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Add basin effects to non-NGAW2 GMMs

Created by: pmpowers-usgs

In order to consider basin effects everywhere throughout the WUS, subduction interface and slab GMMs need to have an amplification term added. Art Frankel recommended we use the Campbell and Bozorgnia 2014 (NGAW2, z2p5) model. This needs to be added to BcHydro, Atkinson & Macias, and Zhao06. In order to not disrupt the existing models, this additions should be handled via subclasses that will have their own identifiers (e.g. ZHAO_06_INTER_BASIN).

  • Expose CB14 basin term
  • A&M09 subclass
  • BcHydro12 subclasses
  • Zhao06 refine site-vs30 interpolation
  • Expose Zhao16 site class
  • Refactor exiting SiteClass to GmmUtils.CeusSiteClass
  • Clean Zhao06 coeffs to match pub; precision