物探化探计算技术2024，Vol.46Issue(4)：386-394,9.DOI:10.3969/j.issn.1001-1749.2024.04.02
中国东北地区410间断面结构及其动力学启示
Structure of the 410 discontinuity in Northeast China and its dynamic enlightenment
摘要
Abstract
The mantle transition zone is an important water storage reservoir on the Earth.The sharpness of the mantle discontinuities and the seismic wave velocity jump across the discontinuities can provide essential constraints on the water con-tent and mineral composition near the transition zone.In this study,we extract the amplitude of multi-band Pds conversion wave from the open seismic data recorded by four temporary arrays in Northeast China.We simultaneously obtain the shear wave velocity jump across the 410-km discontinuity and its sharpness using the Markov Chain Monte Carlo method(MCMC).The results show that the sharpness of 410 discontinuity in this area has reached～25 km,and the shear wave velocity has in-creased～6.9%in this depth interval.We believe that the continuous dehydration of the Pacific plate at the bottom of the tran-sition zone increased the water content at the top of the transition zone(>0.5 wt.%),which made the minerals at or above the state of fluid saturation,resulting in partial melting of the minerals,forming low-velocity and low-resistivity anomalies,and at the same time,significantly thickening of the 410 discontinuity compared with that without water(～7 km).关键词
中国东北/接收函数/马尔科夫链蒙特卡罗法/410km间断面/含水量Key words
Northeast China/receiver function/Markov chain Monte Carlo method/410 km discontinuity/water con-tent分类
天文与地球科学引用本文复制引用
王小虎,薛静..中国东北地区410间断面结构及其动力学启示[J].物探化探计算技术,2024,46(4):386-394,9.基金项目
国家自然科学基金(41904086) （41904086）
