1. Guangdong Transportation Industry Investment Co., Ltd., Guangzhou 510263, China 2. Hunan Zhili Technology Co., Ltd., Changsha 410036, China 3. School of Geosciences and Info-physics, Central South University, Changsha 410083, China
Offset and source weight constitute critical factors influencing the data acquisition of transient Rayleigh surface waves. Hence, it is necessary to examine the characteristics of dispersion spectra derived from surface wave data acquired under different offsets and source weights. This study investigated the influence of the two critical factors on dispersion spectra through theoretical analysis and numerical simulation. Based on field experiments, this study delved into the characteristics of dispersion spectra from surface wave data collected at various excitation locations of seismic sources with different weights. To address the discrepancies in dispersion spectra caused by varying source locations during the data acquisition of transient surface waves, this study proposed a superposition and fusion method for multi-dispersion spectra, significantly enhancing the effectiveness of surface wave detection results.
Li Q C, Shao G Z, Liu J L, et al. Past, present and future of Rayleigh surface wave exploration[J]. Journal of Earth Sciences and Environment, 2006, 28(3):74-77.
Liu D H, Xu J J, Liu L, et al. Application of the integrated geophysical methods in the fine exploration of karst collapses:A case study of Wuhan City[J]. Geology and Exploration, 2022, 58(4):865-874.
Xia J H, Gao L L, Pan Y D, et al. New findings in high-frequency surface wave method[J]. Chinese Journal of Geophysics, 2015, 58(8):2591-2605.
[4]
Eker A M, Akgün H, Koçkar M K. Local site characterization and seismic zonation study by utilizing active and passive surface wave methods:A case study for the northern side of Ankara,Turkey[J]. Engineering Geology, 2012,151:64-81.
Li S L, Hu Z A, Wu H B. Response characteristics of covered karst cave in transient Rayleigh surface wave exploration[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2019, 41(4):541-546.
Song X H, Zhang X Q, Wang Y M, et al. Recent advances and prospects of near surface elastic Rayleigh waves[J]. Bulletin of Geological Science and Technology, 2020, 39(5):173-182.
Zhou R L, Liu Y H, Xu R Z. Application of multi-channel transient surface wave in settlement investigation of LNG tank farm[J]. Chinese Journal of Engineering Geophysics, 2022, 19(2):162-167.
Yang Z T, Chen X F, Pan L, et al. Multi-channel analysis of Rayleigh waves based on the vector wavenumber tansformation method(VWTM)[J]. Chinese Journal of Geophysics, 2019, 62(1):298-305.
Su Y, Yang Z T, Yang B, et al. Application research of active source Rayleigh wave multi-mode extraction method based on vector wavenumber transformation method in near surface stratigraphic structure detection[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2020, 56(3):427-435.
[12]
Xu Y X, Zhang B L, Luo Y H, et al. Surface-wave observations after integrating active and passive source data[J]. The Leading Edge, 2013, 32(6):634-637.
[13]
Liu Y, Xia J H, Cheng F, et al. Pseudo-linear-array analysis of passive surface waves based on beamforming[J]. Geophysical Journal International, 2019, 221(1):640-650.
[14]
Liu Y, Xia J H, Xi C Q, et al. Improving the retrieval of high-frequency surface waves from ambient noise through multichannel-coherency-weighted stack[J]. Geophysical Journal International, 2021, 227(2):776-785.
doi: 10.1093/gji/ggab253
[15]
Satoh T. S-wave velocity structure of the Taichung basin,Taiwan,estimated from array and single-station records of microtremors[J]. Bulletin of the Seismological Society of America, 2004, 91(5):1267-1282.
Liu Z K, Huang J L. Temporal changes of seismic velocity around the Wenchuan earthquake fault zone from ambient seismic noise correlation[J]. Chinese Journal of Geophysics, 2010, 53(4):853-863.
[17]
Pan Y D, Xia J H, Xu Y X, et al. Delineating Shallow S-wave velocity structure using multiple ambient-noise surface-wave methods:An example from western Junggar,China[J]. Bulletin of the Seismological Society of America, 2016, 106(2):327-336.
Li X Y, Chen X F, Yang Z T, et al. Application of high-order surface waves in shallow exploration:An example of the Suzhou river,Shanghai[J]. Chinese Journal of Geophysics, 2020, 63(1):247-255.
Qin C C, Wang G S, Li J. Improvement in active-source surface wave acquisition device and its application in subway construction exploration[J]. Geophysical and Geochemical Exploration, 2024, 48(1):264-271.
[20]
Xu Y X, Xia J H, Miller R D. Quantitative estimation of minimum offset for multichannel surface-wave survey with actively exciting source[J]. Journal of Applied Geophysics, 2006, 59(2):117-125.
[21]
Park C B, Miller R D, Xia J H. Multichannel analysis of surface waves[J]. 1999, 64(3):800-808.
[22]
Xu Y X, Xia J H, Miller R D. Numerical investigation of implementation of air-earth boundary by acoustic-elastic boundary approach[J]. Geophysics, 2007, 72(5):SM147-SM153.
