low velocity zone

review on studies of ultra low velocity zone

超低速区研究进展与展望

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。

The geothermal anomaly, low velocity zone and high conductivity layer in crust, and frequent occurrence of strong earthquakes show that the study area is an active area of modern tectonization.

地热异常、地壳内存在低速层和高导层、强烈地震频繁发生等现象说明，这一地区是现代构造运动的活动区。

The tomographic result shows that there is a P wave low velocity zone ( LVZ) in the upper crust beneath the Tengchong volcanic area. The LVZ is in the depth of 7~ 8 km and may be a small magma chamber or a partial melting body.

层析成像结果显示出，在腾冲火山区下方的上地壳内存在明显的P波低速区，该低速区在地下7～8km深度，可能与上地壳内的岩浆囊或部分熔融体有关。

a low velocity zone exists at the middle of the passages near the suction side of the blade.

小流量工况始终存在一个低速区，位于叶槽进出口之间，靠近吸力侧。