HR: 1330h
AN: S52A-0114    [PDF]
TI: A method for synthesizing strong ground motion by using filters for representing site, path and source characteristics.
AU: * Kinoshita, S
EM: kkk001@yokohama-cu.ac.jp
AB: An observed ground motion can be decomposed to site, path and source characteristics. Many studies were devoted to investigate these characteristics. On the basis of the results of those studies, we propose a new method to synthesis the ground motions at free field by means of the convolution of source, path, and site effects. The method based on filter theory assumes that source spectrum is the amplitude function of source filter driven by an impulse. This assumption introduces the causality of source filter. Thus, each filter has the impulse response of one-side function. As the results, site and path filters are constructed by minimum-phase filters. This means that the impulse responses of these two filters are calculated from only the amplitude functions of filters by using the Kramers-Kronig relation. On the contrary, source filter has the characteristics of a quasi-linear phase filter. The statistical characteristics of synthetic ground motion are calculated and compared with those of observed earthquakes, by using the convolution of impulse responses obtained from these three filters.
DE: 7212 Earthquake ground motions and engineering
SC: Seismology [S]
MN: 2003 Fall Meeting