Mount St. Helens - Wikipedia
Mount St. Helens (known as Lawetlat'la to the local Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington, [1] …
Mount St. Helens | U.S. Geological Survey - USGS.gov
Mount St. Helens is primarily an explosive dacite volcano with a complex magmatic system. The volcano was formed during four eruptive stages beginning about 275,000 years ago and has …
Mount Saint Helens | Location, Eruption, Map, & Facts | Britannica
Nov 26, 2025 · Mount Saint Helens, volcanic peak in the Cascade Range, southwestern Washington, U.S. Its eruption on May 18, 1980, was one of the greatest volcanic explosions …
- Mount St. Helens Volcano - Current Update
3 days ago · This is a static image of Mount St. Helens, taken from the Johnston Ridge Observatory. The Observatory and VolcanoCam are located at an elevation of approximately …
Mount St. Helens National Volcanic Monument - US Forest Service
The eruption lasted 9 hours, but Mount St. Helens and the surrounding landscape were dramatically changed within moments. A vast, gray landscape lay where once the forested …
The Eruptive History of Mount St. Helens | Volcano World
The eruptive history of Mount St. Helens is subdivided here into nine named eruptive "periods," which are clusters of eruptions distinguished by close association in time, by similarity of rock …
What scientists have learned from Mount St. Helens’ devastating ...
May 18, 2025 · It was 45 years ago today that Mount St. Helens, a volcano 50 miles north of Portland, Oregon exploded in a spectacular and devastating eruption. It triggered the biggest …
Mount St. Helens Before And After Its Devastating 1980 Eruption
Apr 28, 2024 · When Mount St. Helens erupted on May 18, 1980, the devastating explosion killed 57 people, destroyed a forest the size of Chicago, and altered Washington's landscape forever.
Mount St. Helens - Facts and Figures
Notable Statistic: The May 18, 1980 blast devastated 596 square kilometers (229 square miles) and destroyed timber valued at several million dollars. This was the deadliest and most …
Mount St. Helens - Pacific Northwest Seismic Network
Mount St. Helens is the most historically active volcano in the Cascade range, having produced four major explosive eruptions since 1479, and dozens more smaller eruptions, including …