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本文对1981年道孚6.9级地震的地面形变进行了分析。结果表明:震中区并未发生明显的、前兆性的连续形变,前兆信息在震中外围,以非连续形变——破裂面蠕动的方式表现出来,呈中、短期前兆蠕动图象。 震时形变表明,这次地震是鲜水河断裂上又一次继承性的水平剪切破裂活动。它与道孚宽谷盆地有成因上的联系。
In this paper, the ground deformation of the Dulm 6.9 earthquake in 1981 was analyzed. The results show that there is no obvious precursory continuous deformation in the epicenter area. The precursory information appears on the periphery of the epicenter in the form of discontinuous deformation-fracture surface creep. It shows medium- and short-term precursory creep images. Deformation during the earthquake indicates that the earthquake was another succession of horizontal shear fracture on the Xianshuihe fault. It is genetically linked to the Daofu Valley basin.