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PGA with >2% Probability Occurrence in 50 years About this map: This depiction of 2% earthquake peak ground acceleration exceedances across Puerto Rico is based on outputs from the US Geological Survey’s 2003 Puerto Rico and U.S. Virgin Islands Seismic Hazard Model. 2% is the standard hazard estimate for earthquake ground movement threats. The hexagonal grids utilized here provide a standardized method for overlaying multiple hazards each with different spatial representations. Average PGA is calculated for each hexagonal grid, representing 0.5 sq. miles, and is symbolized using an equal interval classifications scales. |