FACTOID # 10: The total number of state executions in 2005 was 60: 19 in Texas and 41 elsewhere. The racial split was 19 Black and 41 White.

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Encyclopedia > Epicenter
The epicenter is directly above the earthquake's focus.

Seismic waves propagate spherically out from the hypocenter. After an earthquake has occurred, geologists can find out where the epicenter was located by triangulation of seismographic data from three or more different locations. Seismic shadowing occurs on the opposite side of the Earth from the earthquake epicenter because the liquid outer core absorbs the transverse or shear waves (S-waves), and refracts the longitudinal or compressional (P-waves). Body waves and surface waves Earthquake wave paths p-wave and s-wave from seismograph A seismic wave is a wave that travels through the Earth, most often as the result of a tectonic earthquake, sometimes from an explosion. ... Triangulation can be used to find the distance from the shore to the ship. ... Seismographs (in Greek seismos = earthquake and graphein = write) are used by seismologists to record seismic waves. ... Seismic shadow zone (from USGS) Seismic shadowing is a global effect of an earthquake. ... A light wave is an example of a transverse wave. ... A type of seismic wave, the S-wave moves in a shear or transverse wave, so motion is perpendicular to the direction of wave propagation. ... For the property of metals, see refraction (metallurgy). ... Longitudinal waves, also referred to as compressional waves or pressure waves, are waves that have vibrations along the their direction of travel. ... Plane P-wave Representation of the propagation of a P-wave on a 2d grid (empirical shape) One of the two types of elastic body waves (named because they travel through the body of the Earth) that are produced by earthquakes and recorded by seismometers. ...

The epicenter is usually the location of greatest damage. However, in some cases the epicenter is above the start of a much larger event. In these cases, damage may be spread across a larger area with the greatest damage possibly occurring some distance from the epicenter. For example, in the magnitude 7.9 2002 Denali Fault Earthquake in Alaska, the epicenter was at the western end of the rupture, but the greatest damage occurred about 330 km away at the eastern end of the rupture zone. Denali National Park and Preserve is located in Interior Alaska and contains Mt. ...

Results from FactBites:

 epicenter. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. (208 words) Epicenter is properly a geological term identifying the point of the earth's surface directly above the focus of an earthquake. The Panel is less fond but still accepting of epicenter when it is used to refer to the focal point of neutral or positive events. Sixty-two percent approve of the sentence The indisputable epicenter of Cortina's social life is the Hotel de la Poste, located squarely in the village center.
 How Do I Locate That Earthquake's Epicenter? (568 words) Figure 2 - Use the amplitude to derive the magnitude of the earthquake, and the distance from the earthquake to the station. The epicenter of the earthquake is somewhere on the edge of that circle. The point where all of the circles overlap is the approximate epicenter of the earthquake.
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