Upthrew vs Upthrow - What's the difference?

As verbs the difference between upthrew and upthrow

is that upthrew is (upthrow) while upthrow is (archaic|poetic) to throw or cast upwards.

(geology) a fault in which a mass of material has been thrown up from below.

(head)

(upthrow)

(archaic, poetic) To throw or cast upwards.

*1819 , Lord Byron, Don Juan , II.29:

*:For fifty tons of water were upthrown / By them per hour [...].

(geology) To throw up (a mass of material) from below, causing a fault.

(geology, intransitive, of a mass of material) To be thrown up from below, causing a fault.

(en noun)