Discussion
An increase of one unit of magnitude corresponds to a wave amplitude greater by a factor of about
Answer: A
Correct answer: 10
The magnitude scale is the base ten logarithm of amplitude, so one unit is a tenfold increase in the amplitude recorded on the seismogram. The factor of about 32 belongs to energy rather than amplitude, and the two are constantly confused - the energy grows faster because it depends on the square of the amplitude and on the duration of the rupture.
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