This brief article describes refinements to the Graves and Pitarka (2010) broadband ground‐motion simulation methodology (GP2010 hereafter) that have been implemented in version 14.3 of the Southern California Earthquake Center (SCEC) Broadband Platform (BBP). The updated version of our method on the current SCEC BBP is referred to as GP14.3. Our simulation technique is a hybrid approach that combines low‐ and high‐frequency motions computed with different methods into a single broadband response. The separate low‐ and high‐frequency components have traditionally been called deterministic and stochastic, respectively; however, this nomenclature is an oversimplification. In reality, the low‐frequency approach includes many stochastic...

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