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南天山西段地震尾波Q值研究
尼鲁帕尔·买买吐孙1, 夏爱国1, 海仁妮莎2
1.新疆维吾尔自治区地震局, 乌鲁木齐市新市区科学二街338号 830011;2.新疆维吾尔自治区地震局喀什基准地震台, 新疆喀什 844000
摘要:
基于新疆地震台网的数字地震波形资料,采用Aki的地震尾波单次散射模型,选取了南天山西段10个台站周围60km范围内MS≥2.0的397次地震事件计算并得到了不同台站的尾波Qc值。结果显示,南天山西段尾波Q0值平均值在140~390之间,其中喀什台和乌恰台Q0值最低;频率相关系数η的平均值在0.62~1.00之间,拟合平均Q值与对应频率之间的关系结果为Q=261.2±110.8f0.80±0.28,表明该地区是以低Q0η值为特征的构造活跃区。
关键词:  南天山西段  地震  尾波Q  单次散射
DOI:
分类号:P315
基金项目:新疆地震科学基金课题(201602)资助
The study on seismic coda Q value in the western segment of south Tianshan
Nilupaer Maimaitusun1, Xia Aiguo1, Hairennisha2
1.Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China;2.Kashgar Seismic Station of Earthquake Administration of Xinjiang Uygur Autonomous Region, Kashgar 844000, Xinjiang, China
Abstract:
The coda attenuations below 10 seismic stations in the southern Tianshan region were studied in this paper by using the earthquake waveform data recorded through the Xinjiang Digital Seismic Network. 397 earthquakes with MS ≥ 2.0 with the epicentral less than 60km around studied stations were used. The result showed that the average coda Q0 value of the southern Tianshan region is about 190~390 among which Kashgar and Wuqia have the lowest value. The correlation coefficient of mean frequency η is about 0.62~1.00. The relationship between the scattering attenuation and the frequency in the southern Tianshan region can be expressed as Q=261.2±110.8f0.80±0.28,suggesting that studied region is a tectonic active zone characterized with low Q0 and high η values.
Key words:  Southern Tianshan region  Earthquake  Coda Q value  Single scattering model