Plate Boundaries and Hazards

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5 Terms

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Divergent Plate Boundaries

plates move apart

  • associated with earthquakes and volcanic eruptions (basaltic, not explosive)

  • decompression melting

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Transform Fault Boundaries

plates slide past each other horizontally (ex: san andres fault)

  • great earthquake hazard

  • strike-slip faults

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Convergent Plate Boundaries

plates collide (subduction zones and continent-continent)

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Subduction Zones

denser oceanic plate goes underneath an oceanic or continental plate (less dense)

  • associated with explosive volcanoes (andesitic or rhyolitic); severe landslides, earthquakes, mudflows, ash flows too (more than 80% subaerial eruptions)

  • water from subducting plate causes mantle melting

  • composite cones and stratovolcanoes

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Continent-continent

collision zone

  • crust too low in density to subduct

  • associated with earthquakes and high topography (mountains), affecting climate