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[doun-throh] /ˈdaʊnˌθroʊ/
a throwing down or being thrown down; overthrow.
Origin of downthrow
First recorded in 1605-15; noun use of verb phrase throw down Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for downthrow
Historical Examples
  • Under what circumstances should we term a fault a downthrow?

    Geology James Geikie
  • The higher side is called the heaved or upthrow side; the opposite side the thrown or downthrow side.

  • The downthrow was not the work of one single act of disturbance—it went on for ages.

    Australian Pictures Howard Willoughby
  • Dikes and faults are denominated upthrow or downthrow, according to the position they are met with in working the mine.

  • Normal faults, of which Figure 184 is an example, hade to the downthrow; the hanging wall has gone down.

    The Elements of Geology William Harmon Norton
  • A thrust fault with a hade of 30°, showing cliffs due to harder strata outcropping on the downthrow.

    The Elements of Geology William Harmon Norton
  • Normal faults are exemplified in figs. 1, 2, and 6; in the latter the masses A and B are on the downthrow sides, C is upthrown.

  • A dislocation is spoken of as a downthrow or an upcast, according to the direction in which it is approached.

    Geology James Geikie
British Dictionary definitions for downthrow


the state of throwing down or being thrown down
(geology) the sinking of rocks on one side of a fault plane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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