The area on the surface of Earth where P waves and S waves are not recorded by seimograms following an earthquake event are referred to as

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Shadow zones are areas on the Earth's surface where seismic waves (specifically P waves and S waves) from an earthquake are not detected by seismographs. This phenomenon occurs due to the refraction and reflection of these waves as they encounter different layers within the Earth, particularly the core, which affects their propagation and results in areas where the waves do not reach.

The Area on the Surface of Earth Where P Waves