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Earthquakes 101How Are Earthquakes Measured?On Shaky Ground: Building a Safer Future in HaitiScience Bulletins: Tsunami Science—Reducing the RiskFrom Math to MapsScientists at Work: San Andreas FaultExploration Questions: EarthquakesAnswers to Exploration Questions: Earthquakes
Over millions of years, ocean basins open and close, continents move and change shape, and mountains are pushed up and eroded away. Such dynamic processes continually reshape the surface of the Earth. The movement of rigid plates on the Earth’s surface, known as plate tectonics, is the cause of these changes. Volcanic eruptions and earthquakes are dramatic hints of the great movements that take place over the vastness of geological time.