He was shaking violently.

他在拼命挥舞（胳膊）。

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Relatives found him the next day pacing near a pond, covered with scratches, shaking violently, she said.

第二天，亲戚们在附近的一个水塘里找到了他。他在里面踱步，满身伤痕，浑身颤抖。

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Once my friend managed to get his mom's washing machine to spin around with me standing in it! That was fun until the washer started shaking violently.

他说，有一次，我朋友让我站在他家的洗衣机里，然后居然开动了洗衣机，好玩极了，谁知后来洗衣机开始剧烈摇晃。

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"That's when the house started shaking violently, like it was grabbed by both sides, " said Grounds, a judge for Madison County's juvenile court.

NPR: Severe Storms Sock Midwest, Push East; 2 Dead

At the Taipei office of The Wall Street Journal, the quake was felt for at least 15 seconds, shaking the ceiling violently enough that it squeaked.

WSJ: Earthquake Hits Central Taiwan