Search results
Results from the WOW.Com Content Network
[13]: 215 An eruption in 1900 BC was the largest known eruption from St. Helens during the Holocene epoch, depositing the Yn tephra. [ 13 ] : 215 [ 31 ] This eruptive period lasted until about 1600 BC and left 18 inches (46 cm) deep deposits of material 50 miles (80 km) distant in what is now Mount Rainier National Park .
The Eruption of Mount St. Helens! – documentary movie about the eruption; St. Helens - television movie about the eruption; Geology of the Pacific Northwest; Helenite – An artificial glass marketed as a gemstone, made by fusing the volcanic dust from Mount St. Helens's May 1980 eruption; List of Cascade volcanoes
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [ 1 ] [ 2 ] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980 .
Seismologists hadn't monitored earthquake activity in the Mount St. Helens area until seismometers were installed near the volcano in 1972, and from January 1975 through early 1980, only 44 ...
View the Mount St. Helens Fast Facts on CNN and learn more about the volcano in Washington.
Located in southern Washington state, Mount St. Helens is notorious for its eruption on May 18, 1980. ... 2024, but these levels fall well within the volcano’s normal range of seismic activity.
During the May 18, 1980 eruption of Mount St. Helens, Spirit Lake received the full impact of the lateral blast from the volcano. The blast and the debris avalanche associated with this eruption temporarily displaced much of the lake from its bed and forced lake waters as a wave as much as 850 ft (260 m) above lake level on the mountain slopes ...
The Yn tephra is a geologically recent tephra deposit that covers portions of the U.S. state of Washington and the Canadian provinces of British Columbia and Alberta.It was created by the largest known volcanic eruption from Mount St. Helens, having taken place in possibly 1860 BCE as part of the Smith Creek eruptive period.