How Are Lassen Peak and Mount Shasta Related to Subduction

Shasta and its smaller sister peak to the southeast Mt. Mount Shasta is one of the twenty or so large volcanic peaks that dominate the High Cascade Range of the Pacific Northwest.

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Geological Survey though the peaks are only ranked a Level 2 out of four threat-monitoring levels according to north state emergency management officials.

. Lassen Peak and Mount Shasta are both volcanoes that are part of the Cascade mountain range which runs across Northern California Oregon and Washington. Lassen Peak in Lassen Volcanic National Park is an amalgamation of rhyolite lava domes. Shasta prominent landmark at an elevation of 4 317 meters 14 162 feet volume of nearly 500 cubic kilometers makes it the largest of the Cascade stratovolcanoes.

In the case of Lassen Peak it is the North American plate and the Pacific. The volcanic chain from southern Canada to Northern California is part of the North Pacific Subduction Zone - the Juan de Fuca plate and Gorda Plate are being pushed under the North American plate. A series of explosions and ash clouds from the peak between 1914 and 1921 represents the last large volcanic eruption within the lower 48 states prior to Washingtons Mt.

Like many other volcanoes Lassen Peak formed along a convergent plate boundary between an oceanic and a continental plate. The most voluminous of the Cascade volcanoes northern Californias Mount Shasta is a massive compound stratovolcano composed of at least four main edifices constructed over a period of at least 590000 years. The two most recent were Lassen Peak from 1914 to 1921 and a major eruption of Mount St.

Located in the Shasta Cascade region of Northern California it is part of the Cascade Volcanic Arc which stretches from southwestern British Columbia to northern California. Lassen are considered very high threat volcanoes by the US. An ancestral edifice was destroyed by one of Earths largest known Quaternary subaerial debris avalanches which filled the Shasta River valley NW of the volcano.

Shasta likely last erupted in 1786. Two most recent were Lassen Peak in 1914 to 1921 and a major eruption of Mount St. These isolated peaks and the hundreds of smaller vents that are scattered between them lie about 200 kilometers east of the coast and trend southward from Mount Garibaldi in British Columbia to Lassen Peak in.

The Cascade Volcanoes Caused by subduction Explorer Juan de Fuca and Gorda oceanic plates North American continental plate. Lassen Peak reaches an elevation of 10457 ft standing above. Lassen Peak commonly referred to as Mount Lassen is the southernmost active volcano in the Cascade Range of the Western United States.

The dominant feature of the park is Lassen Peak the largest plug dome volcano in the world and the southernmost volcano in the Cascade Range.

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Volcanoes And Their Relation To Plate Tectonics

Volcanoes And Their Relation To Plate Tectonics