CT理论与应用研究2026，Vol.35Issue(5)：821-829,9.DOI:10.15953/j.ctta.2025.148
走时互易性约束壳幔速度结构的反演方法及其在帕米尔地区的应用
An Inversion Method for Crust-mantle Velocity Structure Constrained by Traveltime Reciprocity:Case Study of Pamir Region
摘要
Abstract
Seismic wave propagation exhibits traveltime reciprocity;thus,the traveltime remains unchanged when the positions of the source and receiver are interchanged.This study proposes a traveltime reciprocity tomography method designed for regions without or with sparse seismic station coverage.Moreover,the method utilizes traveltime data recorded at distant seismic stations,combined with theoretical propagation paths and traveltime estimations,to invert the crust-mantle velocity structure within and around the earthquake source region.We selected 40 earthquakes and 121 seismic stations within a 3 000 km radius in the Pamir Plateau region to perform traveltime reciprocity tomography inversion.The impacts of different traveltime estimation approaches and variations in the study area boundaries were evaluated.Furthermore,the traveltime reciprocity tomography results were compared with those obtained from traditional local earthquake tomography to verify the accuracy and reliability of the inversion.The tests demonstrated that velocity structure features derived from different estimation methods are highly consistent.In addition,major structural units can be recovered under varying study area boundaries,indicating strong regional adaptability.Compared with traditional local earthquake tomography,the traveltime reciprocity tomography produced reliable inversion results.In addition,it yielded a slightly broader crust-mantle structural image extending beyond the source region,making it suitable for seismic source zones that lack station coverage or have limited observational conditions.This study provides a practical and feasible alternative approach for deep structure imaging,with promising potential for practical applications and broader dissemination.关键词
层析成像/走时互易性/台站稀疏Key words
tomography/traveltime reciprocity/sparse station coverage分类
天文与地球科学引用本文复制引用
张风雪,李昱,陈泆平..走时互易性约束壳幔速度结构的反演方法及其在帕米尔地区的应用[J].CT理论与应用研究,2026,35(5):821-829,9.基金项目
国家自然科学基金(宁夏地区岩石圈多参数结构建模与动力学数值模拟研究(U23A2029)) （宁夏地区岩石圈多参数结构建模与动力学数值模拟研究(U23A2029）
地震科技星火计划(阿尔山火山岩浆囊系统储存规模探测研究(XH25004C)). （阿尔山火山岩浆囊系统储存规模探测研究(XH25004C）
