Something which rumbles is both unsettling and unsettled. By it's nature, it's unstable - in constant turmoil. So you refer both to the unstable thing - the storm; the earthquake - and to it's unstabilizing effect on you .
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CalifJimA rumble is a low-pitched, ominous sound. Hi, Jim,
I think you could make one of those on a good ol' pipe organ. My oldest son used to go screaming at the first chord of the