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新疆呼图壁人工水体大容量气枪信号发射台性能研究
魏斌1) 苏金波1) 王海涛1) 郑黎明1) 王琼1) 张文来1) 袁顺1) 魏芸芸1) 陈昊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)中国地震局兰州地震研究所,兰州 730000
摘要:
介绍了新疆呼图壁人工水体大容量气枪震源地震信号发射台的选址、建设过程及震源信号特征。从地质构造、历史地震的角度分析了地震信号发射台选址的合理性、必要性以及气枪激发池设计的合理性。利用激发池岸边的低灵敏地震仪记录到的气枪信号,阐述了气枪震源的高度重复性和人工水体气枪震源信号的稳定性,并对信号进行时频分析后得出,气枪信号的优势频率为2~6Hz。最后通过叠加的方法提高信噪比,得到呼图壁气枪震源信号的传播距离约为380km。
关键词:  气枪震源 选址 相关系数 频率特征
DOI:
分类号:
基金项目:中国地震局公益性行业科研专项(201508008)、国家自然科学基金(41474051)、新疆维吾尔自治区科研机构创新发展基金(201316)共同资助
Site selection and construction of Hutubi airgun source signal transmitting seismic station and its characteristic of source
Wei Bin1) Su Jinbo1) Wang Haitao1) Zheng Liming1) Wang Qiong1) Zhang Wenlai1) Yuan Shun1) Wei Yunyun1) Chen Hao2)
1)Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China;2)Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China
Abstract:
The site selection and construction of Hutubi,Xinjiang air-gun source signal transmitting seismic station and its characteristic of source are elaborated. The rationality and necessity of the signal transmitting station location are analyzed from the view of geological structure and historical earthquake. The rationality of pool design is also analyzed on the basis to the air-gun experimental requirements. The air-gun signal recorded by the instrument beside the pool proves that air-gun source is highly reproducible. The signal time-frequency analysis proves that the dominant frequency of the air-gun is 2-6Hz. Finally,the SNR(signal to noise ratio)from superposition shows the propagation distance of Hutubi air-gun is about 380km. This study shows that the Hutubi large volume air-gun source is green,environmentally friendly and efficient and is very suitable for detecting the underground structure and monitoring the changes of the underground medium in regional scale.
Key words:  Air­gun source  Site selection  Correlation coefficient  Frequency characteristic