Consider the following about earthquake and earthquake waves and choose the correct one s The point ...........

Geography Disasters and Management issues

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Consider the following about earthquake and earthquake waves and choose the correct one/s

The point on the surface nearest to the focus is called Epicentre
The velocity of earthquake waves decreases as the density of medium increases.
P-waves move faster and are the first to arrive at the surface

Code

1 and 2

1 and 3

2 and 3

all of the above

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Explanation:

Earthquake originates at focus or hypocentre. Point on eart's surface vertically above the focus is called epicentre.

The velocity of earthquake waves increases as the density of medium increases.

P-waves are fast travelling waves, they arrive first, they can travel in solid and liquid. S- waves are slower and take twice the time as Pwaves. Long waves (L-waves) follow the circumference of earth and travel at a constant rate. L - waves are also called as surface waves.