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  2. 1980 eruption of Mount St. Helens - Wikipedia

    en.wikipedia.org/wiki/1980_eruption_of_Mount_St...

    On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am. The eruption, which had a volcanic explosivity index of 5 ...

  3. Phreatic eruption - Wikipedia

    en.wikipedia.org/wiki/Phreatic_eruption

    Phreatic eruption at the summit of Mount St. Helens, Washington, in the spring of 1980. A phreatic eruption, also called a phreatic explosion, ultravulcanian eruption or steam-blast eruption, [1] occurs when magma heats ground water or surface water. The extreme temperature of the magma (anywhere from 500 to 1,170 °C (930 to 2,100 °F)) causes ...

  4. Mount Mazama - Wikipedia

    en.wikipedia.org/wiki/Mount_Mazama

    Mount Mazama (Tum-sum-ne in the Native American language Klamath [5]) is a complex volcano in the western U.S. state of Oregon, in a segment of the Cascade Volcanic Arc and Cascade Range. The volcano is in Klamath County, in the southern Cascades, 60 miles (97 km) north of the Oregon– California border and. Its collapse, due to the eruption ...

  5. Mount St. Helens - Wikipedia

    en.wikipedia.org/wiki/Mount_St._Helens

    Mount St. Helens. Mount St. Helens (known as Lawetlat'la to the indigenous Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington, [1] in the Pacific Northwest region of the United States. It lies 52 miles (83 km) northeast of Portland, Oregon, [2] and 98 miles (158 km ...

  6. 2004–2008 volcanic activity of Mount St. Helens - Wikipedia

    en.wikipedia.org/wiki/2004–2008_volcanic...

    The 2004–2008 volcanic activity of Mount St. Helens in Washington, United States has been documented as a continuous eruption in the form of gradual extrusion of magma. Starting in October 2004 and ceasing in January 2008, a new lava dome was built up. The new dome did not rise above the rim of the crater created by the 1980 eruption of Mount ...

  7. Campanian Ignimbrite eruption - Wikipedia

    en.wikipedia.org/wiki/Campanian_Ignimbrite_eruption

    The Campanian Ignimbrite eruption (CI, also CI eruption) was a major volcanic eruption in the Mediterranean during the late Quaternary, classified 7 on the Volcanic Explosivity Index (VEI). [1][2] The event has been attributed to the Archiflegreo volcano, the 12-by-15-kilometre-wide (7.5 mi × 9.3 mi) caldera of the Phlegraean Fields, located ...

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