PhysicsNEB 2080

Which of the earth quake waves is first recorded on the seismograph ? a) P waves b) Rayleigh Waves c) S Waves d) Love Waves GROUP: B Short answer questions 8 × 5 = 40 Shor answer questions.

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0:00Earthquakeoccurs (origin time)0:05P-waves arrive (~6km/s in crust)0:10S-wavesarrive (~3.5 km/s in c0:15Surface waves(Love, Rayleigh) (~2.5
Typical arrival sequence of seismic waves at a seismograph station

The P-waves (primary waves) are the first earthquake waves recorded on a seismograph. These are longitudinal waves that travel fastest through the Earth’s crust at approximately 6 km/s. Due to their high speed, they reach the seismograph station before other seismic waves. The sequence of wave arrivals is typically P-waves → S-waves → Surface waves (Love and Rayleigh waves). P-waves can travel through solids, liquids, and gases, making them detectable even in regions far from the epicenter.

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