Volcanoes and Earthquakes

What is the modified Mercalli Scale?

The modified Mercalli Scale is a means of measuring the intesity of an earthquake. Unlike the Richter scale, which uses mathematical calculation to measure seismic waves, the modified Mercalli Scale uses the effects of an earthquake on the people and structures in a given area to determine its intensity. It was invented by Guiseppe Mercalli (1850–1914) in 1902 and modified by Harry Wood (1879–1958) and Frank Neumann in the 1930s to take into consideration such modern inventions as the automobile and the skyscraper.


This is a web preview of the "The Handy Science Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App