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    Earthquakes and the Richter Scale

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    The intensity level of an earthquake is based on the Richter scale. Using logarithms, the Richter scale measures an earthquake relative to (as a ratio of) the weakest possible tremor.

    What is the formula for measuring earthquakes?
    Why is a 7.0 earthquake ten times stronger than a 6.0 earthquake?
    Pick an earthquake in your region of the world.
    Give the measurement of the earthquake.
    Explain what this measurement means.

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    Solution Preview

    The intensity level of an earthquake is based on the Richter scale. Using logarithms, the Richter scale measures an earthquake relative to (as a ratio of) the weakest possible tremor.

    Using the Library, web resources, and other course materials, research how earthquakes are measured. Include the following items in your posting:

    What is the formula for measuring earthquakes?

    The Richter scale is a logarithmic scale used to measure the energy released by an earthquake. Each increase of 1 on the scale represents a 10-fold increase in energy.

    This table describing the effects of different size earthquakes can be found in the Wikipedia entry:

    Description Richter Magnitudes Earthquake Effects Frequency of Occurrence
    Micro Less than 2.0 Microearthquakes, not felt. About 8,000 per day
    Very minor 2.0-2.9 Generally not felt, but recorded. About 1,000 per day
    Minor 3.0-3.9 Often felt, but rarely causes damage. 49,000 per year (est.)
    Light 4.0-4.9 Noticeable shaking ...

    $2.49

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