Earthquake \Earth"quake`\, n. A shaking, trembling, or concussion of the earth, due to subterranean causes, often accompanied by a rumbling noise. The wave of shock sometimes traverses half a hemisphere, destroying cities and many thousand lives; -- called also earthdin, earthquave, and earthshock.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Earthquake \Earth"quake`\, a. Like, or characteristic of, an earthquake; loud; starling.

The earthquake voice of victory. --Byron.

Source: Webster's Revised Unabridged Dictionary (1913)