Under what circumstances should we term a fault a downthrow?

The higher side is called the heaved or upthrow side; the opposite side the thrown or downthrow side.

The downthrow was not the work of one single act of disturbance—it went on for ages.

Dikes and faults are denominated upthrow or downthrow, according to the position they are met with in working the mine.

Normal faults, of which Figure 184 is an example, hade to the downthrow; the hanging wall has gone down.

A thrust fault with a hade of 30°, showing cliffs due to harder strata outcropping on the downthrow.

Normal faults are exemplified in figs. 1, 2, and 6; in the latter the masses A and B are on the downthrow sides, C is upthrown.

A dislocation is spoken of as a downthrow or an upcast, according to the direction in which it is approached.