利用2008年10月5日新疆乌恰6.8级地震时新疆强震动观测台记录的S波资料和脉动观测资料,采用Nakamura方法计算了这些强震观测台的场地响应.结果表明:(1)地震记录前10 s的脉动场地响应明显大于测试脉动和地震记录S波的场地响应,是测试脉动和记录S波场地响应的3倍,而测试脉动场地响应和S波记录场地响应基本相符.(2)当记录台站的等效剪切波速小于250 m/s时,测试脉动场地响应值在2.5 ～5.0之间；当等效剪切波速大于250 m/s时,测试脉动场地响应值在1.5～3.0之间.(3)当记录台站覆盖层为同一种类型时,台站测试脉动场地响应小于1.%Selecting the records of the seismic microtremor before the MS6. 8 Wuqia earthquake on October 5, 2008 and the S-wave data of the earthquake recorded by Xinjiang Strong Motion Network, we calculate the response of the strong-motion at these 26 stations through the Nakamura's technique. The results are as the following: (1) Ten seconds before the P-wave, the site amplification effects of the Earth pulse are 3 times of the effects of S-wave and the effects of the testing pulsation. Meanwhile, the site amplification effects of S-wave are con-stsitent with the ones of the testing pulsa. (2) When the equivalent shear-wave velocity of the recording stations is lower than 250 m/s, the site-response value of the test pulsation will be between 2. 5 and 5. 0. When the e-quivalent shear-wave velocity of the recording stations is higher than 250 m/s, the site-response value of the testing pulsation will be between 1. 5 and 3. 0. (3) When the overlayers under the recording station are of the same type, the site response value of the test pulsation will be lower than 1.
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