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Intensity and power as functions of distance

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The intensity of a particular earthquake wave is measured to be 3.0 E6 J/m2·s at a distance of 45 km from the source.
(a) What was the intensity when it passed a point only 3.0 km from the source?
1 J/m2·s
(b) What was the rate energy passed through an area of 15.0 m2 at 3.0 km?

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The solution explains in detai how the amplitude of a wave behaves with distance and how it effects the intensity and energy of the wave.

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