A seismograph is an instrument which gives a continuous record of the motion of the ground.

地震仪是提供地面运动的连续记录。

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The Richter Scale is a measure of ground motion.

里氏震级是测量地动的单位。

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These factors include importance of the dam, severity of the ground motion, occurrence or lack of observed damage, and availability of quality strong motion records at or near the dam.

这些因素包括：大坝的重要性，地震时地面运动的程度，大坝出现或没有出现重大损坏，以及在当地或附近发生强震时大坝质量的可靠性。

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In this interferogram, the peak ground motion is almost 50cm of motion towards the satellite.

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Whether you are standing still or in motion, your feet are your first point of contact with the ground.

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