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史载公元849年10月20日,内蒙古河套地区发生大地震.对这次地震的震中位置、震级、烈度的认识目前存在较大分歧.作者在大青山山前断裂带活断层填图和古地震研究过程中,在大青山山前断裂中、西段,发现多处距今1000多年的地震形变遗迹;结合公元849年地震史料的进一步考证,表明大青山山前断裂带为公元849年地震的发震构造.宏观震中位置应在活动断裂变位量最大的包头铝厂至永富一带,地理坐标约为北纬40.4°,东经110.2°.震中烈度为Ⅹ度,震级为7.7.
History records Great earthquake occurred in Hetao area of Inner Mongolia on October 20, 849. There is a great divergence of understanding about the epicenter location, magnitude and intensity of the earthquake at present. In the process of earthquake research, many deformational sites of more than 1,000 years have been found in the middle and upper part of the Daqingshan piedmont fault. Based on the historical data of the 849 AD, further investigation shows that the Daqingshan piedmont fault zone was an 849 Earthquake The epicenter of the epicenter should be located in the area of Baotou Aluminum Plant with the largest displacement of active faults to Yongfu with the geographical coordinates of about 40.4 ° N and 110.2 ° E.The epicenter intensity is Ⅹ degree and the magnitude is 7.7.