plate tectonics (pp 339-343) plate boundaries (pp 343-348) earthquakes (pp 375-384) wednesday july...
TRANSCRIPT
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• Plate tectonics (pp 339-343)• Plate boundaries (pp 343-348)• Earthquakes (pp 375-384)
Wednesday July 11
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QuickTime™ and aTIFF (Uncompressed) decompressor
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QuickTime™ and aTIFF (Uncompressed) decompressor
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Free floating magnetite particles align following a well defined pattern around a magnet.If support is frozen, and magnet is moved, magnetite particles keep trace of the old position of the magnet
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Magnetic poles drift?
Yes, but not possible to have two north poles!!!
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Plate tectonics is the explanation!!
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Evidences of plate tectonics
1) Shape of continents
2) Magnetic pole drift
3) Hot spots
4) Magnetic striping and age of seabed
5) Similarities in fauna and flora
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Evidences of plate tectonics
1) Shape of continents
2) Magnetic pole drift
3) Hot spots
4) Magnetic striping and age of seabed
5) Similarities in fauna and flora
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Evidences of plate tectonics
1) Shape of continents
2) Magnetic pole drift
3) Hot spots
4) Magnetic striping and age of seabed
5) Similarities in fauna and flora
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Plate motion and
boundaries
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Why do plates move??
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PLATE MOTIONThree types of plate boundary
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Divergent boundary
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Animation 1
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Example: Mid-Atlantic
Ridge
•a topographically high area near the middle of the Atlantic Ocean
•splits nearly the entire Atlantic Ocean north to south,
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Divergent: Atlantic Ridge
LAVA FOUNTAINSKRAFLA VOLCANOICELAND
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Rio Grande Rift
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Animation 2
Convergent boundary I:oceanic -continental plate involved ->
Subduction
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OCEANIC-CONTINENTAL COLLISONS SUSTAIN MOSTVOLCANIC ACTIVITY AROUND THE PACIFIC OCEAN
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Convergent boundary II:oceanic -oceanic plates involved ->
SubductionSubduction processes in oceanic-oceanic
plate convergence result in the
formation of volcanic arc islands
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Animation 3
Convergent boundary III:NO oceanic plate(s) involved -> Mountain
chains
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Convergent boundary III:NO oceanic plate(s) involved -> Mountain
chains
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Example: Andes Mtns
West margin of the South American continent
•oceanic Nazca Plate is pushed toward and beneath the continental portion of the South American Plate
•typical example of a convergent plate boundary
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Nazca - S.America plate collision
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Transform boundary
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Animation 4
Transform boundary
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Example:San Andreas fault in California
Pacific Plate slides past the North American Plate.
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Transform boundary
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Plate Motion Summary
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Earthquakes
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• Are due to the release of strain in the lithosphere
• They propagate as waves of two types:
• Compression (or longitudinal or P-mode) waves
• Deformation (or transversal or S-mode) waves
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