What is the coordinates of Mount St Helens?
46.1914° N, 122.1956° W
Where is Mount St Helens located exactly?
southwestern Washington
What is the slope of Mt St Helens?
Helens, 17 eruptions between 1980 and 1991 have built a mound-shaped pile of lava called a lava dome. The dome is 3,450 feet wide and contains about 97 million cubic yards of lava….
| Environmental Factor | North Facing Slope | South Facing Slope |
|---|---|---|
| Wind | Less evaporation, more moisture | More evaporation, drier |
What is the tectonic setting of Mt St Helens?
Geological Setting Mt St Helens is a major stratovolcano in the Cascades Range, all of which have formed as a result of the ongoing subduction of the Juan de Fuca tectonic plate beneath the western coast of North America.
Is Mt St Helens a divergent boundary?
Mt. St. Helens is a volcano in Washington, near the Oregon border, in the Cascade Range. The Cascade Volcanoes, which stretch all from British Columbia through Northern California, are stratovolcanoes that have formed inland from a convergent plate boundary, where ocean crust is subducting below the continent.
Is Mt St Helens mafic or felsic?
Systematic variations in the composition of volcanism over the past several thousand years at Mt. St. Helens imply that the magma chamber is zoned, from more felsic at the top to more mafic at the bottom.
Is Mt St Helens effusive or explosive?
The common image of red hot lava flowing down Kilauea and covering roads and houses is an effusive eruption. However, predominantly explosive volcanoes such as Mount St. Helens can show effusive behavior, such as the dome growth stages following the 1980s explosive eruptions and again in 2004 (image to left).
What is the most explosive type of volcano?
Stratovolcanoes
Is Mount Saint Helens felsic?
Helens dacites indicate that magma mixing between felsic dacite and mafic magma has controlled the petrologic diversity of the dacitic magmas. Helens, and thus it appears that the continuum of magmatic composition erupted at the volcano is controlled by mixing between felsic dacite, or possibly rhyodacite, and basalt.
Is Mt St Helens going to erupt again 2020?
According to the United States Geological Survey (USGS): “We know that Mount St Helens is the volcano in the Cascades most likely to erupt again in our lifetimes. He said: “Yes, it is extremely likely that Mt St Helens will erupt again. The average eruption recurrence interval is every 100-300 years.”
What happens if Mount St. Helens erupts?
If Mount St. Helens reawakened violently, an ash plume reaching 30,000 feet (about 9,100 meters) or more could materialize in as little as five minutes, grounding aircraft and wreaking havoc on agriculture, water and power supplies, and human health, Ewert said.
How many died Mount St. Helens?
57 people