NGA‐West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes

We provide ground motion prediction equations for computing medians and standard deviations of average horizontal component intensity measures (IMs) for shallow crustal earthquakes in active tectonic regions. The equations were derived from a global database with M 3.0–7.9 events. We derived equations for the primary M ‐ and distance‐dependence of the IMs after fixing the V S 30 ‐based nonlinear site term from a parallel NGA‐West2 study. We then evaluated additional effects using mixed effects residuals analysis, which revealed no trends with source depth over the M range of interest, indistinct Class 1 and 2 event IMs, and basin depth effects that increase and decrease long‐period IMs for depths larger and…

• CD
  California Department of Transportation
• CE
  California Earthquake Authority
• UG
  U.S. Geological Survey
• NS
  Natural Sciences and Engineering Research Council of Canada