000010583 001__ 10583
000010583 005__ 20141205155742.0
000010583 04107 $$aeng
000010583 046__ $$k2008-10-12
000010583 100__ $$aKurahashi, Susumu
000010583 24500 $$aPhase-Dependent Site Effects Empirically Estimated

000010583 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010583 260__ $$b
000010583 506__ $$arestricted
000010583 520__ $$2eng$$aWe developed a method for estimation of site effects in time function using observed records. So far, most of the empirical methods estimate the site effects with only amplitude spectra. Phase characteristics of the site effects have been assumed to be random in simulating strong ground motions. In this study, we attempt to separate the site effects in time domain from observed records. The site effects estimated in the above method are generally different for individual earthquakes. There are coherent site effects commonly included in different records and incoherent ones varying in different records. The coherent site effects are estimated by stacking the site effects in frequency domain synchronizing the onsets of S-waves from individual earthquakes. The incoherent site effects are estimated as power spectra subtracting the power spectra of the coherent site effects from those of the total site effects. The amplitude characteristics of the site effects are estimated as the sum of the amplitude spectra of the coherent ones and square root of the power spectra of the incoherent ones. The phase characteristics of the site effects are given the same as those of the coherent ones. The site effects in time domain are estimated by the inverse Fourier transform of those calculated above in frequency domain. We applied this method to estimating strong ground motions of the 2003 Tokachi-oki earthquake by the stochastic Green’s function method including the empirical site effects. We found the synthesized ground motions agreed well with the observed records.

000010583 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000010583 653__ $$aempirical site effects, phase-dependent site effects, simulation of ground motion

000010583 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010583 720__ $$aKurahashi, Susumu$$iMasaki, Kazuaki$$iIrikura, Kojiro
000010583 8560_ $$ffischerc@itam.cas.cz
000010583 8564_ $$s361548$$uhttps://invenio.itam.cas.cz/record/10583/files/02-0118.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 02-0118.
000010583 962__ $$r9324
000010583 980__ $$aPAPER