000019961 001__ 19961
000019961 005__ 20170118182348.0
000019961 04107 $$aeng
000019961 046__ $$k2017-01-09
000019961 100__ $$aYagi, Satoru
000019961 24500 $$aAn Efficient Detection Method of the Peak Frequency of Microtremor H/V Spectral Ratio Using a Low-Pass Filter

000019961 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019961 260__ $$b
000019961 506__ $$arestricted
000019961 520__ $$2eng$$aThe present study aims at proposing a method to evaluate the peak frequency in the microtremor H/V spectra efficiently. The proposed method deals with the spectra as the time series data and applies fast Fourier transform (FFT) to the H/V spectra as the first process. In the next process, both the constant term indicating the average of the time series data and the (m+1)th harmonics and higher are removed and treated as zero. As the results, from the first to the (m)th harmonics in the spectra were remained. The remained spectra were assumed as the smoothed spectra and by applying the inverse fast Fourier transform (IFFT), the smoothed spectra without insignificant ripples were obtained. The major advantage of the proposed method is the fact that the coherent predominant peak frequency can be evaluated irrespective of the value of the peak frequency. Authors apply both the proposed method and the ordinal method to 10 observed microtremor H/V spectral ratios with different characteristics in the spectra. Predominant peak frequencies may be evaluated by the cautious evaluation of the skilled engineers without the help of the proposed method, however, it should be noticed that the predominant peak frequencies can be evaluated very easily by the proposed method.

000019961 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019961 653__ $$apeak frequency, microtremor H/V spectral ratio, low-pass filter

000019961 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019961 720__ $$aYagi, Satoru$$iNagao, Takashi$$iNozu, Atsushi$$iIto, Yoshihiro$$iYamada, Masayuki
000019961 8560_ $$ffischerc@itam.cas.cz
000019961 8564_ $$s1867197$$uhttps://invenio.itam.cas.cz/record/19961/files/481.pdf$$yOriginal version of the author's contribution as presented on USB, paper 481.
000019961 962__ $$r16048
000019961 980__ $$aPAPER