Distinguish between Primary waves and Secondary waves.

Answer»

S.No.	Primary waves	Secondary waves
(i)	These waves are the fastest of all the Earthquake waves and the first to reach the epicentre.	Secondary waves travel less faster than the primary waves.
(ii)	These waves pass through solids, liquids and gases.	These waves travel only through solids.
(iii)	The average velocity of these waves is - 5.3 k.m/sec to 10.6 k.m/second.	The average velocity of these waves is 1 k.m/sec to 8 k.m/second.

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