Abstract
Abstract We compile a data set of 585 weak, broadband, and strong ground-motion recordings from 184 earthquakes covering hypocentral distances ranging from 9 to 436 km in northeast India and the northwest Himalayas. Source-normalized vertical-component Fourier amplitude S -wave spectra are used to study path-attenuation characteristics, namely, geometrical spreading and quality factor, in the two regions. A trilinear model of geometrical spreading of R -1.0 for hypocentral distance R R 0.0 for R between 125 km and 140 km, and R -1.0 for R >140 km approximates the decay of low-frequency (1.0 Hz) amplitudes in northeastern India better than the conventional theoretical bilinear geometrical spreading of R -1.0 for R R -0.5 otherwise. In the northwestern Himalayas, the geometrical spreading is found to be R -1.0 , which is the same as that of a bilinear model at hypocentral distances R f , given by in the frequency range of 0.9–20 Hz.
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