photo credit: USGS; photo by D. Cavit; image source
Imperial Valley Earthquake
The photo (hi-res version) shows sideways movement in a plowed field in Imperial Valley, California, following the magnitude 6.5 earthquake there in 1979. You can see other photos such as offset of a woodpile and canal offset (and check out the animation). To learn more, visit San Andreas Fault.
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Visit the Exploratorium's Faultline to learn about the great 1906 San Francisco earthquake and how our understanding of seismology has progressed since then. Don't miss the activities in "Active Zone," especially "Cookie Subduction" and "Liquifaction."