What is intensity?

Intensity and magnitude are concepts which are frequently confused. These links primarily explain the use of the Modified Mercalli Intensity Scale to describe the "effects" of earthquakes. Other intensity scales have been used in the past and in other countries. If you recently experienced an earthquake and want to contribute to an intensity study, fill out a felt report for the nearest institution.

The Modified Mercalli Intensity Scale - from theUSGS, NEIC
Earthquake Intensity - from the University of Nevada, Reno
Earthquake Intensity - from St. Louis University

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Berkeley Seismological Lab
215 McCone Hall, UC Berkeley
Berkeley CA 94720-4760
www@seismo.berkeley.edu