Those are all probably just the underground shock. A seismograph will detect that, but the human senses won't. But usually where there is a small one there is a big one lurking around. I remember learning about an earthquake in CA many years ago that actually made the Mississippi river go backwards!
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 My Father circa 1985 holding a grouper and red snapper behind his 27' Scotticraft, Seaducer, with twin mercruisers - a member of the Bucket-Bow Boats.
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