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Refinements to initial Damping Ratio implementation

Andrew J. Makdisi requested to merge ghsc/users/amakdisi/nshmp-lib:dampscaling1 into main

Some modifications to UsgsDampingScaling.java to get results consistent with Rezaeian et al. (2014).

  • Converted dampingRatio to percentage within calcDSF and calcSigma methods.
  • Value returned from calcDsf is the lnDSF, which should be fine for tying in to other GMMs. Adjusted the main method to convert the scaleFactor via Math.exp for results checking.
  • Modified calcRho method to take damping ratio as input instead of DSF, converts dampingRatio to percent within the method.

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