Using Lower Degrees of Geoid Anomalies to Invert Large Scale Undulations of Core-Mantle Boundary

CUI Ronghua; FANG Jian; LIU Jie; LI Honglei; CHEN Ming

doi:10.13203/j.whugis20150577

Volume 43 Issue 5

May 2018

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Geomatics and Information Science of Wuhan University > 2018 > 43(5): 658-663. > DOI: 10.13203/j.whugis20150577

CUI Ronghua, FANG Jian, LIU Jie, LI Honglei, CHEN Ming. Using Lower Degrees of Geoid Anomalies to Invert Large Scale Undulations of Core-Mantle Boundary[J]. Geomatics and Information Science of Wuhan University, 2018, 43(5): 658-663. DOI: 10.13203/j.whugis20150577

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Using Lower Degrees of Geoid Anomalies to Invert Large Scale Undulations of Core-Mantle Boundary

CUI Ronghua^{1, 2,},
FANG Jian¹,
LIU Jie^{1, 3},
LI Honglei^{1, 2},
CHEN Ming^{1, 2}

1.
State Key Laboratory of Geodesy and Eaerh's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China

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>The National Program on Key Basic Researth Project of China(973 Program) 2013CB733301

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CUI Ronghua, PhD candidate, specializes in Earth's gravity field. E-mail: rhcui@asch.whigg.ac.cn
Received Date: April 30, 2016
Published Date: May 04, 2018

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Abstract

The core-mantle boundary (CMB) is one of the most important physical and chemical interfaces in the earth's interior, through which a variety of interactions occur between Earth's core and mantle. These interactions might have great impacts on Earth's gravity field, rotation and magnetic field. The geoid anomalies is an important observation of the earth's gravity field, which reflects significant information of the earth's interior, such as material density anomalies and interfaces, etc. A formula using the geoid anomalies to invert undulations of core-mantle boundary was derived. The large-scale undulations of the core-mantle boundary were calculated by this formula from degree 2 to 4. The result showed that the amplitude of core-mantle boundary undulations reached ±5 km, which corresponded to that obtained by Morelli using seismic tomography, but showed some differences in the worldwild distribution. We also simulated influences of the density anomalies in the core-mantle boundary to the geoid undulation using a prism model with height of 5 km and base length of 1 000 km. The result showed that it was closed to the observed value of geoid undulations.
- geoid anomalies,
- core-mantle boundary undulations,
- seismic tomography,
- Earth's gravity field

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