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USGS CMG InfoBank: Earthquakes Are Shockwaves

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Comment: 04:36 - 05:06 (00:30)
Source: Annenberg/CPB Resources - Earth Revealed - 9. Earthquakes
Keywords: earthquake, crust, stress, "fault zone", fault, "James Sadd"

Our transcription: Earthquakes are shock-waves.
They are produced when rocks break and vibrate when two blocks of the Earth's crust slide past one another.
This usually occurs along a fault, which is a zone of weakness in the Earth's crust.
Movement of the Earth's crust causes stress to accumulate in the rocks of the fault zone.
I can feel the stress accumulating in my hands as I try to slide them past one another.
The rocks will eventually break when the accumulated stress exceeds the strength of the rocks in the fault.

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