(L08)Volcanoes_and_Volcanism_E10

(L08)Volcanoes_and_Volcanism_E10 - 1 Volcanoes and...

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Unformatted text preview: 1 Volcanoes and Volcanism GLY 2010 – Summer 2010 – Lecture 8 Eruption of Mt. Vesuvius, Italy 2 Volcano • A vent in the surface of the Earth through which magma and associated gases and ash erupt • Also, the form or structure, usually conical, that is produced by the ejected material • Plural: volcanoes • Etymology: the Roman deity of fire, Vulcan 3 Pyroclastic Eruptions • Magma spews upward with great force through a central vent Left: Mt. St. Helens, 1980 Right: Kilauea, Hawaii 4 Fissure Eruptions • Volcanic eruptions may occur much more quietly along long cracks in the ground 5 Fissure Image • Eruptive fissure on southeast rim of Kilauea caldera, Hawaii 6 Fissure Eruption • Mauna Loa Volcano, Hawaii Lava Flow Video • Kilauea, Hawaii, July 13, 2007 7 8 Flowing Lava Video • (Upper left)Lava falls Kilauea, Hawaii • (Lower left) Fissure eruptions, Hawaii (with sound) • (Below) Lava flow damage (with so und) 9 Columbia River Flood Basalt • Imnahu River Canyon • Photo: Stephen Reidel 10 Columbia River Flood Basalt • Grande Ronde Basalt 11 Pillow Basalt 12 Pillow Flow, Hawaii • Click video to play 13 Pillow Deltas 14 Vesicles 15 Scoria 16 Lava Tube or Tunnel 17 Nahuku Lava Tube • Thurston (Nahuku) lava tube • Near summit caldera of Kilauea Volcano, Hawaii Volcanoes National Park 18 Lava Tube, Hawaii 19 Lava-Sicles • Ape Cave, Mt. St. Helens 20 Andesite Volcanoes • Nevado Ojos del Salado, Chile /Argentina frontier 21 Andesite Lava Flow and Dome Volcan Láscar (Chile) 22 Rhyolitic Lava • San Francisco Peaks stratovolcano, Arizona • Sugarloaf Mountain, the small dome-shaped hill in the foreground, is a rhyolite dome 23 Tephra • General term for fragments of volcanic rock and lava that, regardless of size, are blasted into the air by explosions or carried upward by hot gases in eruption columns or lava fountains 24...
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This note was uploaded on 07/13/2011 for the course GLY 2010 taught by Professor Warburton during the Summer '07 term at FAU.

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(L08)Volcanoes_and_Volcanism_E10 - 1 Volcanoes and...

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