Ripple effect: Giants’ offense rakes vs. A’s

Like they did in Tuesday’s Bay Bridge series game in Oakland, the Giants found their offensive touch early on Thursday. Jarrett Parker doubled in his first at-bat since April, Brandon Belt notched his 18th homer — matching his career-high mark — and starter Ty Blach lifted his first career homer while pitching eight innings for an 11-1 rout of the A’s on Grateful Dead Tribute Night at AT&T Park.