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S waves are not recorded beyond approximately what angular distance from the epicentre?

Answer and explanation

Correct answer: Beyond about 105°

S-waves cannot pass through Earth’s liquid outer core. As a result, seismic stations located beyond roughly 105° from the epicentre do not normally receive direct S-waves; this region is called the S-wave shadow zone. Stations at smaller angular distances, such as 30° or 45°, can still record them. The value is approximate because the exact boundary depends on the Earth model and observational conditions.

Related tags

S-WavesShadow ZoneSeismologyEarthquakesOuter Core

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