Question
Primary and Secondary Seismic Waves
| Primary Seismic Waves | Secondary Seismic waves |
| (i) Primary waves are the first one to reach the surface of the earth after the energy is emitted in the Earth’s interior. | (i) The waves which reach the Earth’s surface after the primary waves are called secondary waves. |
| (ii) Primary waves can travel through solid, liquid and gaseous medium. | (ii) Secondary waves can travel only through only solid medium. |
| (iii) While travelling through liquid medium, primary waves change their direction. | (iii) Secondary waves get absorbed as they enter the liquid medium. |
| (iv) The waves move to and fro in the direction of energy transfer. | (iv) These waves move up and down in the direction of energy transfer. |
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