connected with or caused by earthquakes 地震的；地震引起的 seismic waves 地震波
having a very great effect; of very great size 影响深远的；重大的 a seismic shift in the political process 政治进程中的剧变
Word Originmid 19th cent.: from Greek seismos ‘earthquake’ (from seien ‘to shake’) + -ic.