物探与化探2024，Vol.48Issue(2)：437-442,6.DOI:10.11720/wtyht.2024.1110
基于功率谱密度筛选的高海拔区背景噪声快速成像技术
A fast imaging technology for screening ambient noise in high-altitude areas based on power spectral density
摘要
Abstract
Acquiring empirical Green's functions with a real and high signal-to-noise ratio serves as a prerequisite for deriving surface wave dispersion and inverting underground structures.However,the distribution of actual noise sources differs from the theory,and the energy and quantity of noise sources are limited in the high-altitude areas.Acquiring empirical Green's functions with a high signal-to-noise ratio is challenging,apart from a prolonged data acquisition period required.Given these,this study presented a method for screen-ing ambient noise data based on power spectral density.Using this method,this study screened 92-hour ambient noise data from a high-altitude area.Consequently,this method significantly reduced the calculation time of cross-correlation,effectively extracted surface waves with a high signal-to-noise ratio,reduced the interference waves with high apparent velocities,and obtained a high-resolution shallow shear wave velocity structure of shallow parts with burial depths ranging from 0～140 m.This study provides a novel method for chal-lenging,short-term exploration of water conservancy and hydropower generation in high-altitude areas.关键词
功率谱密度/数据筛选/高海拔区/背景噪声成像/面波Key words
power spectral density/data selection/high-altitude area/ambient noise imaging/surface wave分类
天文与地球科学引用本文复制引用
刘迪,杨涛,宋华东,李广超,毋光荣,郭良春,张锦想..基于功率谱密度筛选的高海拔区背景噪声快速成像技术[J].物探与化探,2024,48(2):437-442,6.基金项目
黄河勘测规划设计研究院自主科研项目(2021KY050) （2021KY050）
