GRIDLINES show that the shear was oriented N274W from Goat Island, and this is more than the N250W exhibited at Penn Cove, WA (to the south 16 km). This represents a 24 degree CCW shift during the TIME INTERVAL of 62,500 to 15,625, or 46,875 years (.5 degrees/k.y. or 3.6 degrees/7.2 k.y.). I archive these ratios, hoping to find the relation to the repetitive 100:1 ratio of 3.6 degree polar shifts each 40.96 m.y. (with the original at 4.096 b.y. instigation).
Why is the diffraction wave pattern enclosed in a circular configuration? This portion, or half of the ellipse, is due to the rotation of the 100 k.y. feature- which is an expanding-contracting entity during the 100 k.y. time interval.