upthrow(n = noun.event) upheaval, uplift, upthrust - (geology) a rise of land to a higher elevation (as in the process of mountain building);
is a kind of ascension, ascent, rise, rising

   To throw up. Drayton. [1913 Webster]

   See Throw, n., 9. [1913 Webster]

upthrow, n.
1 the act or an instance of throwing upwards.
2 Geol. an upward dislocation of strata.