期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 180, 期 3-4, 页码 111-117出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.pepi.2010.02.007
关键词
EM induction; electrical conductivity; D '' layer
资金
- Grant Agency of the Czech Republic [205/08/P229]
Time-domain EM induction is used to obtain 1-D conductivity structure in the Earth using seven years of vector magnetometer measurements by the CHAMP satellite. An optimal model is obtained by means of quasi-Newton minimization with regularization. Sensitivity of data to deep Earth conductivity is checked by limited grid search of the model space in the vicinity of the optimal model. While regularization plays a considerable role in constraining the conductivity model, data misfit poses upper limits on the lower mantle and D '' conductivity at 2 S/m, and 10 S/m, respectively. (C) 2010 Elsevier B.V. All rights reserved.
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