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Slide show
  Looking back
San Franciscans mark the 100th anniversary.
Video: 1906 Earthquake
Today show
1906 San Francisco quake remembered
April 18: The estimated 7.8 magnitude San Francisco earthquake struck without the faintest whisper of a warning 100 years ago today. NBC's George Lewis reports.

Interactive: When's the next Big One?
When and where will the next Bay Area quake strike? History may provide clues.

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