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Page "Seismology" ¶ 7
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Seismic and waves
Seismic waves are elastic waves that propagate in solid or fluid materials.
Seismic waves are studied by seismologists and measured by a seismograph or seismometer.
* Seismic waves
Seismic waves are vibrations that travel through the Earth's interior or along its surface.
Seismic waves are waves of energy that travel through the Earth, and are a result of an earthquake, explosion, or a volcano that imparts low-frequency acoustic energy.
Seismic waves are studied by geophysicists called seismologists.
Seismic waves pass relatively slowly through the asthenosphere compared to the overlying lithospheric mantle, thus it has been called the low-velocity zone ( LVZ ), although the two are not exactly the same.
Seismic shadowing occurs on the opposite side of the Earth from the earthquake epicenter because the liquid outer core refracts the longitudinal or compressional ( P-waves ) while it absorbs the transverse or shear waves ( S-waves ).
Seismic anomalies are identified by mapping variations in wave speed as seismic waves travel through Earth.
Seismic waves generated by large earthquakes enable structure below the Earth ’ s surface to be determined along the ray path.
Seismic waves that have traveled a thousand or more kilometers ( also called teleseismic waves ) can be used to image large regions of Earth's mantle.
Seismic waves produced by earthquakes or other sources ( such as explosions ) may be reflected by layers within the Earth.
Seismic waves are mechanical perturbations that travel in the Earth at a speed governed by the acoustic impedance of the medium in which they are travelling.
* Seismic waves
Seismic metamaterials, are metamaterials which are designed to counteract the adverse effects of seismic waves on man-made structures, which exist on or near the surface of the earth.

Seismic and by
In 1971 NORSAR ( Norwegian Seismic Array ) at Kjeller just outside of Oslo was connected by satellite to the SDAC ( Seismic Data Analysis Center ) in Virginia, USA as part of ARPANET in order to monitor nuclear test-ban treaties with the Soviet Union.
Seismic wave fields are recorded by a seismometer, hydrophone ( in water ), or accelerometer.
Covington is situated on the southeastern edge of the New Madrid Seismic Zone, an area judged by geologists to have a high risk of earthquakes in the future.
Seismic activity is monitored by the USGS Cascades Volcano Observatory located in Vancouver, Washington, which issues weekly updates ( or daily updates when significant eruptive activity is occurring at a Cascades volcano ).
" Seismic " was replaced by " Scientific " in the name, allowing the project to retain the designation ASC.
Seismic risk can be reduced by active programs that improve emergency response, and improve basic infrastructure.
Seismic activity caused by the lake's volcanic foundation could thus cause the lake wall to give way, resulting in up to 50 million cubic metres ( 1. 8 billion cu ft ) of water flooding downhill into areas of the Northwest Province and the Nigerian states of Taraba and Benue.
Seismic activity was dominated by tremor vibration and reports of visual intensity and sounds of eruption continued to be reported from the mountain monitoring facility, Bromo Observation Post.
In 1982 he ran the first international UUCP e-mail link at the machine seismo ( owned by the Center for Seismic Studies in Northern Virginia ), which evolved into the first ( UUCP-based ) UUNET.
Seismic evidence suggests that Teide may be constructed over the headwall scarp of the infilled Icod Valley, a massive landslide valley formed by edifice failure in a similar manner to that of the Güímar and Orotava Valleys.
Seismic moment is a quantity used by earthquake seismologists to measure the size of an earthquake.
Seismic moment is the basis of the moment magnitude scale introduced by Hiroo Kanamori, which is often used to compare the size of different earthquakes and is especially useful for comparing the sizes of especially large ( great ) earthquakes.
Seismic surveys are typically designed by National oil companies and International oil companies who hire service companies such as CGGVeritas, Petroleum Geo-Services and WesternGeco to acquire them.
Seismic data collected by the United States Geological Survey | USGS in the Gulf of Mexico
Seismic migration is the process by which seismic events are geometrically re-located in either space or time to the location the event occurred in the subsurface rather than the location that it was recorded at the surface, thereby creating a more accurate image of the subsurface.

Seismic and are
Seismic events are common in the Azores.
Seismic methods are preferred to magnetometers for oil exploration.
Seismic tomography has helped detect subducted lithosphere in regions where there are no earthquakes.
Seismic hazard refers to the study of expected earthquake ground motions at the earth's surface, and its likely effects on existing natural conditions and man-made structures for public safety considerations ; the results of such studies are published as seismic hazard maps, which identify the relative motion of different areas on a local, regional or national basis.
Seismic observations are made using seismographs deployed near volcanic areas, watching out for increased seismicity during volcanic events, in particular looking for long period harmonic tremors, which signal magma movement through volcanic conduits.
Seismic sounding of mid-ocean ridges has only revealed a few magma chambers beneath ridges, and these are quite thin.
Seismic imaging has recently shown that sediment layers are tilted, but how old this feature is has not yet been established.
Seismic data suggest that these volcanoes still contain active magma chambers, indicating that some Garibaldi Belt volcanoes are likely active, with significant potential hazards.
Seismic activity, gas concentrations, surface deformation, and temperature fluctuations are all carefully watched in order to mitigate the effects of a possible eruption.

Seismic and one
In one case, that against Seismic Entertainment Productions, the FTC accused the defendants of developing a program that seized control of PCs nationwide, infected them with spyware and other malicious software, bombarded them with a barrage of pop-up advertising for Seismic ’ s clients, exposed the PCs to security risks, and caused them to malfunction.
Auckland also has a Seismic Monitoring Network comprising six seismometers ( including one 250 m deep at Riverhead ) and three repeaters within the Auckland Region that will pick up the small tremors likely preceding any such volcanic activity.

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