大青山山前断裂乌素图–奎素段对呼和浩特市37个街道地震烈度评估

Seismic Intensity Assessment of 37 Subdistricts in Hohhot City Affected by the Wusutu-Kuishu Section of the Daqingshan Mountain Front Fault

摘要: 以大青山山前断裂乌素图–奎素段为例，具体地评估了呼和浩特市37个街道的地震烈度。首先基于该断裂的空间分布特征和地震发生源的不确定性选取最远震中与最近震中假设点，其次采用平面坐标法，计算37个街道最远震中距与最近震中距。最后采用华北地区震级M与破裂长度L经验公式与地震烈度衰减模型，计算该断裂未来可能发生的最大震级，并评估37个对象点的地震烈度。研究结果表明，大青山山前断裂乌素图–奎素段未来可能发生的最大地震为7.2；最远震中时，有86.5%的街道处于烈度VIII，13.5%的街道处于烈度IX；最近震中时，有10.8%的街道处于烈度VIII，89.2%的街道处于烈度IX。

Abstract: Taking the Wusutu-Kuishu section of the Daqingshan Mountain Front Fault as an example, this study specifically assessed the seismic intensities of 37 subdistricts in Hohhot City. Firstly, based on the spatial distribution characteristics of the fault and the uncertainty of the earthquake source, the farthest epicenter and closest epicenter hypothesis points are selected. Secondly, the plane coordinate method is used to calculate the farthest epicenter distance and closest epicenter distance of 37 streets. Finally, using the empirical formula of magnitude M and rupture length L in the North China region and the seismic intensity attenuation model, the maximum magnitude that may occur in the future of the fault is calculated, and the seismic intensity of 37 object points is evaluated. The research results indicate that the maximum earthquake that may occur in the future in the Wusutu Kuishu section of the Daqingshan piedmont fault is 7.2; At the farthest epicenter, 86.5% of the streets were at intensity VIII, and 13.5% of the streets were at intensity IX; At the recent epicenter, 10.8% of the streets were at intensity VIII and 89.2% were at intensity IX.