The S wave shadow zone

The S wave shadow zone is the area of the Earth’s surface where S waves are not detected following an earthquake. This shadow zone has led geologists to a model of the Earth with a solid mantle and a liquid core. From the diagram, we can see the region where S waves are not detected. Geologists have been able to calculate the size of the liquid core from these measurements.

Diagram showing the curved path of S waves through the Earth. They travel through the mantle but cannot pass through the liquid outer core.
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