Search Result for "mercalli scale":
Wordnet 3.0

NOUN (1)

1. a scale formerly used to describe the magnitude of an earthquake; an earthquake detected only by seismographs is a I and an earthquake that destroys all buildings is a XII; 



WordNet (r) 3.0 (2006):

Mercalli scale
    n 1: a scale formerly used to describe the magnitude of an
         earthquake; an earthquake detected only by seismographs is
         a I and an earthquake that destroys all buildings is a XII