To some extent, they mean the same 'bad event', but
* has religious/supernatural tone; it is more abstract and affects 'big' entities.
* is more concrete, personal bad luck.
Being bitten by a dog is too personal to be called . And the influence of an earthquake is too big for to be called .
Other than that, the difference is a matter of usage and collocation. / (affected by something bad) are both fine; In the following (randomly picked in BCCWJ), cannot be used.
* _Woe to them that go down to Egypt for help; and stay on horses_ (usage)
* (religious)
* (big)
* (abstract)
* (fixed phrase)
is the opposite to _Blessed are..._ ; Also it is possible to say + to mean _affect negatively_ while is ungrammatical.
* * *
For , I think it is used almost exclusively in combinations with verbs given in the following (or verbs meaning very similar):
> ― ****
> ― **** ()
> ―― ****
> ― ****
>