He brought his hand down suddenly, and the ground shuddered.

The ground shuddered under the impact, throwing the four observers off their feet.

The ground shuddered under its weight, and he looked quickly about him.

The cracked ground shuddered pleasantly under the impact of his feet.

The ground shuddered once, and far ahead there came the rumble of falling rock.

The ground shuddered, as it had been doing for some time, then shook under them.

Half a second later, the ground beneath their feet shuddered.

The ground shuddered and the hole closed with a grating sound.

Suddenly the ground under them shuddered, as though a great volcano had let loose.

At that moment, the ground shuddered under us, almost as though we were in a minor earthquake.