Conrad discontinuity

Japanese: コンラッド不連続面（英語表記）Conrad discontinuity

At the boundary between granite and basalt layers in the crust, there is a discontinuity in the velocity of seismic waves. This is called the Conrad discontinuity. In shallow granite layers, the velocity of longitudinal waves is 5.5 km/sec, and in deep basalt layers, 6.5 km/sec. This discontinuity does not exist in oceanic regions, but in the continental crust, it is thought to be located at a depth of 15 to 25 km. Several tens of kilometers below is the Mohorovicic discontinuity, which is the boundary between the crust and the mantle.

Source: Asakura Publishing Dictionary of Laws Information

Japanese:

地殻における花崗岩層と玄武岩層との境に，地震波速度の不連続面がある．これをコンラッド不連続面という．浅い花崗岩層では縦波速度は5.5km/sec，深い玄武岩層では6.5km/secである．大洋地域にはこの不連続面は存在しないが，大陸地殻では15～25kmの深度にあると考えられている．数十km下にあるのはモホロヴィチッチ不連続面で，これは地殻とマントルの境界面である．

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