Epicentre of earthquake? (5)

I believe the answer is:

heart

I'm a little stuck... Click here to teach me more about this clue!

'epicentre of earthquake?' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Maybe you can see a link between them that I can't see?

This is all the clue.

Can you help me to learn more?

(Other definitions for heart that I've seen before include "Feeling" , "Core, courage" , "Playing card - pity" , "Muscular organ - compassion" , "Not a club" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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