Читать книгу The Pacific Crest Trail. Hiking the PCT from Mexico to Canada онлайн

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The Cascade Mountains start with Lassen Peak in Northern California. They continue through Oregon and Washington and into Canada with a succession of major volcanoes and associated lava flows and ashes. You will see many different types of volcano in the Pacific North-West. These developed over the past two million years and remain active today. The last major eruption was in 1980 when Mount St Helens blew its top off. About 7000 years ago, Mount Mazama, in what is now Oregon, exploded with about 40 times as much force, resulting in the formation of Crater Lake. Some of the large lava flows you will see in Oregon are only 200 years old. Volcanic activity can be seen on a smaller scale on Lassen Peak, which suffered a major eruption in 1915. The PCT also passes Terminal Geyser and Boiling Springs Lake, which are evidence of magma very close to the surface there. The next eruption could occur at any time.

Polygonal basalt lava columns, Devil’s Postpile National Monument

Four main types of volcano can be seen on the PCT.