鄂尔多斯西缘地区地震动高频衰减特性初步研究

A Preliminary Study on the Attenuation Characteristics of High Frequency Ground Motionin the Western Margin of Ordos

以鄂尔多斯西缘地区(34°N—42°N,103°E—109°E)为研究对象,基于2007—2020年研究区域内14个强震动台站记录到的116条强震记录(1≤MS≤8),采用加速度反应谱法,通过MATLAB软件编程拟合鄂尔多斯西缘地区kappa值与震中距的线性回归关系。研究结果表明,鄂尔多斯西缘地区强震台站高频衰减参数kappa0值为0.01545~0.06560 s;等效剪切波速(VS20、VS30)与震中距存在对数关系;随着VS20、VS30的增大,kappa0值逐渐减至0。

The western margin of Ordos(N:34°—42°;E:103°—109°)as the research object,using 2007 to 2020,the research area of 14 strong motion stations recorded of the 116 strong earthquake events data(2≤MS≤8),using Anderson and Hough the classic algorithm,using MATLAB software programming to calculate the ordos west region,the linear relationship between the kappa value and the epicenter distance to calculate the ordos kappa0 earthquake stations in the western margin high frequency attenuation parameter value is between 0.01545 s to 0.06560 s.There is a logarithmic relationship between equivalent shear wave velocities(VS20,VS30)and epicenter distance.With the increase of VS20 and VS30,the kappa0 value gradually decreases to 0.