This one is ratty, which impedes identification, so I originally posted as "Catharus species?" I didn't see any red in the tail, and there looked to be "spectacles," so I leaned toward Swainson's Thrush. Expert respondents pointed out in addition that the brown of the upperparts is relatively warm, and that August would be early for a Hermit Thrush in Santa Cruz. So, Swainson's Thrush.