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I think "bomb" is convenient shorthand for "whatever causes a substantial environmental and anti-personnel disaster." We don't actually know what the causative event is, except that it is highly lethal and has a large, but not island-encompassing danger radius.
Calling it a "bomb" somewhat attributes to it a human cause. And I think most people expect, or at least are hoping, that the cause is a human agent. It would seem kind of silly if it were an accident or natural disaster. So even if it's a volcano or landslide or swamp gas or something, some person on the island or off it was acting on that to exploit it and ensure it did whatever it was it did.
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