地球与行星物理论评（中英文）2026，Vol.57Issue(5)：595-606,12.DOI:10.19975/j.dqyxx.2025-053
利用背景噪声互相关研究二连浩特—双辽断面下方地幔转换带变化
Variations of the mantle transition zone beneath the transection from Erenhot to Shuangliao revealed by ambient noise cross-correlation
摘要
Abstract
To reveal the subduction process of the western Pacific Plate and its impact on the overlying plate,this study utilizes data from the NECsaids-III broadband seismic array deployed in Northeastern China(the Eren-hot-Shuangliao profile)and extracts reflected body wave signals from the mantle transition zone(MTZ)using the ambient noise cross-correlation method.A common reflection point stacked profile is constructed,and by identify-ing and tracking the reflected P-wave phases from the upper and lower boundaries of the MTZ(P410P and P660P),the lateral variations of the MTZ across the north-south gravity lineament(NSGL)are obtained.The results indi-cate that the P410P and P660P phases along the profile exhibit clear segmentation.Near the NSGL,the phases are relatively chaotic and difficult to track,while on both sides,the continuity is better,with multiple strong reflection segments.Specifically,beneath the Erenhot Basin and the Greater Khingan Range region,the phases are clear and stable,with slight fluctuations in their arrival times.The deviations from the reference two-way travel time are,on average,no more than±1 s,corresponding to depth variations of less than 5 km.Beneath the southern Songliao Basin,the phases are advanced and delayed by approximately 4 s,respectively,relative to the reference two-way travel time,indicating a significant thickening of the MTZ by over 30 km.Combined with existing seismic images,it is inferred that the significant thickening of the MTZ and the presence of high-velocity body within it beneath the southern Songliao Basin are related to the stagnation of the subducted western Pacific Plate in the MTZ of this re-gion.In contrast,the high-velocity bodies within or just above the MTZ beneath the Greater Khingan Range and the Erenhot Basin have negligible impact on the MTZ discontinuities,suggesting that these high-velocity bodies differ significantly in nature from the stagnant oceanic plate and are likely derived from the delamination of the overlying continental lithosphere.关键词
地幔转换带/中国东北/南北重力梯度带/背景噪声互相关/反射体波/太平洋板块俯冲/滞留板片/大陆岩石圈拆沉Key words
mantle transition zone/Northeastern China/north-south gravity lineament/ambient noise cross-correlation/reflection body wave/subduction of the Pacific Plate/stagnant slab/delamination of the continental lithosphere分类
天文与地球科学引用本文复制引用
张宇宁,陈赟,曾骏,陈棋福..利用背景噪声互相关研究二连浩特—双辽断面下方地幔转换带变化[J].地球与行星物理论评（中英文）,2026,57(5):595-606,12.基金项目
国家重点研发计划资助项目(2022YFF0801003) （2022YFF0801003）
中国科学院战略性先导科技专项(B 类)资助项目(XDB18000000) Supported by the National Key Research and Development Program of China(Grant No.2022YFF0801003),and the Strategic Pri-ority Research Program(B)of Chinese Academy of Sciences(Grant No.XDB18000000) （B 类）
