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本文用单台多重滤波方法测定了经过青藏高原地区瑞利波群速度频散曲线。所得基阶瑞利波的观测周期为5.0—56.0秒,速度标准偏差为0.08—0.15公里/秒,一阶瑞利波的观测周期范围为10—16秒,速度标准偏差为0.05—0.13公里/秒。利用广义线性反演方法对频散曲线进行反演,可得出一个由五层构成的地震横波速度地壳模型。在27—40公里之间存在低速层,其横波速度为3.29公里/秒,比上一层低0.21公里/秒。
In this paper, a single multi-filter method was used to measure the velocity dispersion curve of Rayleigh wave group over the Qinghai-Tibet Plateau. The observed first-order Rayleigh wave observation period of 5.0-56.0 seconds, the standard deviation of 0.08-0.15 km / s, the first-order Rayleigh wave observation period range of 10-16 seconds, the standard deviation of 0.05-0.13 km / second. Using the generalized linear inversion method to invert the dispersion curve, a five-layer seismic shear-velocity crustal model can be obtained. Between 27 and 40 km there is a low velocity layer with a shear wave velocity of 3.29 km / s, which is 0.21 km / s lower than the previous one.