Oil and gas are mainly distributed in the fault-fold and slope zones.

其油气主要分布在断褶和斜坡带中。

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The structural model should be built in 4 steps with the axial surface analysis as the basis, the fault-fold geometric analysis as the key, the balanced idea as the guidance and the stru.

主要遵循4个基本步骤，轴面分析是基础，断层褶皱形态分析是核心，平衡观念是灵魂，构造复原是手段。

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Key points: classification of fault and fold.

重点：褶皱和断层的分类。

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But on that fateful Friday, when the North American plate slid over the Pacific plate along a subduction zone running 130km (80 miles) off the Pacific coast of northern Japan, the shock leapt from the first segment to a second and on to a third, extending the fault zone some 400km and increasing its intensity more than 30-fold.

ECONOMIST: The myth and reality of the Japanese earthquake