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Ice and Fire: The Tale of Frosty, Alaska’s Dormant Stratovolcano

Satellite image of Frosty Peak Volcano captured on April 22, 2023, by the Operational Land Imager-2 on Landsat 9.

The Alaskan stratovolcano has not come to life in thousands of years.

Frosty is a stratovolcano located in Alaska’s Aleutian Island chain. Although the volcano has been dormant for thousands of years, the rock below its glaciated peak tells a story of its lively past.

The image above, acquired by Landsat 9’s OLI-2 (Operational Land Imager-2) on April 22, 2023, shows Frosty’s 5,670-foot (1,728-meter) peak and the nearby town of Cold Bay to the north.

Geologic surveys of the volcano indicate that Frosty’s summit caldera is made up of two coalescing craters. Volcanic activity likely began from a single central vent, and fissures on its flanks contributed to its growth. But during the later stages of its development, activity shifted to a new principal vent, creating its present-day two-crater summit.

Frosty Volcano 2023 Peak

Close up detailed view of Frosty Volcano from the image above.

According to the U.S. Geological Survey, explosive activity occurred at intervals throughout the growth of Frosty’s main cone. But much of its eruptive activity was effusive, in which basaltic lava flowed from the vent.

To the south of Frosty is Morzhovoi, an extensively eroded stratovolcano with long u-shaped valleys extending from a central caldera. Only remnants of the volcano remain, with isolated peaks that are fragments of the original caldera rim.

Both volcanoes have been relatively quiet for thousands of years. In July and August 2001, the Alaskan Volcano Observatory received several reports of steam emanating from Frosty’s peak. After some investigation, the observatory determined that the volcano was still inactive. Mount Shishaldin, a livelier volcano on Unimak Island southwest of the Cold Bay Complex, has had at least 13 explosive events since July 2023.

NASAEstablished in 1958, the National Aeronautics and Space Administration (NASA) is an independent agency of the United States Federal Government that succeeded the National Advisory Committee for Aeronautics (NACA). It is responsible for the civilian space program, as well as aeronautics and aerospace research. Its vision is "To discover and expand knowledge for the benefit of humanity." Its core values are "safety, integrity, teamwork, excellence, and inclusion." NASA conducts research, develops technology and launches missions to explore and study Earth, the solar system, and the universe beyond. It also works to advance the state of knowledge in a wide range of scientific fields, including Earth and space science, planetary science, astrophysics, and heliophysics, and it collaborates with private companies and international partners to achieve its goals.” data-gt-translate-attributes=”[{“attribute”:”data-cmtooltip”, “format”:”html”}]” tabindex=”0″ role=”link”>NASA Earth Observatory images by Lauren Dauphin, using Landsat data from the U.S. Geological Survey.

Source: SciTechDaily