Sources/Usage: Public Domain.
The Did You Feel It? (DYFI) system was developed to tap the abundant information available about earthquakes from the people who experience them. By taking advantage of the vast number of Internet users, we can get a more complete description of what people experienced, the effects of an earthquake, and the extent of damage. And best of all, with your help we can do so almost instantly.
By contributing your experience of the earthquake, either immediately afterward, or whenever it is possible for you to do so, you make a contribution to the scientific body of information about each earthquake. You also ensure that your area has been represented in the compilation of the maps of shaking. This is a two-way street: not only will you add valuable information on the extent of ground shaking and damage, but in the process we hope you will learn more about how other communities fared and gain a greater understanding of the effects of earthquakes.
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