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1981年8月13日内蒙古的丰镇县发生5.8(Ms)级地震.该震发生在口泉断裂带与阴山东西向构造的复合部位,主要受口泉断裂活动控制,又受纬向构造阻隔应力作用的影响.震区是断裂交汇处应力易于积累释放的地区.Ⅵ度区平面长轴呈N20°E展布,与口泉断裂带走向基本吻合.震前,在山西北部地区早已开展流动地磁工作.80年5月的测量中出现异常,到81年8月发震,异常随时空间的展布呈一定规律性,我们认为这是震磁效应的反映.
An earthquake of magnitude 5.8 (Ms) occurred in Fengzhen County, Inner Mongolia on August 13, 1981. The quake occurred in the composite part of the Yanshan fault zone and the Yinshan east-west structure, and was mainly controlled by the mouth spring fault activity and was also blocked by the latitudinal structure Stress zone.The earthquake zone is the area where the stress is easy to accumulate and release at the fault juncture.The long axis of the VI degree plane shows a distribution of N20 ° E which basically agrees with that of the mouth spring.The flow in the northern part of Shanxi Geomagnetic work in May 1980 measured anomalies in August 81 earthquake occurred in August, the distribution of anomalies in time and space showed a certain regularity, which we think this is a reflection of the seismic effect.