An earthquake sends seismic waves outward from the epicenter. The waves travel through different media in different directions. What will be true for all people who feel the earth shaking?
The seismic waves will be equally far apart for all observers.
The seismic waves will travel outward at the same speed in all directions.
The amplitude of the shaking will be the same for all observers.
The earth will rise and fall with the same frequency.
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