利用噪声记录估计福建地区中上地壳体波速度结构
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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。
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.
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.
引文
陈祥熊、林树、李祖宁等,2005,福建—台网地区一维地壳速度结构的初始模型,地震,25(2),61～68。
范玉兰、林纪曾、胡瑞贺等,1990,华南地区近震走时表的研制,华南地震,10(2),1～16。
冯梅、安美建,2007,中国大陆中上地壳剪切波速结构,地震学报,29(4),337～347。
傅竹武、庄真、吕梓龄等,1993,由长周期地震面波研究华南地区地壳和上地幔三维结构,地震学报,15(2),159～167。
金星、李军、林树等,2007,利用双台脉动记录的相关系数估计福建地区瑞利面波的群速度,中国地震,23(4),349～358。
李军,2007,福建地区脉动资料的处理与分析[硕士论文],哈尔滨:中国地震局工程力学研究所。
李军、金星、周峥嵘等,2009,利用地震噪声准实时监测短周期面波波速变化,地震学报,31(6),629～640。
廖其林、王振明、王屏路等,1988,福州—泉州—汕头地区地壳结构的爆炸地震研究,地球物理学报,31(3),270～280。
邱陶兴、廖其林、王振明等,1991,福建沿海地区地壳S波速度结构和泊松比分布特征,华南地震,11(2),23～30。
宋仲和、安昌强、陈立华等,1986,中国大陆和边缘海的上地幔P波速度结构,地震学报,8(3),263～274。
朱露培、曾融生、刘福田,1990,京津唐张地区地壳上地幔三维P波速度结构,地球物理学报,33(3),267～277。
Dziewonski A,Bloch S,Landisman M,1969,A technique for analysis of transient seismic signals,Bull Seism Soc Amer,59(1),427～444.
Feng C C,Teng T L,1983,Three-dimensional crust and upper mantle structure of the Eurasian continent,J Geophys Res,88:2261～2271.
Herrmann R B,Ammon C J,2002,Computer programs in seismology-surface waves,receiver functions and crustal structure,http://www.eas.slu.edu/People/RBHerrmann/ComputerPrograms.html.
Sabra K G,Gerstoft P,Roux P,and Kuperman W A,2005,Extracting time-domain Green's function estimates from ambient seismicnoise,Geophys Res Lett,32,L03310.
范玉兰、林纪曾、胡瑞贺等,1990,华南地区近震走时表的研制,华南地震,10(2),1～16。
冯梅、安美建,2007,中国大陆中上地壳剪切波速结构,地震学报,29(4),337～347。
傅竹武、庄真、吕梓龄等,1993,由长周期地震面波研究华南地区地壳和上地幔三维结构,地震学报,15(2),159～167。
金星、李军、林树等,2007,利用双台脉动记录的相关系数估计福建地区瑞利面波的群速度,中国地震,23(4),349～358。
李军,2007,福建地区脉动资料的处理与分析[硕士论文],哈尔滨:中国地震局工程力学研究所。
李军、金星、周峥嵘等,2009,利用地震噪声准实时监测短周期面波波速变化,地震学报,31(6),629～640。
廖其林、王振明、王屏路等,1988,福州—泉州—汕头地区地壳结构的爆炸地震研究,地球物理学报,31(3),270～280。
邱陶兴、廖其林、王振明等,1991,福建沿海地区地壳S波速度结构和泊松比分布特征,华南地震,11(2),23～30。
宋仲和、安昌强、陈立华等,1986,中国大陆和边缘海的上地幔P波速度结构,地震学报,8(3),263～274。
朱露培、曾融生、刘福田,1990,京津唐张地区地壳上地幔三维P波速度结构,地球物理学报,33(3),267～277。
Dziewonski A,Bloch S,Landisman M,1969,A technique for analysis of transient seismic signals,Bull Seism Soc Amer,59(1),427～444.
Feng C C,Teng T L,1983,Three-dimensional crust and upper mantle structure of the Eurasian continent,J Geophys Res,88:2261～2271.
Herrmann R B,Ammon C J,2002,Computer programs in seismology-surface waves,receiver functions and crustal structure,http://www.eas.slu.edu/People/RBHerrmann/ComputerPrograms.html.
Sabra K G,Gerstoft P,Roux P,and Kuperman W A,2005,Extracting time-domain Green's function estimates from ambient seismicnoise,Geophys Res Lett,32,L03310.
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