This quiz and worksheet is a great way to test your knowledge of seismic waves! 15. 1. They are also known as Earthquake waves. When an earthquake occurs, the shockwaves of released energy that shake the Earth and temporarily turn soft deposits, such as clay, into jelly (liquefaction) are called seismic waves, from the Greek ‘seismos’ meaning ‘earthquake’. 2. Tsunamis, or seismic sea waves, are generated by seismic disturbances beneath the ocean floor. They can pass through solids, liquids and gases easily. Internal waves are not well understood but are thought to form at density interfaces beneath the ocean surface, especially in connection with the pycnocline.
As they travel through rock, the waves move tiny rock particles back and forth -- pushing them apart and then back together -- in line with the direction the wave is traveling. Earthquakes generate four principal types of elastic waves; two, known as body waves, travel within the Earth, whereas the other two, called surface

Seismic waves are usually generated by movements of the Earth’s tectonic plates but may also be caused by explosions, volcanoes and landslides.
Seismic waves are studied by seismologists using an instrument called seismograph, which records the frequency and amplitude of the waves to study Earth’s subsurface activities. Seismic Waves are created when energy builds up in rocks and causes them to fracture. Result of an earthquake, explosion, or a volcano that imparts low-frequency acoustic energy. Tsunamis have been known to cause large scale damage and take tens of thousands of lives. Seismic wave, vibration generated by an earthquake, explosion, or similar energetic source and propagated within the Earth or along its surface. 3. Waves of energy that travel through the Earth. Primary waves (or P waves) are the fastest moving waves, traveling at 1 to 5 miles per second (1.6 to 8 kilometers per second). There are three different types of seismic waves: – P-waves, S-waves and Surface waves. P-waves or Primary waves are the fastest of all the three and cause just a slight vibration. The time taken by seismic waves to arrive at seismic observatories allows … 14.

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