Dictionary
the branch of geology that studies earthquakes
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Wikipedia
Seismology (from the Greek languageGreek ''seismos'' = earthquake 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'', causes such as volcanoes and tectonic plates.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. The process of mapping subsurface features is a specialty called seismograph. Seismic waves produced by explosions have been used to map salt domes and other oil-bearing rocks, faults (cracks in deep rock), rock types, and long-buried giant meteor craters. For example, the Chicxulub CraterChicxulub impactor, which is believed to have killed the dinosaurs, was localized to Central America by analyzing ejecta in the cretaceous boundary, and then physically proven to exist using seismic maps from oil exploration.Using seismic tomography with earthquake waves, the interior of the Earth has been completely mapped to a resolution of several hundred kilometers. This process has enabled scientists to identify convection cells, mantle plumes and other large features of the inner Earth.SeismographSeismographs also effectively discover unusual, otherwise unobserved phenomena such as large meteors striking uninhabited ocean, or underground nuclear tests. Ocean meteor strikes as large as ten kilotons of TNT, (equivalent to about 4.2 × 1013 jouleJ of effective explosive force) have been reported.One of the first attempts at the scientific study of earthquakes followed the 1755 Lisbon earthquake.
Earthquake prediction - Main article: Earthquake predictionMost 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. Various attempts have been made by seismologists and others to create effective systems for precise earthquake predictions, including the VAN method. Such methods have yet to be generally accepted in the seismology community.
Seismologists - Beno GutenbergGutenberg, Beno Hiroo KanamoriKanamori, Hiroo Inge LehmannLehmann, Inge Giuseppe MercalliMercalli, Giuseppe John MilneMilne, John Andrija MohorovicicMohorovičić, Andrija Richard Dixon OldhamOldham, Richard Dixon Marquis of PombalSebastião de Melo, Marquis of Pombal Charles Francis RichterRichter, Charles Francis Vassilis PapazachosPapazachos, Vassilis Panayotis VarotsosVarotsos, Panayotis Indra Narayan GuptaGupta, Indra Narayan
See also - EarthquakeGeophysicsPlate tectonicsReflection seismologySeismometerVolcanologyIncorporated Research Institutions for SeismologyThe IRIS !ConsortiumCategory:Seismology< bara> !ca:Sismologiada:Seismologide:S eismologiees:Sismologíaeo:Sis mologiofi:Seismologiafr:Sismol ogieid:Seismologiit:Sismologia nl:Seismologieja:地震学no:S eismologipl:Sejsmologiapt:Sism ologiaro:Seismologieru:Сей мологияsv:Seismologitl :Seismologyth:วิทยา ผ่นดินไหวz h:地震学
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