The image above USES red arrows to represent the relative direction and magnitude of the ground movement in the vicinity of the quake.

When the bearing rings or washers relative rotation (radial or thrust bearings) or when the rolling elements in rolling direction of movement (linear bearings), the role of the load on the bearings.

By having the relative movement between magnetic field and target alternately reverse its direction, the effect of the magnetic field distortion can be compensated.