譁ｭ螻､霑大ｍ縺ｮ繝繧ｿ縺九ｉ謗ｨ螳壹＠縺溘☆縺ｹ繧雁ｼｱ蛹冶ｷ晞屬Slip-weakening distance observed at near-fault distance
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(2) Slip-weakening distance observed at near-fault distance s¥PNQ¹\ Eiichi Fukuyama, Takeshi Mikumo We successfully obtained the reliable estimate of slip-weakening distances (Dc) of the 2000 western Tottori earthquake (Mw6.6) and the 2002 Denali earthquake (Mw7.9) using near-fault seismograms. We examined the effect of spatiotemporal filtering due to a continuous propagation of rupture near the observation site. We used a 2-D in-plane rupture propagation model with constant rupture velocity and instantaneous slip at the crack tip as Green’s functions. As source time functions, we used a regularized Yoffe function which is a kinematically good approximation of dynamic slip weakening behavior. As a proxy of Dc, we used Dc’, which is defined as a slip at the time of peak slip velocity. We estimated Dc’ at about 0.3m for the Tottori earthquake estimated at GSH station (~100m away from the fault) and that at about 2.5m for the Denali earthquake at PS10 station (~3km away from the fault). We confirmed that both estimates are not affected by the spatiotemporal smoothing. !. !(ye«¸(slip-weakening distance, Dc). ¤ Yoffe ¶ (Tinti et al., 2005,. lºn ~ ,)R² AHE. BSSA),ºµ¶ T£,
(3) #. O9(zºd U %¾j l. `)Vi{, Dc’[ '. ºd bª,5M>LOJ). Dc ,pp* Dc [,r ' «¸. Ide and Takeo (1997,JGR)' !( µ. (y) ¶ $r¼ '¸*)V &(. ¶ , Dc p , . ' Dc ®o Z*) ,%. Guatterri and Spudich (2000, BSSA) µ . Dc’ Dc q)p§t 20%. B/J9c &( Dc ,®o Z). ) p§t 20%W_) y k. )Piatanesi et al. (2004, GRL) . *. ° Dc %'*). #. . !(x¶ + ¯ *)lº { "-|½,S Dc p o
(4) |½)V,. r¬] lº{2000 w¿g±. Mikumo et al. (2003, BSSA) r. lº · ©:D(GSH, y~100m) ´. ¼Rp*!(x¶ o ). 2002 w.H82=?Ilº · . a )!(³, Dc’p¡Dc’ Dc . Pump Station 10 (PS10, y~3km) ´,. »u &¬Y )V,. lº{ rv¦ ` '$. ". r ¬]*lº. {,r¼R !(¶ +( Mikumo et al. (2003) &( Dc ,p) ' p* Dc µB/J9 |½ ,h , [6CFKO6GM &( ;1<3) [6CFKO6GM Pp xX)À^3H<3 ¬] dm ¨(Aki and Richards, 2002) ,4IOM¶ . Dc’ GSH 0.3m, PS10 2.5m [6CFKO6GM,¦ ¿g ± l º Iwata and Sekiguchi (2002, MEXT Rep) {0M@O7GM,=?I lº q Dreger et al. (2004, GRL) { 0M@O7GM,f¢ nXx n µ!(³ AHEO9,p} r ' «¸ |½ Z,¦ * p[%r¼ '¸*)V &) µB/J9 |½ h V *.
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