The word in the example sentence does not match the entry word. { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, }] These waves are dispersive, meaning that different frequencies have different velocities. to learn/know how to do a job or activity, Soft spots and big guns (Idioms and phrases in newspapers), Clear explanations of natural written and spoken English. The earliest responses include work by John Bevis (1757) and John Michell (1761). { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot' }}, There are two types of body waves, pressure waves or primary waves (P-waves) and shear or secondary waves (S-waves). },
{ bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, } "error": true, { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }}, {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, params: { For example, the Chicxulub Crater, which was caused by an impact that has been implicated in the extinction of the dinosaurs, was localized to Central America by analyzing ejecta in the Cretaceous–Paleogene boundary, and then physically proven to exist using seismic maps from oil exploration.[13]. name: "idl_env", { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_leftslot' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_rightslot' }}]}, [4], The Lisbon earthquake of 1755, coinciding with the general flowering of science in Europe, set in motion intensified scientific attempts to understand the behaviour and causation of earthquakes.
Since then, the normal modes of the Earth have given us some of the strongest constraints on the deep structure of the Earth.
}, Improve your vocabulary with English Vocabulary in Use from Cambridge.Learn the words you need to communicate with confidence.
var pbAdUnits = getPrebidSlots(curResolution); 'cap': true Processing readings from many seismometers using seismic tomography, seismologists have mapped the mantle of the earth to a resolution of several hundred kilometers. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot_flex' }}, Most seismologists do not believe that a system to provide timely warnings for individual earthquakes has yet been developed, and many believe that such a system would be unlikely to give useful warning of impending seismic events. { bidder: 'appnexus', params: { placementId: '11654157' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, What made you want to look up seismology? var pbHdSlots = [
Networks of seismographs continuously record ground motions around the world to facilitate the monitoring and analysis of global earthquakes and other sources of seismic activity. window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date; This has enabled scientists to identify convection cells and other large-scale features such as the large low-shear-velocity provinces near the core–mantle boundary.[15]. } { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, googletag.pubads().setTargeting("cdo_pt", "entry"); { bidder: 'ix', params: { siteId: '195464', size: [160, 600] }},
{ bidder: 'appnexus', params: { placementId: '11653860' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! googletag.pubads().setTargeting("sfr", "cdo_dict_english"); Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. expires: 365 Seismic waves are elastic waves that propagate in solid or fluid materials. iasLog("exclusion label : mcp"); { bidder: 'appnexus', params: { placementId: '11654208' }}, pbjsCfg = { { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, Rayleigh waves result from the interaction of P-waves and vertically polarized S-waves with the surface and can exist in any solid medium. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, iasLog("criterion : cdo_pt = entry"); P-waves are longitudinal waves that involve compression and expansion in the direction that the wave is moving and are always the first waves to appear on a seismogram as they are the fastest moving waves through solids. userSync: { Normal mode motion caused by a very large earthquake can be observed for up to a month after the event. name: "pubCommonId", googletag.pubads().setTargeting('ad_h', Adomik.hour); { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_btmslot_300x250' }}, { bidder: 'appnexus', params: { placementId: '11654157' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776130', position: 'btf' }}, }); Add the power of Cambridge Dictionary to your website using our free search box widgets. “Seismology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seismology. { bidder: 'appnexus', params: { placementId: '11654157' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_leftslot' }}]}, var dfpSlots = {}; Seismology definition is - a science that deals with earthquakes and with artificially produced vibrations of the earth. googletag.pubads().setTargeting("cdo_ei", "seismology");
"sign-out": "https://dictionary.cambridge.org/auth/signout?rid=READER_ID" { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, { bidder: 'ix', params: { siteId: '195451', size: [300, 250] }}, Controlled-source seismology has been used to map salt domes, anticlines and other geologic traps in petroleum-bearing rocks, faults, rock types, and long-buried giant meteor craters. A major long-term motivation for the global seismographic monitoring has been for the detection and study of nuclear testing. Various attempts have been made by seismologists and others to create effective systems for precise earthquake predictions, including the VAN method.
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[7], In 1906 Richard Dixon Oldham identified the separate arrival of P-waves, S-waves and surface waves on seismograms and found the first clear evidence that the Earth has a central core.
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