July 2023. Explosions from the volcano lofted ash several miles into the air, prompting aviation
alerts (Cassidy, 2023). After July, repeated cycles have erupted and the volcano at the moment is
very active as its last eruption was this November 2023.
Image credit:
Matt Loewen, USGS/AVO
References
Alaska Volcano Observatory. (2023).
Shishaldin Volcano Description and information
.
Shishaldin - Introduction. (n.d.).
https://www.avo.alaska.edu/volcanoes/volcinfo.php?
volcname=shishaldin
Cassidy, E. (2023, July 17).
Shishaldin erupts
. NASA.
https://earthobservatory.nasa.gov/images/151619/shishaldin-erupts
Global Volcanism Program. (2023).
Global volcanism program: Shishaldin
. Smithsonian
Institution.
https://volcano.si.edu/volcano.cfm?vn=311360#November2023
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