30 Cool Facts about Mount St. Helens - USGS Publications …
2010年4月30日 · 1—During the past 4,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range. 2— Most of Mount St. Helens is younger than …
Mount Saint Helens | Location, Eruption, Map, & Facts | Britannica
2024年11月17日 · 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 - Wikipedia
Mount St. Helens is 34 miles (55 km) west of Mount Adams, in the western part of the Cascade Range. Considered "brother and sister" mountains, the two volcanoes are approximately 50 …
Mount St. Helens - HISTORY
2018年3月9日 · Mount St. Helens is a volcano located in southwestern Washington state. It’s the most active volcano in the Cascade Range, a mountain range that extends from British …
Mount St. Helens National Volcanic Monument - US Forest Service
A vast, gray landscape lay where once the forested slopes of Mount St. Helens grew. In 1982 the President and Congress created the 110,000-acre National Volcanic Monument for research, …
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 …
Geologic History Summary for Mount St. Helens
2023年11月9日 · Over its rich and complex 275,000-year history, Mount St. Helens has produced both violent explosive eruptions of volcanic tephra and relatively quiet outpourings of lava.
Mount St. Helens Fact Sheet | Volcano World | Oregon State …
Fifty miles from Portland, Oregon, in the Gifford Pinchot National Forest in the State of Washington. Height: Summit elevation now approximately 8,300 feet. Original height before …
Mount St. Helens - Facts and Figures - National Oceanic and …
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 | Volcano World | Oregon State University
Mount St. Helens Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit …