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新疆地震台网对新疆呼图壁大容量气枪震源信号的接收能力及其影响因素分析
苏金波1) 王琼1) 王海涛1) 史勇军1) 陈向军1) 冯磊1) 陈昊2) 张文秀1)
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)中国地震局兰州地震研究所,兰州 730000
摘要:
利用新疆地震台网资料和功率谱密度法,以台站噪声的功率谱密度中值曲线作为评估台站噪声水平的依据,对6个台站的噪声水平进行了评估。对比不同台站的功率谱密度和气枪震源信号的识别情况发现,通过2000次叠加,可以识别气枪震源信号的台站的噪声水平均低于无法识别气枪震源的台站,噪声功率谱密度最大差值为40dB,最小差值15dB。最后通过对噪声水平的评估,判断部分台站无法识别气枪震源信号的主要原因是台站噪声水平较高造成的。
关键词:  大容量气枪  概率密度函数法  噪声水平  信号识别
DOI:
分类号:
基金项目:
Research on Large Volume Airgun Source Signal Reception in Hutubi, Xinjiang Using Seismic Network Data
Su Jinbo1) , Wang Qiong1) , Wang Haitao1) , Shi Yongjun1) , Feng Lei1) , Chen Xiangjun1) , Chen Hao2) , and Zhang Wenxiu1)
1) Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China;2) Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China
Abstract:
We used data from the Xinjiang Digital Seismic Network and PSD ( power spectral density) method to perform noise level assessment for six stations. We calculated the median of the power spectral density to evaluate the noise level of different stations. After the comparison of the power spectral density of different stations and the airgun signal recognition, we found that noise level of stations with recognizable airgun source signals is lower than that of stations without recognizable signals. The largest difference of the power spectral density is 40dB, and the smallest is 15dB. Finally, we found that the failure to recognize the signal of airgun sources at some stations is due to the noise level.
Key words:  Large volume airgun  Power spectral density  Noise level  Signal recognition