Exact Meaning: An appalled silence

Appalled by the Cambridge dictionary means: "having strong feelings of
shock or disapproval". On the other hand, it also means: "horrified".

There exists some ambiguity for me about the exact meaning of: an appalled silence.

Does it mean:

• A silence together with fear and distress
• A silence resulting from a shock (possibly as a natural result of a shock)

What does it mean exactly?