Retrieving lithospheric magnetisation distribution from magnetic field models [PDF]
Geophysical Journal International, 2019 Summary We investigate to which extent the radially averaged magnetisation of the lithosphere can be recovered from the information content of a spherical harmonic model of the generated magnetic field when combined with few simple hypotheses.
Lesur, V, Vervelidou, F
openaire +5 more sources
Magnetic Inversion and Regional Tectonics of the Dabie Orogen
, 2023 Physical property inversion techniques are the methods to reveal the internal structures of Earth’s lithosphere. In this study, we introduce an Occam-type inversion algorithm into a spherical coordinate system, and invert the magnetization based on
Guangyin Lu +6 more
core +1 more source
Non-singular spherical harmonic expressions of geomagnetic vector and gradient tensor fields in the local north-oriented reference frame [PDF]
Geoscientific Model Development, 2015 General expressions of magnetic vector (MV) and magnetic gradient tensor (MGT) in terms of the first- and second-order derivatives of spherical harmonics at different degrees/orders are relatively complicated and singular at the poles. In this paper, we
J. Du, C. Chen, V. Lesur, L. Wang
doaj +1 more source
Modelling Earth’s lithospheric magnetic field using satellites in low-perigee elliptical orbits
, 2023 The sensitivity of magnetic measurements taken by satellites in elliptical orbits to the lithospheric magnetic field is studied by comparing the formal error variances of the lithospheric Gauss coefficients for various satellite orbital constellations ...
Olsen, Nils
core +1 more source
Geopotential field anomalies and regional tectonic features – two case studies: southern Africa and Germany [PDF]
Solid Earth, 2016 Maps of magnetic and gravity field anomalies provide information about physical properties of the Earth's crust and upper mantle, helpful in understanding geological conditions and tectonic structures.
M. Korte, M. Mandea
doaj +1 more source
Magnetic Structure and its Tectonic Implication Around Longmenshan Fault Zone Revealed by EMAG2v3
Frontiers in Earth Science, 2022 The formation of magnetic minerals is bound up with the tectonic evolution history, whereupon the distribution of magnetic anomalies has great meanings for regional tectonics.
Yu Lei +6 more
doaj +1 more source
Sources of the lithosphere magnetic field based on magnetic data obtained at different heights [PDF]
Earth, Planets and Space, 2018 Abstract Our investigations are based on the property that the fields of sources, whose depths are numerically equal to survey heights, are most brightly presented in the data of magnetic survey. Therefore, the magnetic field created by the upper boundary of the magnetically active layer is well presented in the data of magnetic surveys (survey heights
Yury P. Tsvetkov +3 more
openaire +2 more sources
2021年5月22日玛多MS7.4地震震前岩石圈磁场变化特征分析
Dizhen xuebao, 2021 本文利用2019年和2020年两期的全国流动地磁矢量数据，针对玛多MS7.4地震震中附近的岩石圈磁场空间分布，分析研究了岩石圈磁场各个分量的震前变化特征。结果表明，玛多MS7.4地震发生前，震中附近的岩石圈磁场分量均发生了不同程度的变化：震中位于各分量的弱变化区域和零变线附近；震中位于各分量的高梯度带和低梯度带之间。本文证实了地震发生前会引起岩石圈磁场变化这一现象，并总结了震前地磁分量的变化特征，为今后强地震（尤其是M≥7.0地震）的震磁关系研究提供了一个震例参考。
Chao Dong +4 more
doaj +1 more source
Global lithospheric magnetic field modelling by successive regional analysis [PDF]
Earth, Planets and Space, 2006 AbstractPresent lithospheric field models, like the MF4 and CM4, are produced by least squares estimation using spherical harmonic basis functions with global support. Accounting for the different properties of magnetic data at low and high latitudes, a method that can take regional differences into account is proposed.
openaire +2 more sources
A new approach to earthquake precursors distinction
Геофизический журнал, 2012 A lithospheric ultra low frequency (ULF) magnetic activity is recently considered as very promising candidate for application to short-time earthquake (EQ) forecasting.
V. E. Korepanov, F. L. Dudkin
doaj +1 more source