石油地球物理勘探2025，Vol.60Issue(2)：322-332,11.DOI:10.13810/j.cnki.issn.1000-7210.20230422
地震密集阵列换算旋转分量的方法
Methodology for converting the rotational component of seismic dense arrays
摘要
Abstract
As the rotational components of seismic waves capture both the rotational motion of particles and spa-tial gradient field information,they offer certain advantages in seismic source localization,P-and S-wave field separation,and subsurface velocity inversion imaging.However,the high cost and limited availability of rota-tional seismometers have resulted in scarce observational data on rotational components,making it difficult to conduct in-depth research on their application value using limited data.Consequently,many traditional methods and techniques developed for translational seismic components are restricted in the study of rotational compo-nents.This paper,based on simulated and measured data,conducts experimental comparisons of the conversion of rotational components in dense seismic arrays using the differential and wavefield gradient methods.The re-sults reveal that the wavefield gradient method exhibits superior conversion accuracy compared to the differen-tial method.Furthermore,this study places particular emphasis on analyzing the impact of inter-array spacing and subsurface velocity on the conversion accuracy and discusses the optimal frequency range for array-based ro-tational component calculations.Additionally,this paper focuses on analyzing the influence of inter-array spa-cing and site phase velocity on conversion accuracy and derives a relationship for calculating the frequency range of translational-to-rotational component conversion.The accuracy of converting rotational components in dense arrays is affected by array spacing,site phase velocity,and target frequency.Given the conditions of the obser-vational system,the derived relationship can be used to calculate the target frequency range,within which the computed rotational components show a high degree of fit with the observed rotational components,with a maximum correlation coefficient reaching 0.98.关键词
地震旋转分量/波场梯度法/差分法/阵列间距Key words
seismic rotational components/wavefield gradient method/differential method/array spacing分类
天文与地球科学引用本文复制引用
蒋侗晓,苏荣华,刘建,张壹,李小平,王赟..地震密集阵列换算旋转分量的方法[J].石油地球物理勘探,2025,60(2):322-332,11.基金项目
本项研究受国家自然科学基金项目"地震旋转运动对高层建筑的影响研究"(42150201)、"高灵敏超低噪声光纤振动测量仪"(62127815)及"六分量地震波场的模拟与观测"(U1839208)联合资助. （42150201）
