Improving the inversion accuracy of shallow shear wave velocity structure based on microtremor method: A case study of Haikou Jiangdong New District

ZHANG Qian; WU Xiaojie; ZHONG Zhoucan; CAI Shuiku

doi:10.12090/j.issn.1006-6616.2024055

Volume 31 Issue 1

Feb. 2025

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Article Navigation > Journal of Geomechanics > 2025 > 31(1): 109-123

ZHANG Q，WU X J，ZHONG Z C，et al.，2025. Improving the inversion accuracy of shallow shear wave velocity structure based on microtremor method: A case study of Haikou Jiangdong New District[J]. Journal of Geomechanics，31（1）：109−123 doi: 10.12090/j.issn.1006-6616.2024055

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Improving the inversion accuracy of shallow shear wave velocity structure based on microtremor method: A case study of Haikou Jiangdong New District

doi: 10.12090/j.issn.1006-6616.2024055

ZHANG Qian^{1, 2
,},
WU Xiaojie^{1, 3
,
,},
ZHONG Zhoucan^{1, 3},
CAI Shuiku^{1, 3}

1.
Key Laboratory of Marine Geological Resources and Environment of Hainan Province, Haikou, Hainan 570206, China
2.
Hainan Survey Institute of Mineral Resources, Haikou 571100, Hainan, China
3.
Hainan Geological Survey Institute, Haikou 570206, Hainan, China

Funds: This research is financially supported by Key Laboratory of Marine Geological Resources and Environment of Hainan Province (Grants No. 22-HNHYDZZYHJKF023 and HNHYDZZYHJZZ003).

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Abstract

Abstract

Objective The microtremor survey method is not limited by the spatiotemporal distribution of seismic sources and has become an effective method for observing the structure of shallow shear wave velocity. An experiment to compare microtremor, drilling, and shear wave logging was conducted in Jiangdong New District. The experiment showed that the microtremor inversion results were consistent with the logging curve shape, and the shear wave velocities of the strata and the corresponding depths were basically in agreement. Thus, good application results can be achieved. However, it was found that the microtremor inversion strata and the drilled strata did not completely correspond. In terms of wave velocity, the microtremor results could not reveal an interface with a small difference in wave velocity, while the drilling data did not distinguish an interface with a large difference in wave velocity. The study of the influence mechanism of the two factors on the microtremor inversion results is helpful to improve the understanding of the microtremor inversion model and to obtain more reasonable inversion results. Methods On the basis of a small or a large wave velocity difference, a physical stratification model, a geological stratification model, and a combined model are designed. The factors and rules affecting the inversion results are discussed by dispersion curves, low-velocity layers, layer variations, and inversion method. Results The inversion results of the physical property stratification model can better reflect the location of a weak layer. Changing the interface mainly affects the adjacent layers. Adding interfaces with small and large differences in wave velocity increases and decreases the wave velocity errors of the adjacent layers, respectively. The interface with a large velocity difference has less influence on the velocity of the adjacent layers than an interface with a small velocity difference. A large error change is mainly caused by an interface with a small velocity difference, and the inversion is more sensitive to an interface with a small velocity difference. Conclusion The practical application of the microtremor method in Jiangdong New District of Haikou shows that it is helpful to improve the inversion accuracy of the wave velocity by merging the interfaces with smaller wave velocity differences or adding interfaces with larger wave velocity differences, without changing the local trend of the layer velocity. Significance The 2D microtremor shear wave velocity section was obtained by inverting the measured data. Combined with the depth and undulation information of the bedrock surface provided by drilling, it provides a reliable basis for the site condition evaluation and the underground space utilization planning of Haikou Jiangdong New District.
- shear wave velocity structure,
- wave velocity difference interface,
- inversion model,
- microtremor method

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