Lecture 7 - Mountain Building

Lecture 7 - Mountain Building - Lecture 7 Volcanoes,...

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Unformatted text preview: Lecture 7 Volcanoes, Mountain Building Video: Hawaiian Lava Flows A student note taker is needed in this course to take notes for a student with a disability. The note taker will be paid a stipend for this assignment. Skills needed are the ability to take accurate, legible, and organized notes and a commitment to attend every lecture. If interested, please contact Karishma Patel or Tina Allen via email at notetaker@vpss.gatech.edu as soon as possible. Be sure to indicate the Professor's name, time, day and course number in the subject line of the announcement. Types of Volcanoes Size Comparison of the Three Volcano Types Shield Volcanoes Shield volcano Broad, slightly domed Primarily made of basaltic (fluid) lava Generally large size e.g., Mauna Loa in Hawaii Shield Volcanoes Video Hawaii: The Hot Spot Volcanoes Cinder Cones Cinder cone Built from ejected lava fragments Steep slope angle Rather small size Frequently occur in groups Cinder Cones Stratovolcanoes (Composite Cone) Stratovolcano Most are adjacent to the Pacific Ocean (e.g., Mt. Rainier) Large size Interbedded lavas and pyroclastics Most violent type of activity Stratovolcano Stratovolcanoes Stratovolcano Often produce nue ardente Fiery pyroclastic flow made of hot gases infused with ash Flows down sides of a volcano at speeds up to 200 km (125 miles) per hour May produce a lahar - volcanic mudflow Nue Ardente on Mt. St. Helens Lahar Along the Flanks of Mt. St. Helens Other Volcanic Landforms Calderas Steep walled depression at the summit Formed by collapse Nearly circular Size exceeds one kilometer in diameter Fissure eruptions and lava plateaus Fluid basaltic lava extruded from crustal fractures called fissures e.g., Columbia Plateau Caldera Formation 2) 3) 4) 1) Caldera Formation: Crater Lake Crater Lake, Oregon Crater Lake Video Long Valley Caldera Fissure Eruptions Columbia River Basalts...
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This note was uploaded on 01/26/2012 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Institute of Technology.

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Lecture 7 - Mountain Building - Lecture 7 Volcanoes,...

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