Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A throwing upward.
  • n. Geology An upward displacement of rock on one side of a fault.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To throw or cast upwards.
  • v. To throw up (a mass of material) from below, causing a fault.
  • v. To be thrown up from below, causing a fault.
  • n. A fault in which a mass of material has been thrown up from below.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To throw up.
  • n. See throw, n., 9.

from The Century Dictionary and Cyclopedia

  • To throw up; elevate.
  • n. An upheaval; an uplift: in mining, the opposite of downthrow.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (geology) a rise of land to a higher elevation (as in the process of mountain building)

Etymologies

From up- +‎ throw. (Wiktionary)

Examples

  • This is termed the upthrow of the fault, as at B; and the downthrow, as at A.

    Farm drainage The Principles, Processes, and Effects of Draining Land with Stones, Wood, Plows, and Open Ditches, and Especially with Tiles

  • The words came in hoarse, croaked, suppressed accents, with a separation of the hands, and an upthrow of the head and projecting cars which had such a comical look of being crushed beneath the weight of the battened-down cap.

    Through Russia

  • For instance, de Beaumont suggested that the Pyrenees had been uplifted in a single sudden upthrow (en un seul jet) and that this elevation had occurred at the same time as that of the Alps. Von Buch and de Beaumont suggested that in the geological past there had occurred events on such an enormous scale as to be catastrophic in nature and without counterpart in the modern expe - rience of man.

    Dictionary of the History of Ideas

  • The upthrow comes swiftly on the moment of impact.

    “The Man-o’-War’s ’Er ’Usband”

  • As we can easily see, in an earthquake jar traveling from the opposite end of the earth, there should be no insurmountable difficulty in recognizing the jar, which is a direct upthrow from one which would tilt it to the right or left.

    The Scientific Monthly, October-December 1915

  • The other side of the semicircle was occupied by the upthrow of a low rise blocking off an horizon at its nearest point but a few hundred yards away.

    The Land of Footprints

  • Thrust faults hade to the upthrow; the hanging wall has gone up.

    The Elements of Geology

  • In Figure 184 the right side has gone down relatively to the left; the right is the side of the downthrow, while the left is the side of the upthrow.

    The Elements of Geology

  • After the upthrown block has been worn down to this level, differential erosion produces fault scarps wherever weak rocks and resistant rocks are brought in contact along the fault plane; and the harder rocks, whether on the upthrow or the downthrow side, emerge in a line of cliffs.

    The Elements of Geology

  • For the next half-mile, the river keeps to the upthrow side of the fault, the scarp of which blocks the tributary streams from the west, forming a number of small pools.

    A Study of Recent Earthquakes

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