@ ŒfÚŽGŽi˜ajF “ú–{’nkHŠwƒVƒ“ƒ|ƒWƒEƒ€˜_•¶W VolF 9-1Šª ”NF 1994”N •ÅF 289-294•Å ’˜ŽÒi˜ajF ‰ª–{@NC@‘ò“c@•×C@•½”ö@Œ‰C@’ÒŒ´@Ž¡ ƒ^ƒCƒgƒ‹i˜ajF ‰”’¼ƒAƒŒ[ŠÏ‘ª‹L˜^‚É‚æ‚é’n”Õ‚Ì‚r”g‘¬“x‚Æ‚p’l‚Ì•”•ª“¯’è ´˜^i˜ajF
- ƒL[ƒ[ƒhi˜ajF - ŒfÚŽGŽi‰pjF PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒi‰pjF Yasushi OKAMOTO, Tsutomu SAWADA, Kiyoshi HIRAO, Osamu TSUJIHARA ƒ^ƒCƒgƒ‹i‰pjF LOCALIZED IDENTIFICATION OF S-WAVE VELOCITY AND QUALITY FACTOR OF SUBSURFACE LAYERS BY USING VERTICAL ARRAY RECORDS ´˜^i‰pjF
In this study, a localized identification method is developed, which identifies dynamic soil properties such as shear wave velocity and quality factor in specified subsurface layers by using vertical array records of earthquake ground motion. The method is formulated in frequency domain by using multi-reflection theory. In order to reduce noise effect in frequency-domain analysis, we introduce the smoothing technique into not only the theoretical spectrum but also the observed one. ƒL[ƒ[ƒhi‰pjF - ‹LŽ–‹æ•ªF - ‹æ•ª @@@ˆÏˆõ‰ï˜_•¶W