Answer :
Beginning at depth 70 to 125 km, the seismic waves travel more faster than they do in shallower layers; this zone has been called plate tectonics.
What is a seismic wave?
An earth-passing acoustic wave is known as a seismic wave. It can be caused by a low-frequency acoustic explosion, a large landslide, a volcanic eruption, magma movement, a large earthquake, or another man-made event. Seismologists use seismometers, hydrophones (water-based recording devices), or accelerometers to capture and record seismic waves, which they then analyze. Seismic noise (ambient vibration), a persistent low-amplitude vibration that originates from a variety of natural and anthropogenic sources, is distinguished from seismic waves. A seismic wave's speed of propagation is influenced by the medium's density and elasticity as well as its type. Through the crust and mantle of the Earth, velocity tends to rise with depth but falls sharply as it approaches the outer core.
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