It shows that recent strong earthquakes are mostly controlled by active faults with NW strike in the North China block region.
结果还表明，华北地块现今强震活动主要受nw走向断裂的控制。
The North China Block is the distributive province of the important iron ore reserve, the main-iron-ore-mining region, and is also the important district of the iron and steel industry in China.
华北陆块是我国重要铁矿资源的分布区，铁矿石主要开采区，也是我国钢铁工业的重要分布区。
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