题目内容
The vibration direction of S waves is perpendicular to travelling.
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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 :
The point at which the vibration initiates and thus the energy is released in the crust or mantle is called:
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