Basically, you enter a location in the search box and the map will tell you its risk level: lowest, very low, low, moderate, high, very high, and highest. Those categories are all color-coded, from dark blue to light blue to yellow to orange to red, so a zoomed-out look at the map gives you a handy overview of all the hot spots (and cold spots) in the country. To make the map, creators Byron Manley, Matt Stiles, and Renée Rigdon used a 2018 map from the U.S. Geological Survey that determined regional earthquake risk levels “based on seismicity and fault-slip rates” as well as “the frequency of earthquakes of various magnitudes.”