Horizontal-To-Horizontal Spectral Ratio
Horizontal-To-Horizontal Spectral Ratio : Spectral ratio of horizontal components at a target site to those at a reference site. If a reference site is virtually site-effect free, this corresponds to the true site amplification of the target site. Care must be taken to use a deep borehole station as a reference site, because seismic motions at depth are modified by the presence of the free surface differently from those at the surface. See Chapter 14 of this Manual and Kawase (2003)
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