GEOL 108 - Crises of a Planet Lab 4 - Volcanic Hazards and Igneous Rocks
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GEOL 108 - Crises of a PlanetLab 4 - Volcanic Hazards and Igneous Rocks
Sept. 23 - 28, 2012
Department of Earth Sciences
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Department of Earth Sciences
REVIEW | 2
QUIZ 2 REVIEW
Part 1: The January 2010 Haiti earthquake was one of the most destructive in recent history. It measured 7.0 in magnitude. Use the seismogram and travel-time graph to fill in the following chart.
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Department of Earth Sciences
REVIEW | 3
QUIZ 1 REVIEW• Part 3: What geologic condition in Oregon and Washington indicates the possibility
of a Sumatra-like tsunami hitting this coast? How is this related to the mountains and volcanoes onshore called the Cascade Range? (2 points)
http://www.tulane.edu/~sanelson/geol204/eqhazards&risks.htm
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Department of Earth Sciences
VOLCANIC HAZARDS | 4
LAB 4 - VOLCANIC HAZARDS AND IGNEOUS ROCKS
• Assess volcanic hazards in different settings
• Read topographic maps
• Recognize some igneous rocks and where they form
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Department of Earth Sciences
VOLCANIC HAZARDS | 5
TOPOGRAPHIC MAPS
Sandstone in Canyonlands, Utah
Scale: 1:250 000Contour interval 200 ft
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Department of Earth Sciences
VOLCANIC HAZARDS | 6
TOPOGRAPHIC MAPS
Scale: 1:24 000Contour interval 10 ft
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Department of Earth Sciences
VOLCANIC HAZARDS | 7
TOPOGRAPHIC MAPS
• Topographic contour lines are lines of constant elevation• Hachured lines indicate depressions• Pay attention to contour interval• Relief = elevation difference
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Department of Earth Sciences
VOLCANIC HAZARDS | 8
VOLCANIC HAZARDS
Lahars, lava flows, pyroclastic flows, earthquakes, tephra/ash, landslides
http://pubs.usgs.gov/fs/1997/fs114-97/resources/BuriedHouse.jpg
Lahar after Pinatubo eruption
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Department of Earth Sciences
VOLCANIC HAZARDS | 9
VOLCANIC HAZARDS
www.boston.com http://www.marketoracle.co.uk/Article18692.html2010 Iceland eruption
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Department of Earth Sciences
VOLCANIC HAZARDS | 10
VOLCANIC HAZARDS
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Department of Earth Sciences
VOLCANIC HAZARDS | 11
VOLCANO TYPES AND ROCKS
• Stratovolcano, shield volcano, plug dome, cinder cone
http://en.wikipedia.org/wiki/File:Volc%C3%A1n_Chait%C3%A9n-Sam_Beebe-Ecotrust.jpg
Plug dome