Chpt11_pptteacher - Earthquakes Chapter 11 Whatisanearthquake An earthquake is the vibration of Earth produced by the rapid release of energy Energy

Chpt11_pptteacher - Earthquakes Chapter 11...

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Earthquakes Chapter 11
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   What is an earthquake?
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New Zealand Earthquake
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Earthquake focus  and epicenter Figure 11.2
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   What is the cause of earthquakes? )
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What is an earthquake?
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Figure 11.3 (left)
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Figure 11.4
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Earthquake Rupture and propagation Most of the time faults are locked in position, and no movement is occurring, due to confining pressure. But strain is building up. Eventually the fault ruptures at the focus, overcoming the frictional forces holding the sides together. The slippage propagates away from the focus Slippage stops when the rupture reaches a fault section with less built up strain.
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Figure 11.5
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Figure 11.6
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Seismology The study of earthquake waves, seismology , dates back almost 2000 years to the Chinese Seismographs , instruments that record seismic waves Records the movement of Earth in relation to a stationary mass on a rotating drum or magnetic tape When the vibration from an earthquake reaches the instrument inertia keeps mass stationary, the Earth and support move.
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