Definition of upthrow in English:

upthrow

verb

[WITH OBJECT]usually as adjective upthrown
Geology
  • Displace (a body of rock) upward on one side of a fault relative to the other.

    • ‘By way of contrast, regions on a fault's upthrown side have less load and so experience uplift.’
    • ‘This line was acquired over the upthrown block of the mapped Christchurch Fault.’
    • ‘They are often seen together with features called ‘horsts’, which are upthrown blocks lying between two steep-angled fault blocks.’

noun

Geology
  • An upward displacement of a body of rock on one side of a fault.

    • ‘The exploration geologist or geophysicist searching for these resources would be able to estimate that greater reserves would be preserved on the downthrow side of the fault, in contrast to its upthrow side.’

Pronunciation:

upthrow

/ˈəpˌTHrō/