石油地球物理勘探2025，Vol.60Issue(3)：679-688,10.DOI:10.13810/j.cnki.issn.1000-7210.20240294
应用连通域分析的微动面波频散曲线自动提取方法
Automatic extraction method of microtremor surface wave dispersion curve based on connected domain analysis
摘要
Abstract
Microtremor imaging technology extracts surface wave signals from the weak vibrations and noise that persist on the Earth,and then utilizes dispersion characteristic of the surface wave to detect underground structures.In recent years,it has been widely used in imaging the internal structures of the Earth at different scales.Obtaining accurate and reliable dispersion curves is the key to microtremor imaging.However,due to the low signal-to-noise ratio of microtremor surface wave signal,the dispersion energy spectrum of virtual shot-gather has low resolution,is cluttered,and is subject to much interference.Thus,the efficiency and accuracy of manual extraction of dispersion curves are low.This paper introduces digital image processing technology,re-gards the dispersion energy spectrum of the virtual shot-gather as an image,and uses the connected domain analysis algorithm to label each energy group in the image.The surface wave information is identified and pre-served based on the band-like connectivity feature,and the interfering energy groups are suppressed.Conse-quently,a high-resolution energy spectrum image containing only surface wave dispersion strips is obtained,and the peak values of each frequency section in the image are automatically identified to obtain phase velocities.Fi-nally,the Hampel filtering is used to eliminate highly deviated values in phase velocities,and the dispersion curve is automatically extracted by fitting reasonable phase velocities for each frequency.The accuracy and ef-fectiveness of the automatic extraction method are validated through simulated data from two sets of theoretical stratigraphic models.The proposed method is applied to the processing of actual microtremor data in a certain research area in Jiangxi,the dispersion curves of multiple sets of virtual shot-gather are successfully extracted,and a two-dimensional shear wave velocity profile of the research area is established through inversion.This method achieves automatic processing and imaging of microtremor data while ensuring accuracy.关键词
微动/连通域分析/面波/频散曲线/自动提取Key words
microtremor/connected domain analysis/surface wave/dispersion curve/automatic extraction分类
天文与地球科学引用本文复制引用
李欣欣,郑晓慧,宋同,方红萍,姜昆..应用连通域分析的微动面波频散曲线自动提取方法[J].石油地球物理勘探,2025,60(3):679-688,10.基金项目
本项研究受国家自然科学基金项目"基于射线追踪的复杂近地表噪声面波三维有限频层析成像研究"(42004110)和陕西省自然科学基础研究计划项目"起伏地形多分量噪声面波有限频衰减成像与Q值反演研究"(2025JC-YBMS-282)联合资助. （42004110）
