downdip

(3)controls on the updip and downdip limits of the seismogenic zone of subduction thrusts;

③在俯逆上，发震带上界和下界的确定；

In addition, it is a principle to follow that the formation thickness of upfaulted block is greater than or equal to the downdip block in correlation of subzones as facing faults.

此外，遇到时，通常遵循正下降盘小厚度应该等于或者大于上升盘小厚度的原则。