Fig. 13From: Real-time seismic intensity prediction using frequency-dependent site amplification factors a Horizontal component and b vertical component of observed spectral ratios of each earthquakes between YMT015 and YMTH06 (surface). Earthquakes with the backazimuth angle of 120–180 degree are plotted in red, while those with the other angle are in black. Frequency characteristics of site-correct filters are plotted in white broken lines Back to article page