Estimating Earthquake Intensity

After an earthquake occurs, geologists collect intensity data by communicating with people who were present in the area affected by the earthquake. These people are asked about two specific things: 1) their exact location when the earthquake occurred, and, 2) what they experienced and saw at that location during and after the earthquake. This information they provide is compared with the Modified Mercalli Intensity Scale and the intensity of the earthquake is estimated for that location.

Estimating intensity is not an extremely difficult job and with a little conscientious practice most people can obtain reasonable results. Give it a try. When you click on the link below, a pop-up window will appear. It will contain a sample observation and ask you to estimate the intensity. Close the pop-up window when you have done the three practice examples.