以新疆强震动台网获取的伽师6.4级地震的42组126条原始加速度记录为依据，对强震动记录时程、幅值、频谱三方面进行分析。结果表明，此次地震获取的最大加速度峰值为633.3cm/s²，仪器地震烈度为Ⅸ度；在震中距200km以内两水平向与垂直向加速度峰值比在1~3之间，速度峰值比在0~4之间。分析此次地震三分向加速度峰值衰减关系，0~50km范围内地震峰值加速度观测值在分区地震动衰减关系(Yu13)长轴预测值误差范围之内，高于南天山西段土层衰减关系(Zhang)预测值；水平向加速度反应谱卓越周期主要集中在0~0.5s，垂直向集中在0~0.2s。65XKR台水平向反应谱高于Ⅷ度罕遇地震设计反应谱，峰值卓越周期为0.48s；垂直向反应谱高于Ⅷ度罕遇地震设计反应谱，峰值位于高频段。

In this paper, we analyzed 42 three-component acceleration data from the M6.4 earthquake occurred on January 19, 2020 in Jiashi country, Xinjiang, to study the characteristic of the amplitude, duration and response spectrum of the strong motion records. The results show that the maximum peak of acceleration value is 633.3cm/s², and the seismic intensity of the instrument is Ⅸ degrees, the ratio of acceleration peak to vertical peak value is between 0 and 4, the peak value of acceleration of this earthquake is basically within the range of Yu13 long axis error of ground motion attenuation relationship, which is higher than Zhang's predicted value. The excellent period of horizontal acceleration response spectrum is mainly concentrated in 0~0.5 seconds, and the vertical direction is concentrated in 0~0.2 seconds, The horizontal response spectrum of 65XKR station is higher than Ⅷ degrees rare earthquake design response spectrum, the value is 0.48 seconds, the vertical response spectrum is higher than Ⅷ degrees rare earthquake design response spectrum, and the peak value is in the high frequency band.

P315

中国地震局星火计划(XH19051)、新疆地震局对外项目(300130201)共同资助