DOWNTHROW
\dˈa͡ʊnθɹə͡ʊ], \dˈaʊnθɹəʊ], \d_ˈaʊ_n_θ_ɹ_əʊ]\
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A throwing down: specifically, in geol. a fall or sinking of strata below the level of the surrounding beds, such as is caused by a great subterranean movement: also, the distance measured vertically between the portions of dislocated strata where a fault occurs: opposed to upheaval (which see) or upthrow.
By Daniel Lyons
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dust storm
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