shocked at something
shocked by something

But is he shocked by 0's actions or his power?

All three of them turned, shocked by the sudden sound.

Though shocked by the death, the residents said they were not surprised.

Then she shocked them both, probably even herself, by speaking of serious matters first.

For a moment she can't move, shocked by her body's betrayal.

Then, as if shocked by her own display of feeling, she rushed off.

But Tess was more shocked by the voice than the words.

She was both surprised and shocked by the news of his disappearance.

Grandfather did not seem very surprised or shocked by that.

She looked nearly as shocked by her own words as was he.