汶川地震； 映秀-北川断裂； 活动分段特征； 地震震级； 强震复发周期；
Wenchuan earthquake; Yingxiu-Beichuan fault; activity segmentation; assessment of earthquake magnitude; recurrence interval of strong earthquake;
它的发育、展布、组合结构等特征都与先存的南北向断裂紧密相关，并表现出明显的分段活动特性。
Its characteristics about fault development, fault distribution and fault compound structure are correlate with meridional fault existed early and show a sectional activity.
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