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Seismology (from the Greek seismos = earthquake and
earthlink and logos = word) is the
scientific study of earthquakes and the movement of waves through the Earth. The
field also includes studies of variants such as seaquakes, as well as causes
such as volcanoes and tectonic plates. A related field is paleoseismology.
Earthquakes, and other earth movements, produce different types of seismic waves. These waves travel through rock, and provide an effective way to "see" events and structures deep in the Earth.
One of the earliest important discoveries was that the outer core of the Earth is liquid. Pressure waves pass through the core. Transverse or shear waves that shake side-to-side require rigid material so they do not pass through the core.
Most seismologists do not believe that a system to provide timely warnings for individual earthquakes has yet been developed, and some believe that such a system would be effectively impossible. More general forecasts, however, are routinely used to establish seismic hazard. Such forecasts estimate the probability of an earthquake of a particular size affecting a particular location within a particular time span.
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