3/25/2023 0 Comments Seismac waveInstead it will flow away along the surface of the table. If you put the glass of water on the table and then somehow remove the glass, the water will not hold its shape. Now imagine that you have a glass of water. This is because those bonds between the atoms and molecules have a certain amount of shear strength and they can resist the pull of gravity and stay together. When you set the rock down, its molecules and atoms stay in place and the rock holds it shape. That rock is made up of atoms and molecules bound to each other. Liquids don't have any shear strength and so a shear wave cannot propagate through a liquid. When they reach the surface they cause horizontal shaking.ĭetailed explanation of why S-waves don't travel through liquids At a depth of 1,000 kilometers (620 miles), the waves travel more than 1 1 / 2 times that speed. Shear waves travel at 3.8 kilometers (2.4 miles) per second.īody waves travel faster deep within the earth than near the surface. S-wave : The S-wave (secondary, shear, or side-to-side wave) is slower than the P wave and arrives next, shaking the ground up and down and back and forth perpendicular to the direction it is traveling. When they reach the surface they cause vertical shaking. They can travel completely through the planet. At depths of less than 25 kilometers (16 miles), compressional waves travel at about 6.8 kilometers (4.2 miles) per second. The P-wave alternately compresses and expands material in the same direction it is traveling. P-Wave : The fastest wave, and therefore the first to arrive at a given location, is called the P-wave (primary or push-pull). The different types of energy waves shake the ground in different ways and also travel through the earth at different velocities. When an earthquake occurs, it releases energy in the form of waves that radiate from the earthquake source in all directions. Back to Background Material Seismic Waves
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