HIGH-FREQUENCY FOURIER SPECTRA OF STRONG MOTIONS : fmax and stress drop
強震動の高周波フーリエスペクトル特性 : fmaxと応力降下量

Toshimi SATOH, Yoshihisa KOBAYASHI, Kazuhiko YASHIRO
2000 Journal of Structural and Construction Engineering (Transactions of AIJ)  
We estimated stress drop and 丘nax of subduc 口on earthquakes using strong motion records obselved at deep boreholes in Iwaki and Tomioka in order to evaluate high− f士equency strong motions . τhe estimated ax has no correl飢 ion with seismic moment . On the other hand , we fbund that the stress drop is proportional to fi 刀 ax3 . Although the level of stress drop depends on source regions , this relation is appricabie to each source region . By subsllIuting this relation to ω 一 2 model , we show
more » ... ctraI amplimdes of acceleration source spectra in the f士equency range higher than fmax are scaled by only SeiSmiC mOment . Keywordsfmax , 5舵 ∬ 伽 P , ω 一 2 mo ( 姆 , bo励 〔 ) le, strong motion ,垣帥 一 介eq ロe η (ry spectr ロm
doi:10.3130/aijs.65.79_1 fatcat:u3e45enw45cb7px6c37adfum7a