@ ŒfÚŽGŽi˜ajF “ú–{’nkHŠwƒVƒ“ƒ|ƒWƒEƒ€u‰‰W VolF 5Šª ”NF 1978”N •ÅF 217-224•Å ’˜ŽÒi˜ajF - ƒ^ƒCƒgƒ‹i˜ajF - ´˜^i˜ajF
- ƒL[ƒ[ƒhi˜ajF - ŒfÚŽGŽi‰pjF PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒi‰pjF Makoto KAMIYAMA ƒ^ƒCƒgƒ‹i‰pjF WAVE INTERPRETATION OF STRONG EARTHQUAKE GROUND MOTIONS ´˜^i‰pjF
A multiple filter technique is applied to strong earthquake ground motions in order to get nonstationary spectral characteristics. The analysis of several typical SMAC records obtained in Japan indicates that a significant portion of strong earthquake ground motion has a kind of regularity in nonstationary spectral characteristics. The regularity is explained by dispersion characteristics of surface waves. A simulation computation for surface waves propagating through a heterogeneous ground is carried out to verify the adequacy of the explanation. It is concluded that the principal motions of the SMAC records consist of surface waves. ƒL[ƒ[ƒhi‰pjF - ‹LŽ–‹æ•ªF - ‹æ•ª @@@ˆÏˆõ‰ï˜_•¶W