Advisory 
If you arrived here by any means other than from the Index of Impacts,
 it is suggested that you start at the Introduction to gain an understanding of what follows.

Cape Verde Islands Impact
The Cape Verde Islands off the Northwest Coast od Africa
     The Cape Verde Islands Impact was a major event that shaped much of the North Atlantic Ocean as we know it today.

The 9 islands that form Cape Verde Islands lie on the 100 mile radius circle of the impact that formed them.
     The Cape Verde Islands about 400 miles west, off the north coast of Africa.  This is the 100 mile radius circle, the crater.  It seems probable that the meteor came in from the northwest, such that the circle of islands was formed to the southeast.

The 725 mile radius seismic circle is primarily defined by the seafloor in the North Atlantic.
      The 725 mile radius circle. Notice the deformities in the lines on the sea bottom, just at the circle. This image is linked to a much larger image (4,800 pixels wide) for a closer examination.
The Cape Verde Islands Impact, the Northeastern part of the 725 mile radius circle.
     Half way between the Cape Verde Islands and the Mid Atlantic ridge, these formations scribe another seismic circle. This is the North western part.
The Cape Verde Islands Impact, the Southwestern part of the 725 mile radius seismic circle.

     The South western part of the 725 mile seismic circle.


The tsunami from the Cape Verde Islands Impact extended this far.
     At 771 miles to the East there are a series of lines that look as if they could be the limits of the tsunami which occurred when the Cape Verde Impact hit.  This is in Southern Mauritania.
The extent of the tsunami, 250 miles inland and at 56 meters elevation.
     This series of lines is similar to, but much larger than, what might be seen on a beach at the high tide line. This image is linked to a larger image for more detail. This line is 250 miles inland and the surrounding land is 185 feet in elevation. That gives an idea as to how big this tsunami must have been.
The Cape Verde Islands Impact tsunami formed a natural dam on the Gorgol River.
     A closer view and at an angle shows that farthest east ridge line formed a natural dam on the Gorgol River, which allowed the lake to form. At the lowest spot on the ridge line, the lake broke through.
Irrigation dam across the Gorgol River at Foum Glaeta, Mauritania
    This dam was built where the lake broke through, as an aid to agriculture.

The Cape Verde Islands Impact seismic circle at 1170 miles radius.
     At 1170 miles radius, there is this circle on the ocean floor.  This image is linked to a much larger image.
The Romanche Fracture Zone buldged by this seismic circle
     At this distance, the seismic wave seems to have given the Romanche Fracture Zone a significant bulge.

The Mid Atlantic Ridge was fractured by the Cape Verde Islands Impact at 1465 miles raduis

     The Mid Atlantic Ridge is defined precisely from this circle at 1465 miles radius. Again, this image is linked to a larger image for closer inspection.

      From depths of 15,000 to 16,000 feet, the mid Atlantic Ridge rises to less that 10,000 feet in depth. This is a mountain range on the ocean floor. This impact cracked the floor of the Atlantic Ocean in this area, and this allows the lava to flow both East and West along this line. Mid Atlantic Ridge formation     This is similar to the Eurasia Impact that created a line of volcanoes in southern Europe and Western Asia at 1100 miles radius, and the impacts that created the Great Rift Valley in Eastern Africa, and others. The section of the Mid Atlantic Ridge, north of the Azores(top center) was formed by the Gibraltar Impact.

The 1465 mile radius circle through Morocco
To the northeast, this seismic wave passes Marrakech, Morocco as it passes through the mountains. A larger image is linked to this image.

The primary seismic phenonema associated with the Cape Verde Islands Impact
 The four seismic wave circles of the Cape Verde Impact at 100, 725, 1170, and 1465 miles radius.                          This image is expandable to 4800 pixels wide.

      For serious students, additional seismic circles have been noted at 1890, 3925, 4940 and 6700 miles radius.


Index of Impact Sites

Introduction

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© 2012, 2014 Terry Westerman