Seismic Waves (P, S, L Waves) Explained | Shadow Zone & Gutenberg Discontinuity | Drishti IAS

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In this video, we explain the three major types of seismic waves—P Waves (Primary), S Waves (Secondary), and L Waves (Surface Waves)—in a simple and exam-oriented way by Mr. Vaibhav Shivhare, Expert Faculty at Drishti IAS.
P Waves (Primary Waves): Fastest waves, longitudinal in nature, and can travel through solids, liquids, and gases.
S Waves (Secondary Waves): Transverse waves, travel only through solids and cannot pass through liquids.
L Waves (Surface Waves): Slowest but most destructive waves, travel only along the Earth's surface.
This lecture also covers important concepts like:
Shadow Zone of P and S waves
Gutenberg Discontinuity (boundary between mantle and core)
Snell’s Law and refraction of seismic waves
Why P waves travel 1.7 times faster than S waves
Why S waves do not travel through liquid medium
How scientists study the interior of the Earth using seismic waves
This topic is highly important for UPSC,State PCS, and other competitive exams.
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