物探化探计算技术2025，Vol.47Issue(3)：352-359,8.DOI:10.12474/wthtjs.20240410-0002
阿拉斯加地区660km间断面结构研究
Structure of the 660 km discontinuity in Alaska
摘要
Abstract
The depth,thickness,velocity,and density jump across the mantle transition zone discontinuities offer essential constraints on the Earth's interior's temperature,compositional component,and dynamical evolution.We collect seismic data from 663 seismic stations in Alaska,and present an investigation of the thickness and the S-wave velocity jump across the 660 km discontinuity by multiband P660s/P/P amplitudes.Our inversions show that the transition width and the shear velocity jump are(1.66 km,5.95%)for the 660 km discontinuity in Alaska.The S-wave velocity jump indicates a 10%～20%basalt fraction near the 660 km discontinuity,and the bottom of the mantle transition zone is enriched in harzburgite.The 660 km discontinuity is post-spinel transition-dominated.关键词
660km间断面/横波速度跃变/间断面厚度/阿拉斯加/多频段接收函数Key words
the 660 km discontinuity/S-wave velocity jump/discontinuity thickness/Alaska/multiband receiver function分类
地球科学引用本文复制引用
冯麟淇,邓凯..阿拉斯加地区660km间断面结构研究[J].物探化探计算技术,2025,47(3):352-359,8.基金项目
国家自然科学基金项目(41904086) （41904086）
