The ground motion attenuation information available through this page will be updated and expanded as new or modified attenuation relationships become available.
Earthquakes are among the most deadly and expensive natural disasters affecting humankind.
Exposure and vulnerability to the effects of earthquakes is increasing as urban centers grow, especially in tectonically active areas. Clear, well-documented assessments of seismic hazard are the first and fundamental step in the mitigation process. The need to understand seismic hazard assessments has expanded from the professional seismic engineering and scientific communities to national, state, county, city, and local public officials, the private sector, educators at all levels, and the general citizenry. Demand for information has never been greater, nor has scrutiny of all steps of the processes that were used to produce the assessments. Both approaches require ground motion attenuation models.