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| 云南地区背景噪声互相关函数中体波信号来源初探 | |
| 引用本文： | 王伟涛,杨润海,郑定昌,倪四道,王宝善.云南地区背景噪声互相关函数中体波信号来源初探[J].地震研究,2011,34(3). |
| 作者姓名： | 王伟涛 杨润海 郑定昌 倪四道 王宝善 |
| 作者单位： | 1. 中国地震局地球物理研究所,北京,100081 2. 云南省地震局,云南昆明,650224 3. 中国科学院测量与地球物理研究所动力测量重点实验室,湖北武汉,430077 |
| 基金项目： | 中国地震局地球物理研究所基本科研专项(DQJB10A01,DQJB10B20,DQJB11C05); 国家自然科学基金(41004019,40874095)联合资助 |
| 摘 要： | 利用云南地区43个宽频带地震台站记录的2008～2010年垂直分量数据,计算了台站对间的互相关函数并得到了5～40 s周期的瑞利面波信号。研究发现在5～10 s周期范围内,瑞利面波信号之前存在很强的前驱信号,该信号能量优势频段为0.1～0.2 Hz,其到时接近噪声互相关函数零点,视速度约为30 km/s。该信号到时随季节存在正负交替变化,进一步的质点分析表明该信号为出射角较小的P波信号。参考已有的研究,认为远场地脉动噪声源中的P波信号穿过地球深部到达云南地区,形成了噪声互相关函数中视速度较高的体波信号,并且相关的噪声源位置在冬季和夏季分别位于北太平洋和南印度洋,具有明显的季节性空间变化。 |
| 关 键 词： | 背景噪声 体波信号 噪声源 季节变化 |
Study on the Origin of the Body Wave Extracted from Ambient Seismic Noise Cross-correlation Function in Yunan |
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| WANG Wei-tao,YANG Run-hai,ZHENG Ding-chang,NI Si-dao,WANG Bao-shan.Study on the Origin of the Body Wave Extracted from Ambient Seismic Noise Cross-correlation Function in Yunan[J].Journal of Seismological Research,2011,34(3). | |
| Authors: | WANG Wei-tao YANG Run-hai ZHENG Ding-chang NI Si-dao WANG Bao-shan |
| Institution: | WANG Wei-tao1,YANG Run-hai2,ZHENG Ding-chang2,NI Si-dao3,WANG Bao-shan1(1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)(2.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)(3.Key Laboratory of Dynamic Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,Hubei,China) |
| Abstract: | Using vertical component records observed at 43 broad-band seismic stations from 2008 to 2010 in Yunnan,we calculate the noise-cross correlation functions between each station-pair and obtain Raleigh surface wave in the period from 5s to 40s.We find that in the period from 5s to 10s,and before Rayleigh wave,there is a strong precursory wave whose dominant frequency band is between 0.1 Hz and 0.2 Hz and whose arrival time is near the zero of cross correlation functions.Moreover its negative arrival-time in W... |
| Keywords: | ambient noise body wave signal noise source seasonal variation |
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