The US and Canada Static Earthquake Risk Index is an indicator of earthquake risk exposure, derived from the percent chance a specified location will experience ground shaking strong enough to cause minimal structural damage in the next 100 years. This product covers the US and Canada and is made by attempting to harmonize seismic hazard maps for both countries. The strong shaking probabilities are derived from curves of seismic hazard for the US and Canada, published by the USGS and Geological Survey of Canada, respectively.
The Earthquake Risk Index is calculated from the percent chance a location will experience ground shaking equivalent to a Modified Mercalli Intensity (MMI) of VI or higher within the next 100 years. MMI is a measure of the intensity of ground shaking at a given location, and is based on the observed effects of past earthquakes. MMI level VI is characterized as "strong intensity", with heavy furniture movement and fallen plaster. At a minimum, damage is considered minor but would require potential repairs.
This seismic hazard product is provided for informational purposes only and should not be used for the planning or engineering of structures. Detailed geotechnical and site-specific engineering seismology studies conducted by qualified professionals are essential for accurate assessments. The creators, distributors, and providers of this product disclaim any liability for damages resulting from its use and emphasize the importance of consulting with experts to obtain reliable seismic hazard assessments tailored to specific projects.