1.0-second spectral response acceleration (5% of critical damping) with a 10% probability of exceedance in 50 years
A seismic hazard model for South America, based on a smoothed (gridded) seismicity model, a subduction model, a crustal fault model, and a ground motion model, has been produced by the U.S. Geological Survey.  These models are combined to account for ground shaking from earthquakes on known faults as well as …