The asthenosphere corresponds approximately to the low - velocity zone.

软流圈，大体上相当于低速带。

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The lowermost mantle layer is above the core mantle boundary (CMB) and composed of D" region and ultra-low velocity zone (ULVZ)."

地幔底层由具有高地震波速和高密度的D″区和超低速带（ULVZ）组成。

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The horizontal low velocity layer, the vertical low velocity zone and the high velocity layer in the basement of the lower crust are related to the ore_forming processes.

文中还探讨了中国大陆主要成矿域岩石圈的现今活动性，以及地壳厚度、壳内低速层、“墙式”地震剪切波垂向低速带和下地壳底部高速层（体）的分布特征以及与成矿作用的关系。

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Last year, scientists using a technique called helioseismology, probed the Sun's interior, revealing that currents of gas at the base of the convective zone change velocity every 16 months.

BBC: Sun, Trace

While this is a pretty wide zone, considering the velocity of the move up, it could take all 30 pips to slow it down.

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