辽宁及邻区背景噪声面波群速度结构研究

Abstract

Abstract: In this paper, by collecting continuous background noise waveform vertical data recording of 59 broadband seismic stations in Liaoning and its adjacent areas from January 2012 to December 2012,we got the surface wave group velocity images through ambient noise tomography in the study area. We calculated the inter-station Green fuction and extracted the Rayleigh wave group velocity dispersion curves using CPS330. According to quality control and screening, we picked high SNR 1233 group velocity dispersion curves of Rayleigh wave from 1655 dispersion curves, then the study area was divided into a grid of 0.5°×0.5° degree grid by adopting Ditmar &Yanovskaya method and obtained the Raileigh wave group velocity maps at periods 8~40 s in our study. The results show that crust and upper mantle structures of Liaoning region present obvious lateral inhomogeneity. Group velocity distribution at short period is quite well in agreement with known geological and tectonic features in this study area. At the 8~15 s period, the group velocity distribution characteristics have good correspondence with basin and mountain uplift, the characteristic of velocity distribution is the “two horst higher, one graben lower”, and the result mainly coincides with the geological structure. The lower group velocity abnormal appears in the Bohai Bay and Liaodong Bay at periods 20~30 s. This phenomenon mainly reflect that it have existed a thick sedimentary layer in the Bohai Bay Basin and Liaohe basin. For the group velocity maps at longer periods 35~40 s, which are related to the depth of Moho, the distribution characteristics of the depth is that the western is thicker than eastern in the study region. The results illustrate the geological structure and physiognomic characteristics, and also have identical views with correlational studies. In the meanwhile, it also will supply us important useful references to the tectonic background of seismic activity and seismogenic mechanism in Liaoning and its adjacent areas.

Key words: Ambient noise tomography, Group velocity, Cross correlation, Liaoning and its adjacent areas

CLC Number:

P315.7

FENG Ce, JIAO Ming-ruo, SHEN Jun. Surface Wave Group Velocity Structure of Liaoning and its Adjacent Areas based on Ambient Noise Tomography[J]. EARTHQUAKE, 2018, 38(1): 84-95.

References

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Surface Wave Group Velocity Structure of Liaoning and its Adjacent Areas based on Ambient Noise Tomography

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