Seismic Waves:
Seismic waves generated by an earthquake source are commonly classified into two main types: the P and S waves. Both types are propagated within the Earth.
SEISMIC WAVES
A sudden dislocation of rocky material near Earth's surface"an earthquake"causes the entire planet to vibrate a little. Earth literally rings like a bell. These vibrations are not random, however.
Seismic waves are waves that travel through the Earth or other elastic body, for example as the result of an earthquake, explosion, or some other process that imparts forces to the body....
s. Earthquakes are recorded with a seismometer ...
Seismic Waves
A mechanical vibration that travels through the earth. Usually caused by an earthquake.
Seismograph ...
Seismic Wave - Waves that travel through the interior of a planet or satellite and are produced by earthquakes or their equivalent
Seismometers - Sensitive devices used to measure the strengths and arrival times of seismic waves ...
[edit] Seismic waves
As predicted beforehand, the collisions generated enormous seismic waves which swept across the planet at speeds of 450 km/s (280 mi/s) and were observed for over two hours after the largest impacts.
Seismic Wave Movie
This is a movie of the July 9, 1996 solar quake. The images were made using the Michelson Doppler Imager onboard the Solar and Heliospheric Observatory (SOHO) spacecraft, a joint European Space Agency/NASA project.
Seismic waves refract (bend) inside the Earth because of the change in speed of the waves as they move through material of variable density, composition, and temperature. Abrupt changes in direction occur at the boundary between two different layers.
seismic wave - (n.)
A wave created in a planetary or satellite interior, usually caused by an earthquake.
seismology - (n.) ...
Seismic Wave
The transfer of energy throughout a celestial object, such as a planet, resulting from an external impact or an internal event. On Earth, seismic waves are generated primarily by earthquakes.
Servicing Missions ...
First, seismic waves have their direction of motion changed (refracted) by variations in the interior density. Thus, by studying the way such waves propagate in the Earth we can learn something about density variations.
Diffraction of seismic waves provided the first clear-cut evidence for a lunar crust, mantle, and core analogous to those of the earth. The lunar crust is about 45 mi (70 km) thick, making the moon a rigid solid to a greater depth than the earth.
seismic waves (NASA Thesaurus) The disturbance of earth tremors produced by a mechanical disturbance on the surface or underground. Used for electroseismic effect.
When a sunquake occurs, energy is released in seismic waves on the relatively fluid surface of the Sun. These waves radiate in concentric circles from the epicenter of the sunquake.
These sound waves, and the modes of vibration they produce, can be used to probe the interior of the sun the same way that geologists uses seismic waves from earthquakes to probe the inside of the earth.
Seismic waves from each impact might be detectable for a day, and atmospheric waves for several days. Vortices and atmospheric hazes could conceivably persist for weeks. New material injected into the Jovian ring system might be detectable for years.
This information is used to compile harmonic oscillation modes for the Sun which provides details about the solar interior in much the same way as we use seismic waves to probe the Earth's interior.
After examining seismic waves from the 1909 Kulpa Valley earthquake, Mohorovicic theorized that a boundary between the Earth's crust and the upper mantle existed (about 50 km beneath the surface) in which the speed of earthquake waves became very ...
These waves make a star's surface pulse in and out in different places, as happens on Earth from the seismic waves of an earthquake.
After each impact, seismic waves rang through Jupiter's atmosphere, moving at 450 kilometres per second.
WEIRD TERRAIN - Region on the surface of Mercury of oddly rippled features. This feature is probably the result of a strong impact which occurred on the other side of the planet, and sent seismic waves traveling through and around the planet, ...
By monitoring the sun's vibrating surface, helioseismologists can probe the stellar interior in much the same way that geologists use seismic waves from earthquakes to probe the inside of our planet.
Seismic waves in earthquakes, of which there are three types, called S, P, and L.
Gravitational waves, which are fluctuations in the gravitational field predicted by general Relativity.
Gutenberg discovered that the Earth has a low-velocity zone in the upper mantle; this zone is now called the Gutenberg discontinuity. Gutenberg published a series of papers with Charles Richter (they were titled "On Seismic Waves" and published ...
 See also: Earth, Seismic Waves, Light, Time, Second
  
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