'Large quake' presentation slideshows

What is happening in this photograph??

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The ground is constantly moving in Southern California. Almost every day there are small shifts of the rock beneath the surface that would go unnoticed except for the dutiful recordings of seismic equipment throughout the region. When the rocks bump against each other, they can crack, break and slip, which causes a release of energy. The motion (slipping) continues until the rock gets stuck.

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