题目内容
L waves are confined to the Earth's surface and outer layers because, like waves on the ocean, they need a free surface to ripple in order to exist.
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The vibration direction of S waves is perpendicular to travelling.
P waves are the first waves to arrive, and it can only travel through solid.
The distance from the epicenter to a place where the earthquake is recorded through a seimograph is called:
The depth between focus and epicenter is called :
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