This 8 minute video uses the analogy of a lightbulb to explain the how an earthquake can have different intensities at different places. Magnitudes are based on a logarithmic scale (base 10). What ...
II Felt by a few people, especially on upper floors. III Noticeable indoors, especially on upper floors, but may not be recognized as an earthquake. IV Felt by many indoors, few outdoors. May feel ...
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