The seismic shadow zone for secondary (S) waves extends beyond what angular distance from an earthquake epicenter?

💡 Solution & Explanation

Secondary or transverse seismic waves cannot travel through liquids and are therefore completely absorbed by the Earth's liquid outer core, creating a shadow zone that starts at an angular distance of 103 degrees from the earthquake epicenter. Other options such as 142 degrees mark the boundary where primary waves reappear after refraction, whereas 180 degrees represents the antipodal point. Seismologists rely on these specific shadow zone angles to accurately map the internal layered structure and physical state of the Earth's interior.