A Preliminary Study on the Attenuation Characteristics of High Frequency Ground Motionin the Western Margin of Ordos
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摘要: 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。Abstract: 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.
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Key words:
- Western margin of Erdos region /
- Ground motion /
- High Frequency attenuation /
- Kappa /
- Epicentraldistance
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图 1 台站分布及地质构造
Figure 1. The distribution of seismograph station and geologic structure
图 2 Anderson等（1984）经典计算方法计算的kappa值
Figure 2. Anderson&Hough's the classical method calculates k
图 3 鄂尔多斯西缘地区14个台站kappa值与震中距拟合关系
Figure 3. The fitting relationship between kappa and epicentral distance of 14 stations in the western margin of Erdos region
图 5 震级与峰值加速度PGA关系分布图
Figure 5. Distribution of earthquake magnitude and PGA(peak acceleration value）
图 6 巴彦木仁、磴口台站kappa值与震中距拟合关系
Figure 6. Fitting relationship between kappa and epicenter distance at Banyanmuren and Dengkou station
图 7 kappa0值与剪切波速VS20、VS30拟合关系曲线
Figure 7. The fitting relationship between kappa0 and shear-wave（VS20、VS30）velocity
表 1 研究区域地震台站信息
Table 1. The research area seismic station information
序号 台站名称 经度 纬度 记录器型号 场地类型 1 巴彦浩特 105.7°E 38.8°N ETNA 土层 2 巴彦木仁 106.7°E 39.9°N ETNA 土层 3 宝丰 106.3°E 39.0°N MR-2002 土层 4 磴口 106.9°E 40.3°N ETNA 土层 5 干盐池 105.3°E 36.6°N MR-2002 土层 6 公地 106.8°E 40.6°N ETNA 土层 7 吉兰泰 105.7°E 39.7°N ETNA 土层 8 临河 107.6°E 40.8°N ETNA 土层 9 灵武 106.3°E 38.1°N MR-2002 土层 10 前进农场 106.4°E 38.8°N MR-2002 土层 11 青铜峡 106.0°E 38.0°N MR-2002 基岩 12 沙海 106.9°E 40.9°N ETNA 土层 13 乌海 106.8°E 39.4°N ETNA 土层 14 西吉 105.4°E 35.5°N MR-2002 土层 
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表 2 kappa值与震中距拟合结果
Table 2. The relationship between kappa and epicentral distance
台站名称 方向 回归方程 K0/s 拟合优度值/R2 $ {{\bar{{K}}}_{\rm{0}}}$/s VS20/m·s−1 VS30/m·s−1 巴彦浩特 N-S kappa=0.000 3R+0.0264 0.0264 0.9803 0.02530 343.05 370.2 E-W kappa=0.000 3R+0.0242 0.0242 0.9854 巴彦木仁 N-S kappa=0.000 2R+0.0363 0.0363 0.8691 0.03485 353.4 389.4 E-W kappa=0.000 2R+0.0334 0.0334 0.9280 宝丰 N-S kappa=0.000 1R+0.0687 0.0687 0.6055 0.06560 180.4 222.1 E-W kappa=0.000 1R+0.0625 0.0625 0.7876 磴口 N-S kappa=0.000 1R+0.0605 0.0605 0.8971 0.05845 231.7 261.7 E-W kappa=0.000 1R+0.0564 0.0564 0.9425 干盐池 N-S kappa=0.000 1R+0.0531 0.0531 0.7542 0.05245 317.4 357.3 E-W kappa=0.000 1R+0.0518 0.0518 0.7194 公地 N-S kappa=0.000 2R+0.0541 0.0541 0.9790 0.05450 222.7 251.2 E-W kappa=0.000 2R+0.0549 0.0549 0.9730 吉兰泰 N-S kappa=0.000 2R+0.0526 0.0526 0.8812 0.05525 327.7 335.8 E-W kappa=0.000 2R+0.0579 0.0579 0.7826 临河 N-S kappa=0.000 1R+0.0530 0.0530 0.9977 0.05175 232.3 249.7 E-W kappa=0.000 1R+0.0505 0.0505 0.9960 灵武 N-S kappa=0.000 3R+0.0449 0.0449 0.9996 0.04415 292.6 325.1 E-W kappa=0.000 3R+0.0434 0.0434 0.9957 前进农场 N-S kappa=0.000 3R+0.0637 0.0637 0.7536 0.06555 209.5 248.9 E-W kappa=0.000 3R+0.0674 0.0674 0.6815 青铜峡 N-S kappa=0.000 1R+0.0428 0.0428 0.4987 0.04315 219.0 260.0 E-W kappa=0.000 1R+0.0435 0.0435 0.6287 沙海 N-S kappa=0.000 2R+0.0489 0.0489 0.9743 0.04870 188.3 216.5 E-W kappa=0.000 2R+0.0485 0.0485 0.9710 乌海 N-S kappa=0.000 5R+0.0155 0.0155 0.7320 0.01545 352.7 390.5 E-W kappa=0.000 5R+0.0154 0.0154 0.6702 西吉 N-S kappa=0.000 1R+0.0429 0.0429 0.4713 0.04240 195.1 228.7 E-W kappa=0.000 1R+0.0419 0.0419 0.4909
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表 3 巴彦木仁、磴口台站kappa值与震中距拟合结果
Table 3. Fitting results of kappa value and epicenter distance at Bayanmuren and Dengkou station
台站名称 方向 回归方程 K0/s 拟合优度值/R2 巴彦木仁 N-S kappa=0.000 3R+0.0275 0.0275 0.6186 E-W kappa=0.000 3R+0.0266 0.0266 0.7081 磴口 NS kappa=0.000 1R+0.0650 0.0650 0.2447 EW kappa=0.000 1R+0.0562 0.0562 0.6064
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