Lassen Peak

Lassen Peak, also known as Mount Lassen, is the southernmost active volcano in the Cascade Range. It is part of the Cascade Volcanic Arc which is an arc that stretches from southwestern British Columbia to northern California. Located in the Shasta Cascade region of Northern California, Lassen rises 2,000 ft (600 m) above the surrounding terrain and has a volume of 0.5 cu mi (2 km3), making it one of the largest lava domes on Earth. It was created on the destroyed northeastern flank of now gone Mount Tehama, a stratovolcano that was at least 1,000 ft (300 m) higher than Lassen Peak.

On May 22, 1915, a powerful explosive eruption at Lassen Peak devastated nearby areas, and volcanic ash rained down as far as 200 mi (300 km) to the east. This explosion was the most powerful in a series of eruptions from 1914 through 1917. Lassen Peak and Mount St. Helens – which had a massive eruption in 1980 – are the only two volcanoes in the continental United States to erupt during the 20th century. Lassen Volcanic National Park was created in Shasta County, Calif., to preserve the devastated areas as they were, for future observation and study, and to preserve the nearby volcanic features.

Unlike most lava domes, Lassen Peak is topped by craters. A set of these craters exists around the summit of Lassen Peak, although two of them have been covered up by solidified lava and sulfur deposits. Lassen Peak is the largest of a group of more than 30 volcanoes that have erupted over the past 300,000 years in the Lassen Peak volcanic area.

Read more about Lassen Peak:  Climate, Geology, Human History

Other articles related to "lassen peak, peak, lassen, peaks":

Cascade Volcanoes - Eruptions of The Cascades - Major Catastrophic Eruptions
1914–17 Eruptions of Lassen Peak On May 22, 1915, an explosive eruption at Lassen Peak devastated nearby areas and rained volcanic ash as far away as 200 ... This explosion was the most powerful in a 1914–17 series of eruptions at Lassen Peak ... from a vent on the north-east side of Plinth Peak ...
Lassen Volcanic National Park - Geology - Volcanoes Rise
... One of these eruptions occurred where Lassen Peak now stands, and consisted of fluid, black, glassy dacite, which formed a layer 1,500 feet (460 m) thick (outcroppings of ... Roughly 27,000 years ago (older data gave an age of 18,000 years), Lassen Peak started to form as a dacite lava dome quickly pushed its way through Tehama's destroyed north-eastern flank ... Lassen rose and reached its present height in a relatively short time, probably in as little as a few years ...
Cascadia Subduction Zone - Cascade Volcanic Arc
... the coast, and forms a north-to-south chain of peaks that average over 3,000 m (10,000 ft) in elevation ... The major peaks from south to north include Lassen Peak and Mt ... Rainier, Glacier Peak, Mt ...
Lassen Peak - Early 20th Century Eruptions - Later Volcanic Activity
... snowmelt water percolating down into Mount Lassen triggered steam explosions, an indication that magma beneath the surface of the volcano remained quite hot ... the United States Park Service, has been monitoring Lassen Peak and other volcanic and geothermal areas in the park ...
Mount Tehama
... Part of the Lassen volcanic center, its highest remaining remnant, Brokeoff Mountain, is itself the second highest peak in Lassen Volcanic National Park and connects to the park's highest point, Lassen Peak ... the border of Tehama County and Shasta County, Tehama's peak is the highest point in the former ... The hikers that summit this mountain each year are treated to "exceptional" views of Lassen Peak, the Central Valley of California, and many of the park's other ...

Famous quotes containing the word peak:

    In all things I would have the island of a man inviolate. Let us sit apart as the gods, talking from peak to peak all round Olympus. No degree of affection need invade this religion.
    Ralph Waldo Emerson (1803–1882)