detonate an atom bomb.. but even that is a fire cracker compared
to a real earthquake.
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Earthquake.
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Probably a tallboy or earthquake bomb.
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An earthquake bomb:
♦ Earthquake bombs are bombs that unleash their total force
mostly into the ground, but instead of channeling them down into
the earth they unleash it as a underground blast wave, which can
create a man-made earthquake.
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The Thailand tsunami was generated by a major earthquake in the
sea.