Jonah admits that he is the problem (Jon 1:12-1:12)

“Jonah said to them.

‘Pick me up!

Throw me

Into the sea!

Then the sea

Will quiet down

For you.

I know

That it is because of me

That this great storm

Has come upon you.’”

Jonah was quite frank with these sailors.  He told them to pick him up and throw him into the sea.  Then the sea would quiet down for them.  He knew that this great storm came to them because of him, since Yahweh was mad at him.