Rossi-Forel scale
noun
¦rȯ|sēfəˈrel-,
¦rä|
: an arbitrary numerical scale of intensity of seismic disturbances ranging from one for a barely perceptible tremor to 10 for an earthquake of the highest intensity
Word History
Etymology
after Michele Stefano De Rossi †1898 Italian geologist and François Alphonse Forel †1912 Swiss naturalist