【摘要】 玉农希断裂呈N2 0°～ 30°E方向展布于四川省西部高原 ,构成贡嘎山第四纪强烈隆起断块的西边界。在北西西 -近东西向的区域主压应力作用下 ,玉农希断裂第四纪以来主要表现为挤压逆冲性质。断错地貌研究结果表明 ,该断裂为一条全新世弱活动断裂 ,平均垂直滑动速率为 0 5～ 0 6mm /a左右。 1975年 1月 15日康定六巴 6 2级地震发生于该断裂上 ,宏观震中位置位于六巴乡溯布 -莫达村附近 ,极震区长轴方向与玉农希断裂走向一致 ,是该断裂最新活动的表现。更多还原

【Abstract】 Distributing the west plateau of Sichuan Province along the direction of N20°～30°E,Yunongxi fault constitutes the west boundary of Gongga Mt.strong rise block in Quaternary.Under the effect of the compressive stress field with NWW\|EW direction,Yunongxi fault mainly show the character of compressive and reverse motion since Quaternary.The results of rupture landform investigation indicate that this fault is one of weak active faults in Holocene,its average vertical slip rate is 0 5～0 6 mm/a.On Jun.15,1975,Liuba M6 2 earthquake in Kangding occurred on the fault.The macro\|epicenter located at Shuobu\|Moda,Liuba county.The direction of long axis of meizoseismal area is same as that of Yunongxi fault trend.The occurrence of the earthquake is resulted from the newest activity of the fault.更多还原