Microseism

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Microseism \Mi"cro*seism\, n. [Micro- + Gr. ? an earthquake, fr.
     ? to shake.]
     A feeble earth tremor not directly perceptible, but detected
     only by means of specially constructed apparatus. --
     {Mi`cro*seis"mic}, {Mi`cro*seis"mic*al}, a.
     [Webster 1913 Suppl.]



From WordNet (r) 2.0 [wn]:

  microseism
       n : a small earthquake [syn: {tremor}, {earth tremor}]