Fig. 6From: Unified approach for evaluation of horizontal site amplification factors with special reference to history of studies on the effects of surface geology on seismic motionComparisons of the empirical site amplification factors: a HSAF of the surface sensors relative to the seismological bedrock (HSAF_surface), b HSAF of the borehole sensors to the seismological bedrock (HSAF_borehole), and c the ratio between them (SBR), at 16 KiK-net sites in Aomori Prefecture and the overall geometrical means of all the 696 sites used (red broken lines)Back to article page