Influence of magnitude and hypocentral distance on H/V spectral ratio of seismic signal

This paper computes H/V spectral ratio between 0.5 Hz and 15 Hz of seismic records from the ten stations of the Himalayan array located in Sichuan Province, and the influence of magnitude and hypocentral distance on the H/V spectral ratio is analyzed. Finally the H/V spectral ratios of seismic signals are compared with those of microtremor. The results indicate that the magnitude almost has no influence on amplitude and peak frequency of H/V spectral ratio of seismic signal. On the other hand, hypocentral distance has no influence on amplitude shape and peak frequency of H/V spectral ratio of seismic signal when the spectra peak is obvious, whereas when the spectra peak is not obvious, it may have some influence on the peak frequency. For the stations with obvious spectra peak, peak frequency of H/V spectral ratio of seismic signal is coincident with that of microtremor, while different from each other for the stations without obvious spectra peak.