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从背景噪声提取瑞利面波频散曲线——方法与应用实例
李玲利1,4) 王伟涛2) 朱良保3) 陈浩朋2) 王清东2) 缪鹏1) 王俊1)
1) 安徽省地震局,安徽合肥230031 ;2) 中国地震局地球物理研究所,北京100081 ;3) 武汉大学测绘学院,湖北武汉430079 ;4) 蒙城地球物理国家野外科学观测研究站, 安徽蒙城233500
摘要:
利用地震背景噪声提取台站间的面波频散信息,进而进行地下结构研究是目前地球物理学的研究热点之一.本文详细介绍了该方法的发展历程,并以流动台阵和固定地震台站数据为例给出了较为详细的噪声数据处理过程,重点阐述了如何利用地震背景噪声提取瑞利面波的频散曲线.此外,对基层科研人员如何更好地应用固定台站数据资料的技术细节问题给出了具体解决方案.
关键词:  背景噪声  互相关  瑞利面波 频散曲线
DOI:
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基金项目:
Processing Seismic Ambient Noise Data to Obtain Reliable Surface Wave Dispersion Measurements
Li Lingli1,4 ),Wang Weitao2 ),Zhu Liangbao3 ),Chen Haopeng2 ),Wang Qingdong2 ),Miao Peng1 ) and Wang Jun1 )
1) Earthquake Administration of Anhui Province,Hefei 230031,China ; 2) Institute of Geophysics,CEA,Beijing 100081,China ; 3) Department of Geophysics,School of Geodesy and Geometrics,Wuhan University,Wuhan 430079,China ; 4) Mengcheng National Geophysical Observatory,Mengcheng 233500,Anhui,China
Abstract:
Ambient noise tomography is a rapidly emerging field of seismological research. This paper presents the current status of ambient noise data processing and its development history over the past several years,with the intention to explain and justify this development through salient examples. The ambient noise data processing procedure can be divided into four principal phases: ① single station data preparation; ② crosscorrelation and temporal stacking; ③ measurements of dispersion curves (performed with frequency-time analysis for both group and phase speeds); ④ quality control,including SNR analysis and selection of the acceptable measurements. In addition,we provide a specific solution for a better use of the seismic station data to ambient noise study.
Key words:  Seismic ambient noise  Cross-correlation  Rayleigh surface wave  Dispersion curves