ShakeMap

The USGS ShakeMap system is a tool for the real-time generation of ground-shaking maps following significant earthquakes.
ShakeMaps provide vital information within minutes after an earthquake to emergency response agencies, the media and the general public.
ShakeMaps are produced on the basis of observed ground motion values (peak velocities, peak accelerations, and spectral accelerations) and complemented by calculated values using empirical attenuation relationships.

The USGS ShakeMap system is a tool for the real-time generation of ground-shaking maps following significant earthquakes.