南海西缘断裂带的主断裂是一条形成于中生代的基底断裂，在新生代持续活动扩展为右行走滑活动断裂带。

The main fracture of the western margin fault zone of the South China Sea is originated from the Mesozoic basement fault, continuously developed into dextral strike-slip fault zone in Cenozoic.

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中新世以来，双河组（N1s）地层的褶皱走向为NE向，此期间盆缘主断裂变为左旋逆推性质；

Since the Miocene, the fold in the Shuanghe group (N1s) stroke in NE when the main fault on the basin rim changed into sinistral thrust.

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在上翼缘处有足够的松动，因而在主梁腹板上并不会引起很大的相对扭转。

At the top flange there would be enough slack so that no relative twist of any significant magnitude would be introduced into the girder web.

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