Fig. 8From: Directionally dependent horizontal-to-vertical spectral ratios of microtremors at Onahama, Fukushima, JapanDistribution of the peak frequency and the peak amplitude of a NS/UD and b EW/UD of MHVRs for points in Fig. 3. The colors indicate the peak frequency, and the size of the circles indicates the amplitude at the peak frequencyBack to article page