CT理论与应用研究2026，Vol.35Issue(5)：851-859,9.DOI:10.15953/j.ctta.2025.485
不同分裂强度计算方法的各向异性成像对比研究:以川滇地区为例
Anisotropic Tomography Based on Different Calculations of Splitting Intensity in the Sichuan-Yunnan Region
摘要
Abstract
Seismic tomography provides a fundamental approach for probing the internal structure of the Earth.In recent years,imaging methods based on shear-wave splitting intensity(SI)have steadily advanced,enhancing investigations into upper-mantle anisotropy.In practice,SI is measured by projecting the transverse component of a shear wave onto the time derivative of the radial component.Under low-frequency conditions and for small delay-time conditions(ωδt ≪ 1 or ωδt → 0),SI follows a sinusoidal relationship with the splitting parameters,φ and δt.By retaining the complete mathematical expressions of the radial and transverse components and substituting them into the projection-based integral definition,a new relationship incorporating the dominant angular frequency,ω,can be derived.While,current anisotropic imaging studies generally adopt waveform-derived SI as the observational constraint,the imaging performance of SI calculated from pre-estimated splitting parameters remains poorly understood.Focusing on the Sichuan-Yunnan region,this study systematically compares anisotropic imaging results obtained from three types of SI:waveform-measured SI,SI calculated using the conventional sinusoidal relation,and SI derived from the new frequency-dependent formulation.The results demonstrate that,compared with the conventional sinusoidal formulation,imaging based on the new relationship yields structures that are more consistent with those obtained from waveform-derived SI,indicating its improved reliability for anisotropic tomography.关键词
各向异性成像/分裂强度/川滇地区Key words
anisotropic tomography/splitting intensity/Sichuan-Yunnan region分类
天文与地球科学引用本文复制引用
王俊淑,石玉涛,琚长辉,李国辉,高原..不同分裂强度计算方法的各向异性成像对比研究:以川滇地区为例[J].CT理论与应用研究,2026,35(5):851-859,9.基金项目
中国地震局地震预测研究所基本科研业务费(天山造山带地幔熔体上涌与强震孕育研究(CEAIEF20240203)) （天山造山带地幔熔体上涌与强震孕育研究(CEAIEF20240203）
国家自然科学基金(青藏高原及邻区D"层低速体结构成像(42374123)) （青藏高原及邻区D"层低速体结构成像(42374123）
重点研发青年科学家项目(喜马拉雅东构造结及邻区多圈层各向异性结构(2024YFF0809503)). （喜马拉雅东构造结及邻区多圈层各向异性结构(2024YFF0809503）
