About our seismic hazard data

Maps of landslide zones, liquefaction zones and Alquist-Priolo Earthquake Fault Zones all come from the California Geological Survey. It's important to note that because of minor differences in the ways maps can be displayed, our maps may be slightly different than their official counterparts. myFault will give you a good sense of nearby seismic hazards, but you should ALWAYS verify that with official state maps.

The state's landslide and liquefaction zones also do not cover the entire state. For now, they primarily cover the San Francisco Bay Area and parts of Southern California. DO NOT assume that just because our maps show that you are outside of a landslide or liquefaction zone that you will not be affected by those hazards.

One geological feature myFault does not yet map are fault lines, as determined by the United States Geological Survey. We hope to add those in the future, but for now we are mapping only Alquist-Priolo Fault Zones, which are state-defined areas that have a high likelihood of surface rupture during an earthquake. In practice, they often represent clusters of some of California's most active faults.

REMEMBER: myFault's mapping features work only in California!

Earthquake safety checklist

Our earthquake safety checklist is based on guides written by the American Red Cross, the Federal Emergency Management Agency and the Los Angeles Fire Department. We recommend you give those documents a read, as they offer many useful tips we did not have space to include.