The Collaborative International Dictionary of English v.0.48:

Temblor \Tem*blor"\, n. [Sp.]
   An earthquake. [Western U. S.]
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

temblor
    n 1: shaking and vibration at the surface of the earth resulting
         from underground movement along a fault plane of from
         volcanic activity [syn: earthquake, quake, temblor,
         seism]