seismic /ˈsaɪzmɪk/ adjective Learner's definition of SEISMIC
always used before a noun
1
technical : of, relating to, or caused by an earthquake地震的;地震引起的 2
[more seismic; most seismic] : very great or important重大的;重要的 — seismically
/ˈsaɪzmɪkli/ adverb