Fig. 4From: Establishing a reference rock site for the site effect study in and around the Kathmandu valley, NepalAccelerograms of the earthquake No. 8 in Table 1 recorded at a displacement particle motions on horizontal plane. Low-cut filter is applied at 0.5 Hz to prevent the influence of noise, b the corresponding Fourier amplitude spectra of three components calculated using the time window of duration 20 s from 21, 22 and 46 s of the records of KKA, DMG and PKINBack to article page