Occasionally, we may make DYFI products for smaller felt earthquakes or significant non-earthquake events (such as sonic booms or explosions) when we get significant numbers of felt reports. The origin information (location and time) of each earthquake is provided by the Advanced National Seismic System (ANSS) and its regional and national networks partners in the U.S. The DYFI Map and related products are created within minutes of each earthquake of magnitude 1.9 or greater. Estimating the felt areas of moderate earthquakes ( Boatwright and Phillips, 2012).Assessing the sampling bias of historic felt records ( Hough, 2013).Analyzing the differences in shaking for natural and injection-induced events ( Hough, 2014).Comparing intensity with the distribution of red and yellow tags for the Napa M6.0 earthquake ( Boatwright et al., 2015).Comparing the results of the National Seismic Hazard Maps with DYFI responses ( Mak and Schorlemmer, 2015).Providing intensity data and for USGS ShakeMap.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.ĭYFI data are now being used in a number of scientific applications. You also ensure that your area has been represented in the compilation of the maps of shaking. And best of all, with your help we can do so almost instantly.īy 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. 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. The Did You Feel It? (DYFI) system was developed to tap the abundant information available about earthquakes from the people who experience them. Intensity Plotįor further information, see Did You Feel It? Citizens Contribute to Earthquake Science (USGS Factsheet 2005-3016). Appendix II: Intensity Prediction Equations and the Distance vs.Appendix I: The DYFI Intensity Algorithm.Importance of Your Contribution and a Caveat.Aggregation: Combining Users’ Responses.What is Intensity? A Measure of Effects.

Quake map did you feel it