基于背景噪声初步研究河北及邻区的剪切波速度结构

Abstract

Abstract: We present the surface wave dispersion results of the application of the ambient noise method to broad-band data recorded at 83 stations from digital seismic networks of the Hebei and surrounding areas. Firstly we used the multiple-filter analysis method to extract surface wave group velocity dispersion curves from inter-station paths at periods from 5 to 50 s. Then using linear inversion method to obtain shear wave velocity distribution. The results of group and shear wave velocity distribution maps generally demonstrate good correlations with surface geological and tectonic features. The results of the group velocity tomography show that at short periods (8~20 s), basin areas are clearly resolved with low group velocity due to its thick sedimentary layer, and the uplift areas show relative higher group velocity distribution. With the increase of period (>20 s) the group velocity distribution changed, and velocity gap between the basin and uplift areas had reduced after the 30 s period, due to the thickness of the Earth's crust, and beneath the middle-lower the shear wave velocity increase with depth. Our results alsoshow that in this study the dominated noise sources come from the north-west.

Key words: Surface wave, Group velocity dispersion, Velocity structure, Noise source

CLC Number:

P315.7

LIU Li, GONG Meng, HU Bing, ZENG Zhi-fang, LUO Yan. Preliminary Study of Shear Wave Velocity Structure of Hebei and Surrounding Areas from Ambient Seismic Noise[J]. EARTHQUAKE, 2012, 32(4): 103-112.

References

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Preliminary Study of Shear Wave Velocity Structure of Hebei and Surrounding Areas from Ambient Seismic Noise

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