河南理工大学学报（自然科学版）2025，Vol.44Issue(2)：61-68,89,9.DOI:10.16186/j.cnki.1673-9787.2023120033
SPAC法在第四系地层分层中的应用
Application of SPAC method in dividing strata of the Quaternary strata
摘要
Abstract
The SPAC method is one of the most effective methods of extracting phase velocity from environ-mental noise.The calculation of S-wave velocity structure by the SPAC method has important scientific sig-nificance for studying velocity structure.Objectives To verify the reliability of the SPAC method in dividing strata of the Quaternary strata,Methods this study used a multi-observation array to collect microtremor sig-nals within 2 to 40 Hz.It calculated the spatial autocorrelation coefficients among Stations A,B,and C groups and the central station.Furthermore,it used zero-order Bessel functions to fit the spatial autocorrela-tion coefficients,and extracted the phase velocity-frequency relationship from the Rayleigh surface wave to obtain the phase velocity dispersion curve.Compared with models with the Low-Velocity Soft Layer Model,the High-Velocity Hard Layer Model,and the Velocity-Increasing Model,the Forking Genetic Algorithm fGA has the advantage of not relying on the initial model for inverting dispersion curves.Results Taking the measured data from a certain location on the northern edge of the North China Craton as an example,it used the SPAC,transient Rayleigh surface wave,and wave velocity logging methods to invert the S-wave velocity structure.According to the drilling data,It found that at the depth of 6.7 to 9.0 m underground,the fully weathered gneiss exhibited S-wave velocities as low as 305 m/s,whereas the strongly weathered plagioclase gneiss showed higher S-wave velocities ranging from 430 to 540 m/s below 9.0 m.Conclusions Based on the comprehensive analysis of SPAC,transient Rayleigh surface wave,wave velocity logging methods and drilling data,it can be concluded that the accuracy of stratigraphic stratification and S-wave velocity value of the SPAC method are consistent with other results,which verifies the reliability of the SPAC method.关键词
SPAC法/微动信号/S波速度结构/频散曲线/Rayleigh面波Key words
SPAC method/microtremor signal/S-wave velocity structure/dispersion curve/Rayleigh sur-face wave分类
天文与地球科学引用本文复制引用
李宝春,孙少槐,李国平..SPAC法在第四系地层分层中的应用[J].河南理工大学学报（自然科学版）,2025,44(2):61-68,89,9.基金项目
国家自然科学基金资助项目(42167023) （42167023）
内蒙古自然科学基金资助项目(2021LHBS04002,2023QN04007) （2021LHBS04002,2023QN04007）
