Mid-term 1 Review Slides 010

Mid-term 1 Review Slides 010 - Mid-term 1 Review Slides...

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Mid-term 1 Review Slides Spring 2010
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Disturbance Any discrete event that transfers mass and energy from one part of a system to another in a manner that disrupts ecosystem, community, or population structure and changes resource availability or the physical environment Disturbances and Opportunities
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A “systems” approach 1. Why: Physical and chemical processes 2. Where: E nvironmental setting 3. When: F requency, return interval Magnitude and frequency 4. Impact: Redistribution of resources Opportunities 5. Recovery: Time, Processes… opportunities 6. Record: Natural and social consequences… 7. Mitigation : Impact reduction Sustainability
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Common descriptors of disturbances 1. Spatial extent and distribution area 2. Magnitude Force vs impacts 3. Frequency or Recurrence interval Time 4. Predictability Time 5. Recovery rate Time 6. Vulnerability Impacts & recovery for given magnitude
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Distribution of rocks and surface materials Igneous rocks Molten, crystalline Intrusive and Extrusive Sedimentary rocks Metamorphic “Change”; physical & chemical
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Lateral or vertical motion along fault Energy Release = Generation of waves Sudden jolt; “truck hit house” Oscillating motion, Rolling motion
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Spreading Zones Mid-Atlantic Rift Collision , subduction PNW San Andres Fault Plate Boundaries
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Hot Spots Intraplate regions Hawaii, Yellowstone Oceanic = basalt Continental = explosive Yellowstone 1 ~ 650,000 y
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Earthquake Causes 1. Plate Tectonics 1. Deep Earth circulation 2. Mass loading 1. Elastic rebound; Glacial rebound 2. Meteor impacts 3. Landslides, avalanches 4. Large Dams; shallow, local damage 5. Underground atomic bomb 6. Deep well injections,
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Causes of Earthquakes 1. Plate Tectonics 2. Mass loading 1. Elastic rebound; Glacial rebound
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Mid-term 1 Review Slides 010 - Mid-term 1 Review Slides...

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