seismic disturbance, shock - an instance of agitation of the earth's crust; "the first shock of the earthquake came shortly after noon while workers were at lunch"

earth tremor, microseism, tremor - a small earthquake

seaquake, submarine earthquake - an earthquake at the sea bed

geological phenomenon - a natural phenomenon involving the structure or composition of the earth

commotion, hoo-ha, hoo-hah, hurly burly, kerfuffle, stir, to-do, disruption, disturbance, flutter - a disorderly outburst or tumult; "they were amazed by the furious disturbance they had caused"