verb (used with object), up·threw, up·thrown, up·throw·ing.
Examples from the Web for upthrow
The higher side is called the heaved or upthrow side; the opposite side the thrown or downthrow side.The Wonder Book of Volcanoes and Earthquakes|Edwin J. Houston
With dip faults the crop is carried forward (down the dip) on the upthrow side.
There has also been a certain amount of upthrow owing to the hydrostatic pressure.The Birth-Time of the World and Other Scientific Essays|J. (John) Joly
Thrust faults hade to the upthrow; the hanging wall has gone up.The Elements of Geology|William Harmon Norton