seismic disturbance is a noun meaning "an instance of agitation of the earth's crust". It carries one recorded sense.
an instance of agitation of the earth's crust
“the first shock of the earthquake came shortly after noon while workers were at lunch”
Definitions, synonyms and semantic relations for seismic disturbance come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.