• WordNet 3.6
    • n upthrow (geology) a rise of land to a higher elevation (as in the process of mountain building)
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Webster's Revised Unabridged Dictionary
    • n Upthrow (Mining) See Throw n., 9.
    • v. t Upthrow To throw up.
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Century Dictionary and Cyclopedia
    • upthrow To throw up; elevate.
    • n upthrow An upheaval; an uplift: in mining, the opposite of downthrow. Where a fault has occurred which has been attended by an up-and-down movement of the rock on each side, the displacement in the upward direction is called the upthrow, and that in the downward direction the downthrow. As a result of this motion, under great pressure, of the two adjacent rock-faces, it is sometimes observed that the bedding of the formation has been influenced in its position along the line of the fault, and to a greater or less distance from it, the dip being downward on the downthrow side and upward on the upthrow side of the fault. This is called by the miner “dipping to the down-throw” and “rising to the upthrow.” Also used attributively.
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Chambers's Twentieth Century Dictionary
    • v.t Upthrow up-thrō′ to throw up
    • n Upthrow an upheaval, an uplift
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In literature:

The upthrow comes swiftly on the moment of impact.
"Merchantmen-at-Arms" by David W. Bone
With dip faults the crop is carried forward (down the dip) on the upthrow side.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2" by Various
The upthrow comes swiftly on the moment of impact.
"Modern Essays" by John Macy