PlateTectonics

PlateTectonics - • direction of rock particle vibration...

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Subject: Environmental Geology Session: Chapter 2: Plate Tectonics at 11:54 PM Internal Structures of Earth • heavy on bottom, light on top • chemical composition model • crust, mantle, core, Moho discontinuities • physical property model • lithosphere, asthenosphere, mesosphere, outer core, inner core • knowledge primarily through study of seismology • 2 basic types of waves • surface waves - biggest, do the damage • seismic P waves • primary push/pull wave - like a sound wave
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Unformatted text preview: • direction of rock particle vibration parallel to wave propagation • fastest rates of propagation - first arrival to seismographs • body waves travels through solid & liquid • seismic S waves • secondary/shear waves • direction of particles perpendicular to wave propagation • slower than P waves • propagates through Earth's interior, but not liquids/molten layers • Earth's interior boundaries - determined by sudden change in seismic waves • different rates & paths of wave propagation • Asthenosphere - low velocity zone, major source of Earth volcanism • Outer Core - no S wave through it (partially moltenl…) Plate Tectonics...
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This note was uploaded on 11/14/2011 for the course GEOG 1002 taught by Professor Engstrom during the Fall '11 term at GWU.

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PlateTectonics - • direction of rock particle vibration...

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