The Richter Scale is a measure of ground motion.

里氏震级是测量地动的单位。

《牛津词典》

Analysis of the attenuation law of ground motion energy.

地震动能量衰减规律的统计分析。

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Structures have little magnification effect for vertical ground motion.

结构对地面竖向运动没有放大作用。

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

BBC: Christchurch quake mapped from space

Of course, companies like Research in Motion have broken ground by providing their customers with easy-to-use e-mail systems over handheld PDAs, such as the BlackBerry.

FORBES: Magazine Article

The Finnish handset maker reported a 1.4% drop in net income after losing ground to rivals Research in Motion (RIMM) and Apple in the lucrative smartphone market.

FORBES: Apple Buoyed Asian Tech Sector