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利用新疆数字地震台网记录的15个台站的720条地震波形资料,用Atkinson方法联合反演得到南天山西段Q值随频率f的关系式为Q(f)=313.4f0.548;在400 km的震源距范围内,研究区地震波的几何衰减满足三段衰减模型;研究区的Q值小于天山中东段、北天山和柯坪地区的Q值,说明该区域构造活动强烈。其次根据S波衰减记录得到观测振幅谱,采用Moya遗传算法得到了新疆南天山西段15个台站的场地响应。结果显示,大多数台站的场地响应在1附近,西克尔台(XKR)、塔什库尔干台(TAG)、乌什台(WUS)和神木园台(SMY)的场地响应在1~4 Hz之间均大于2,表现出一定的放大效应,岳普湖台(YPH)呈现余弦波动,可能与台基岩性和仪器的工作状态有关。区域的选择对台站场地相应计算结果影响不大。
Using 720 seismic waveforms from 15 stations recorded by Xinjiang Digital Seismic Network, the Q value of the western part of southern Tianshan Mountains with frequency f is derived by Atkinson’s method. Q (f) = 313.4f0.548. At 400 km. The geometric attenuation of the seismic wave in the study area satisfies the three-stage attenuation model. The Q value of the study area is smaller than the Q value of the middle Tianshan, North Tianshan and Keping areas, indicating a strong tectonic activity in the area. Secondly, observing the observed amplitude spectrum according to the S-wave attenuation record, the site response of 15 stations in the western part of southern Tianshan Mountains was obtained by Moya genetic algorithm. The results showed that the response of most of the stations was near 1, and the response of XKR, TAG, WUS and SMY stations was at 1 ~ 4 Hz Which are both larger than 2, showing a certain amplification effect. The YPH has a cosine fluctuation, which may be related to bedrock lithology and the working status of the instrument. The choice of area has little effect on the calculation results of station site.