downthrow

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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.

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Definitions (2)

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  1. In mining, a dislocation of the strata by which any bed of rock or seam of coal has been brought into a position lower than that it would otherwise have occupied. See dislocation and fault.

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Examples (13)

  • 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
  • A fault of recent date may be marked at surface by a scarp, because the face of the upthrown block has not yet been worn to the level of the downthrow side 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
  • Normal faults, of which Figure 184 is an example, hade to the downthrow; the hanging wall has gone down. —  The Elements of Geology
  • The escarpments, however, are due in a large degree to the erosion of weaker rock on the downthrow side. —  The Elements of Geology
  • A thrust fault with a hade of 30 degrees, showing cliffs due to harder strata outcropping on the downthrow. —  The Elements of Geology
 

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