code: def get_mean_and_stddevs(self, sites, rup, dists, imt, stddev_types):
          
          mean, stddevs = super().get_mean_and_stddevs(
              sites, rup, dists, imt, stddev_types)
  
          # this is the firm ground adjustment
          mean += np.log(1.162)
  
          return mean, stddevs
docs: See :meth:`superclass method
          <.base.GroundShakingIntensityModel.get_mean_and_stddevs>`
          for spec of input and result values.