Origin: 1895–1900, Americanism; < Sp: lit., a quaking, equiv. to tembl(ar) to quake (perh. ≪ L timēre to fear and LL tremulāre to quake; see tremble) + -or-or1
earth·quake (ûrth'kwāk') n. A sudden movement of the earth's crust caused by the release of stress accumulated along geologic faults or by volcanic activity. Also called seism, temblor.
earthquake, 1876, from Amer.Sp. temblor "earthquake," from Sp. temblor, lit. "a trembling," from temblar "to tremble," from V.L. *tremulare (see tremble).