Seismic wave | Wikipedia audio article
Channel: wikipedia tts
Date: 05/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Seismic_wave


00:01:04 1 Types
00:01:50 1.1 Body waves
00:02:21 1.1.1 Primary waves
00:03:04 1.1.2 Secondary waves
00:03:57 1.2 Surface waves
00:04:26 1.2.1 Rayleigh waves
00:05:13 1.2.2 Love waves
00:05:46 1.2.3 Stoneley waves
00:06:33 1.2.4 Normal modes
00:08:16 1.3 P and S waves in Earth's mantle and core
00:08:57 2 Notation
00:09:59 3 Usefulness of P and S waves in locating an event
00:12:39 4 See also



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SUMMARY
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Seismic waves are waves of energy that travel through the Earth's layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy. Many other natural and anthropogenic sources create low-amplitude waves commonly referred to as ambient vibrations. Seismic waves are studied by geophysicists called seismologists. Seismic wave fields are recorded by a seismometer, hydrophone (in water), or accelerometer.
The propagation velocity of seismic waves depends on density and elasticity of the medium as well as the type of wave. Velocity tends to increase with depth through Earth's crust and mantle, but drops sharply going from the mantle to the outer core.Earthquakes create distinct types of waves with different velocities; when reaching seismic observatories, their different travel times help scientists to locate the source of the hypocenter. In geophysics the refraction or reflection of seismic waves is used for research into the structure of the Earth's interior, and man-made vibrations are often generated to investigate shallow, subsurface structures.