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The Conrad discontinuity (named after the seismologist Victor Conrad) is considered to be the border between the upper continental (sial, for silica-aluminium) crust and the lower one (sima, for silica-magnesium). It is not as pronounced as the Mohorovičić discontinuity and absent in some continental regions. [1]
Victor Conrad (1876 -1962) was an ... He was the first to deduce the continental crust transition structure which is now named the Conrad discontinuity. Studies and ...
Earth's crust and mantle, Moho discontinuity between bottom of crust and solid uppermost mantle. The Mohorovičić discontinuity (/ ˌ m oʊ h ə ˈ r oʊ v ɪ tʃ ɪ tʃ / MOH-hə-ROH-vih-chitch; Croatian: [moxorôʋiːtʃitɕ]) [1] – usually called the Moho discontinuity, Moho boundary, or just Moho – is the boundary between the crust and the mantle of Earth.
Changes in seismic wave velocities have shown that at a certain depth (the Conrad discontinuity), there is a reasonably sharp contrast between the more felsic upper continental crust and the lower continental crust, which is more mafic in character. [3] Most continental crust is dry land above sea level.
The base of the sial is not a strict boundary, the sial grades into the denser rocks of the sima. The Conrad discontinuity has been proposed as the boundary, but little is known about it, and it doesn't seem to match the point of geochemical change. [8] Instead, the boundary has been arbitrarily set at a mean density of 2800 kg/m 3. [4]
The transition zone is the part of Earth's mantle that is located between the lower and the upper mantle, most strictly between the seismic-discontinuity depths of about 410 to 660 kilometres (250 to 410 mi), but more broadly defined as the zone encompassing those discontinuities, i.e., between about 300 and 850 kilometres (190 and 530 mi) depth. [1]
Conrad, for his part, confesses he was with his ex-girlfriend because she found him during a panic attack — but says he wishes Belly had found him instead. The twosome then have a drunken moment ...
It is estimated that sima starts about 11 km below the Conrad discontinuity, [14] though the discontinuity is not distinct and can be absent in some continental regions. [15] Earth's lithosphere consists of the crust and the uppermost mantle. [16] The crust-mantle boundary occurs as two physically different phenomena.