10 letters · 26 points in Scrabble
noun shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
noun a disturbance that is extremely disruptive
originFrom Middle English erthequake, corresponding to earth + quake. Displaced Middle English eorð byfung (“earthquake”) from Old English eorþbeofung (literally “earth shaking”).
Etymology from Wiktionary, CC BY-SA 3.0