Discussion
High-frequency content in a ground motion attenuates with distance
Answer: D
Correct answer: faster than low-frequency content
Short wavelengths are scattered and absorbed far more effectively by the heterogeneity of the crust, so the high frequencies are stripped out of the wave train as it travels. A record close to the source is rich in high frequencies and sharp in appearance; one at a few hundred kilometres is dominated by long-period motion, which is why distant great earthquakes threaten tall buildings rather than low ones.
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