Many seismic profiles in South China have demonstrated that low-velocity layer generally exists in the middle crust.

华南沿海众多的地震测深剖面揭示出地壳不同深度上存在着壳内低速层。

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The crust is multilayered and there exists a low velocity layer in the lower crust.

地壳由多层介质组成，在下地壳中存在着低速层。

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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。

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