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利用噪声记录估计福建地区中上地壳体波速度结构
李军,金星,鲍挺,林树,韦永祥,张红才
作者单位
李军 福建省地震局 
金星 福建省地震局; 中国地震局工程力学研究所; 福州大学; 
鲍挺 福建省地震局 
林树 福建省地震局 
韦永祥 福建省地震局 
张红才 福建省地震局 
摘要:
本文利用福建地震台网25个宽频带台站的噪声记录提取瑞利波和勒夫波频散曲线反演地壳波速结构,并利用爆破观测结果对该速度模型进行检验。结果表明:利用该方法得到的地壳波速结构在浅部分辨率较好,深部波速结构的反演结果精度较低,这主要是由于本文所选台站间距较小,提取得到的面波频散曲线在短周期部分精度较高,而长周期部分面波频散曲线的偏差较大。综合噪声反演结果与传统反演结果,本文最终给出了一个新的速度模型,利用该模型计算得到的理论走时与爆破观测走时具有很好的一致性。
关键词:  噪声  格林函数  频散曲线  波速结构
DOI:
分类号:
基金项目:地震行业科研专项经费(200808067); 地震科技星火计划(XH1016Y)联合资助
The wave velocity structure of upper shell in Fujian estimated by the noise records
Li Jun1),Jin Xing1,2,3),Bao Ting1),Lin Shu1),Wei Yongxiang1),Zhang Hongcai1)
Abstract:
The dispersion curves of Rayleigh wave and Love wave were extracted from the seismic noise of 25 broad-band stations recorded by the Fujian Seismic Network, and inverted for the lithosphere wave structure. Furthermore, the velocity model was inspected by the blast observation outcome. The results indicate that the resolution of the lithosphere wave structure obtained by this method is good in the shallow part, but in the depth part the inverted result of the wave structure has low precision. It is mainly caused by the small inter-station distance chosen in the paper. So the wave dispersion curves have high precision in short-period part, but the warp of the wave dispersion curve in long-period part is big. Considering both the results of the noisy invert and the traditional invert, we finally present a new velocity model in which the theory calculated runtime can well match the blast observation runtime.
Key words:  Noise Green-function Dispersion-curve Velocity-structure