What is a Strato cone volcano?
Stratovolcanoes are composed of volcanic rock types that vary from basalt to rhyolite, but their composition is generally andesite. They may erupt many thousands of times over life spans of millions of years. A typical eruption begins with ash explosions and ends with extrusion of thick, viscous lava flows.
What type of volcano is a Strato?
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra.
What is the example of Strato volcano?
Stratovolcanoes form impressive volcanic peaks, such as Mount Rainier, Mount Fuji, and Mount Etna. The USGS (2011) estimates that of 1511 volcanoes known to have erupted on Earth in the past 10,000 years, 699 are stratovolcanoes. Fig. 8 shows a few classic examples of stratovolcanoes.
What happens when a Strato volcano erupts?
The stratovolcano’s eruptions of more-viscous lava are the explosive ones, ejecting volcanic rock (old lava) and fresh lava violently to produce both airborne pyroclastics, or tephra, and sweeping slides of fragments downslope.
What causes a Strato volcano to erupt?
Stratovolcanoes can erupt with great violence. Pressure builds in the magma chamber as gases, under immense heat and pressure, are dissolved in the liquid rock. When the magma reaches the conduits the pressure is released and the gases explode, according to San Diego State University.
What type of volcano is Mt Saint Helens in Washington?
stratovolcano
Mount St. Helens is a stratovolcano, a steep-sided volcano located in the Pacific Northwest region of the United States in the state of Washington.
Are stratovolcanoes the most explosive?
Because they form in a system of underground conduits, stratovolcanoes may blow out the sides of the cone as well as the summit crater. Stratovolcanoes are considered the most violent.
Could Mount St. Helens erupt again?
He said: “Yes, it is extremely likely that Mt St Helens will erupt again. The average eruption recurrence interval is every 100-300 years.” The 1980 eruption of Mt St Helens is one of the most deadly in recent US history.
Is Mt St Helens in the Ring of Fire?
Helens was known as the “Fujiyama of America.” Mount St. Helens, other active Cascade volcanoes, and those of Alaska comprise the North American segment of the circum-Pacific “Ring of Fire,” a notorious zone that produces frequent, often destructive, earthquake volcanic activity.