![]() NASA Earth Observatory image by Wanmei Liang, using Landsat data from the U.S. Previous eruptions have lasted weeks to months, with repeated cycles of activity similar to what has been seen so far in July. Seismic and eruptive activity was still ongoing as of July 23, according to the observatory, which noted that it is not clear how long the eruptive activity will last. The most recent events to produce lava flows outside the crater area, as this eruption has, were in 2019-20. Most eruptions have been relatively small, although a 1999 event generated an ash column that reached 8.5 miles (14 kilometers) above sea level. Plumes of volcanic ash can contain sharp objects that can damage jet engines.Īccording to the Alaska Volcano Observatory, Shishaldin has had 24 confirmed eruptions since 1775. An eruption on July 18 generated another large ash cloud that led the National Weather Service to issue a warning to pilots to avoid the area. Two other periods of elevated volcanic activity resulted in significant ash plumes between July 17 and July 23. Geological Survey Thursday, November 10, 2022, 12:37 PM AKST (Thursday, November 10, 2022, 21:37 UTC). Novarupta (Katmai) Volcano in Alaska erupted considerably more material in 1912, but owing to the isolation and sparse population of the region, there were no human deaths and little property damage. A series of lahars (dark streaks of volcanic mud) are also visible on the volcano’s northern and southern flanks. ALASKA VOLCANO OBSERVATORY DAILY UPDATE U.S. Helens (Washington) was the most destructive in the history of the United States. Data is reported through the last data update (9 June 2023). A stop date with ' (continuing)' indicates that the eruption was considered to be ongoing as of the date indicated. Two smaller explosions occurred on July 14 and 15, launching ash plumes about 3 miles (5 kilometers) above sea level.Īsh fallout from the eruptions can be seen on the southern flanks of Shishaldin in this image, acquired by the Operational Land Imager (OLI) on Landsat 8 on July 17. There were 73 confirmed eruptions at some point during 2020 from 68 different volcanoes 27 of those were new eruptions that started during the year. Then, in the early hours of July 14, a significant explosion sent an ash cloud 6 to 7.5 miles (9 to 12 kilometers) into the air which drifted south over the Pacific Ocean. On July 11, the Alaska Volcano Observatory observed elevated surface temperatures and seismic activity. Mount Shishaldin is a cone-shaped stratovolcano located on Unimak Island and is one of the most active volcanoes in the Aleutian arc. Explosions from the volcano lofted ash several miles into the air, prompting aviation alerts. After three years of quiet, the Shishaldin volcano in Alaska’s Aleutian Islands erupted in mid-July 2023. ![]()
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