Starting with a LARGE VIEW of the MAR, the feature is almost concentric with the AFRICAN COASTLINE; this is not exact, since there is a PROGRESSION of TIDAL MOVEMENT RATES from 20.48 in the NW corner of the block of crust, to 30.72 mm/yr in the SW corner. Additionally, since this is a trigonometric SINE FUNCTION, there is gradual change of the INTERVAL TIME= DIAMETER/TIDAL RATE. This results in a RAPIDLY-MOVING BOUNDARY just north of the equator, vs. a movement NO MORE THAN 2/3rd of that rate in the NW corner:
Near 30N, there is a REVERSAL of the WESTWARD PROTRUSION, becoming EASTWARD. The CONVEX ORIENTATION consequently changes, indicating that the EARTH'S CRUST TIDAL RATES are influenced by the North American QUADRANT, Qsna- which is rotating OPPOSITELY TO Africa (ccw, rather than cw for the African portion north of the equator). Notice that the MAR has shifted from moving westward to eastward):
The maximum movement is NOT at the equator, but in the SW corner of the exhibited portion of the globe. Thereafter, the TIDAL RATE DECREASES from 30.72 to 16.24 mm/yr at the Equator (considering that this a simple sine function for a CIRCULAR GLOBE). This may be calculated according to the EQUATION:
Rate = 30.72- 20.48(SINE Angle) = 10.24mm/yr at the SE corner (not shown), and 30.72- 20.48(sine 45= .707)= 16.24 mm/yr at the south border (NOT EXHIBITED).
The MAXIMUM EXPANSION WESTWARD is exhibited at the 15N 48W coordinates (latitude and Longitude). The minimum is shown at 40N 30W, and all of the variation occurs in 40 degrees of latitude, where 15N is approximately in the SW corner (20N is the MIDPOINT of the portrayed portion of MAR). The 30N latitude is an important segment of the GLOBAL 360 degrees, and it is shown for the AZORES CHAIN:
Azores chain large view:
North of the Azores, there is another INFLECTION, and the MAR comes under the influence of Qsna- the NORTH AMERICAN QUADRANT. This segment is in the NE block of Qsna, and has proceeded since 100 m.y. ago.
Azores near 40N:
There is a change in the MAR, east of Newfoundland; this allows a CALCULATION of TIDAL RATES, so that we can determine ACCURACY. This has occurred at 100 m.y., and the AGES INDICATE CW ROTATION on the east side (CCW for Qsna):