The document provides information about earthquakes, including what causes them, how they are measured, different types of seismic waves, damage from earthquakes, and safety tips. Specifically, it explains that earthquakes are caused by the sudden release of energy at fault lines in the earth's crust. They can be measured using seismographs which record the amplitude and duration of seismic waves. Safety advice includes having an emergency plan and supplies like food, water, and first aid ready both during and after an earthquake.

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31. EARTHQUAKE SAFETY