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Mohorovicic discontinuity
Mo·ho·ro·vi·čić discontinuity M0369200 (mō′hə-rō′və-chĭch)n. The boundary between the earth's crust and the underlying mantle, averaging 8 kilometers (5 miles) in depth under the oceans and 32 kilometers (20 miles) in depth under the continents.
[After Andrija Mohorovičić (1857-1936), Croatian geophysicist.]Mohorovičić discontinuity (ˌməʊhəˈrəʊvɪtʃɪtʃ) n (Geological Science) the boundary between the earth's crust and mantle, across which there is a sudden change in the velocity of seismic waves. Often shortened to: Moho [C20: named after Andrija Mohorovičić (1857–1936), Croatian geologist]Mo·ho·ro·vi·čić discontinuity (mō′hə-rō′və-chĭch) The boundary between the Earth's crust and mantle. The Mohorovičić discontinuity is located at an average depth of 5 miles (8 kilometers) under the oceans and 20 miles (32 kilometers) under the continents. Scientists discovered this boundary because they noticed that the velocity of seismic waves increases sharply as the waves pass from the Earth's crust into the mantle.Thesaurus| Noun | 1. | Mohorovicic discontinuity - the boundary between the Earth's crust and the underlying mantle; "the Mohorovicic discontinuity averages 5 miles down under oceans and 20 miles down under continents"Mohogeology - a science that deals with the history of the earth as recorded in rocks |
Mohorovicic Discontinuity
Mohorovičić discontinuity[‚mō·hō′rō·və‚chich dis‚känt·ən′ü·əd·ē] (geophysics) A seismic discontinuity that separates the earth's crust from the subjacent mantle, inferred from travel time curves indicating that seismic waves undergo a sudden increase in velocity. Also known as Moho. Mohorovičić Discontinuity (also “Moho,” M-discontinuity), the boundary surface between the earth’s crust and mantle. The existence of the Mohorovičić discontinuity has been determined from seismic data; the velocity of longitudinal seismic waves passing downward through the Mohorovičić discontinuity jumps from 6.7–7.6 to 7.9–8.2 km/sec, and that of transverse waves jumps from 3.6–4.2 to 4.4—4.7 km/sec. Various geophysical, geological, and other data seem to indicate that the earth’s density at the discontinuity also increases substantially, from 2.9–3 to 3.1–3.5 t/m3. It is virtually certain that the Mohorovičić discontinuity separates strata of different chemical composition. The Mohorovičić discontinuity was named after A. Mohorovičić, who discovered it. AcronymsSeeMohoMohorovicic discontinuity
Related to Mohorovicic discontinuity: crust, Gutenberg Discontinuity, Convection currentSynonyms for Mohorovicic discontinuitynoun the boundary between the Earth's crust and the underlying mantleSynonymsRelated Words |