"Shocked silence" refers to a moment or state where people are incredibly surprised or stunned, causing them to become speechless and not say anything for a period of time. Full definition
But when I used it in my middle school class a few years ago I knew something was up by the complete shocked silence and looks of terror on the kid's faces. (colorandgrace.com)
I violently dislike you,» she said, and then she was gone, slamming the door and leaving a sort of shocked silence behind. (goodreads.com)
Screams, gasps, «I did NOT just see that», Domino's delivery, and PoolMan's shocked silence later, we were again horribly scarred for life. (mutantreviewers.wordpress.com)