Abstract
Internal structure imaging of the Earth, along with determining basin structure, can aid in evaluating potential seismic hazards. However, the high operating cost limits the current geophysical exploration methods; moreover, it is difficult to apply these techniques over a large area, which limits our understanding of the Quaternary structure and the development of earthquake prevention science. A combination of dense array observation technology and ambient noise surface wave tomography is being rapidly developed as a high-resolution urban detection method. Here, we report the ambient noise imaging results of a high-density array experiment. In the ambient noise surface wave tomography method (e.g., surface wave tomography; Eikonal tomography), the signal is assumed to be a single mode. However, several multimode signals were detected in this dataset. With the use of traditional methods to measure the dispersion, mode confusion occurs and the extracted dispersion curve jumps. To solve this problem, by combining the advantages of phase-matched filtering and dispersion compensation, we realized the automatic pickup of fundamental group velocity using reference phase velocity. From this, a Rayleigh wave group velocity map was obtained. The regional average phase velocity information was included in the inversion steps to reduce the uncertainty in the inversion of shear wave velocity. Finally, an S-wave velocity structure model was obtained within a depth of 500 m. The velocity structure was roughly layered and grew with depth. In the depth range of 240–320 m, obvious decreases in the S-wave velocity were observed. Compared with geothermal drilling data, this was speculated to be the reflection of a water-rich (confined water) sand layer. This study provides a technical approach for and a processing example of a high-density array, and its velocity model can be used as a reference for urban subsurface structure, underground space utilization, and earthquake disaster prevention and control.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 91962110 and No. 42004081), Land Resource Survey Project of China Geological Survey (Grant No. DD20189629), and Basic Scientific Research Fund of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources (No. J1901-12). Several figures were made using Generic Mapping Tools (Wessel and Smith, 1998), And we thank two anonymous reviewers for their assistance in evaluating this paper.
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Wu, Q., Li, Q., Hu, X. et al. Ambient noise surface wave tomography of Quaternary structures derived from a high-density array in the central Hebei Depression, North China. Geosci J 27, 177–190 (2023). https://doi.org/10.1007/s12303-022-0033-y
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DOI: https://doi.org/10.1007/s12303-022-0033-y