The zone on Earth where no S-waves are detected is known as:
Shadow zone
Secondary or S-waves are transverse seismic waves that can travel only through solids, not through liquids.
Since Earth's outer core is liquid, S-waves get absorbed there and cannot pass through it, creating a region beyond about 103 degrees from the earthquake's epicentre where seismographs detect no S-waves.
This region of non-detection is called the shadow zone, and it is one of the key pieces of evidence used to establish that the outer core is liquid.
Hence, the zone where no S-waves are detected is known as the shadow zone.
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Important Questions from Geomorphology
Which one of the following is not an igneous rock?
Which of the following statements is/are correct?
1. Hypocenter is the point on the surface of the Earth, nearest to the focus.
2. Velocity of earthquake waves is higher in denser materials.
3. P waves move faster and are the first to arrive at the surface of the Earth.
Select the correct answer using the code given below:
Which one of the following is the lowermost/innermost intrusive igneous rock?
The formation of ‘tors’ on small rocky hills is associated with which among the following?
Which one of the following statements about metamorphic rocks is not correct?
