mega-quake - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    a very powerful earthquake, which measures more than 7 on the Richter scale

    Mega-quakes of magnitude 9 or greater occur less frequently in the northern segment and can rupture the entire fault, even as magnitude-8 earthquakes strike more often in the southern segment.

    Submitted from United Kingdom on 16/03/2011