Why do earthquake waves develop shadow zone Class 11?

(iii) Earthquake waves develop shadow zones because of the properties of each (P and S) waves as well as the core. Outer crust is liquid and hence S-waves, which can travel only through solid material, is blocked and cannot move across the core.

Why do earthquake waves develop shadow zone Ncert solutions?

Earthquake wave develop shadow zone because P and S waves follow a curved path inside the earth due to increasing capacity. The shadow zone of S-wave is much larger than that of the P-waves.

Can earthquakes occur in the shadow zone?

A seismic shadow zone is an area that receives only one type of seismic wave or, in some places, no seismic activity. There are two main types of seismic waves: Primary waves or P-waves are compressional waves that move in a forward and backward motion.

Why is there a shadow zone on the Earth opposite an earthquake focus?

P-Waves are able travel through solids, liquids, and gases while S-Waves can only travel through solids. Therefore, S-Waves cannot travel through the liquid out core. As a result, only P-Waves will be received on the side of the Earth opposite the earthquake epicenter. This zone is called the S-Wave Shadow Zone.

What is shadow zone Class 11?

The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Hence, they create troughs and crests in the material through which they pass. Thus, a zone between 105° and 145° from epicentre was identified as the shadow zone for both the types of waves.

What is earthquake wave 11?

Answer. 96.6k+ views. Hint: The energy and vibration that travels through earth’s layers when an earthquake , volcano or other explosion occurs, is called seismic wave. These waves travel through different layers of earth. As different layers have different densities, these waves get reflected and refracted.

How shadow zones are useful in understanding the properties of core region?

Seismic shadow zones have taught us much about the inside of the earth. This shows how P waves travel through solids and liquids, but S waves are stopped by the liquid outer core. The wave properties of light are used as an analogy to help us understand seismic-wave behavior.

Why do earthquake waves develop shadow zone Upsc?

The earthquake waves develop shadow zones because: (i)The P and S waves follow a curved path in the interior of the earth which proves that the density increases inside the earth. (iii)On reaching the core ‘S’ waves disappear and P waves are refracted as a result there is no wave for a distance.

What is the importance of shadow zone?

Why does a shadow zone occur for P waves quizlet?

Why is there a P-wave shadow zone? The P-wave shadow zone is the result of the refraction effects P-waves go through as they travel deep inside the Earth. It extends from 105 to 142 degrees.

Why do earthquake waves develop Shadow Zone Upsc?

What is shadow zone class11?

The shadow zone is the zone of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from P waves being refracted by the liquid core and S waves being stopped completely by the liquid core.