Earthquake and Volcanoes

What is the shaking and trembling that results from the movement of rock beneath Earth's surface?

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A force that acts on rock to change its shape or volume; this adds energy to the rock where it is stored until the rock breaks or changes its shape.

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The waves generated by an earthquake that travel through the Earth.

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Fault caused by compression forces that cause the hanging wall to slide up over the footwall.

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The first wave to arrive at the seismic station; causes particles in rocks to move back and forth in the same direction as the wave is traveling; can go through solids, liquids and gasses.

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The second wave to arrive at the seismic station; causing particles in rocks to move at right angles to the direction the wave is travelling; travels only through solids.

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The point on Earth's surface directly above the focus. Can be found by triangulation.

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The point below the ground where energy is first released.

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These are breaks in the Earth's crust; rocks move along these when they pass their elastic limit

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The rock wall that lies above the fault.

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