How could geologists estimate the rate of motion of a fault?

htm. The rate of movement along a plate boundary can be determined by measuring the displacement of rocks or other features along the boundary. ... The San Andreas Fault has cut through this rock unit, dividing it into two parts which are now widely separated on opposite sides of the fault.

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a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.