3D joint inversion of gravity gradiometry and magnetic data in spherical coordinates with the cross-gradient constraint

Haoran Wang; Yaoguo Li; Chao Chen

doi:10.1071/ASEG2015ab272

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa 3D joint inversion of gravity gradiometry and magnetic data in spherical coordinates with the cross-gradient constraint
Authors Haoran Wang^a, Yaoguo Li^b and Chao Chen^c
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^a China Uni. of Geosciences (Wuhan), 388 Lumo Road, Hongshan District Wuhan, 430074, , P. R. China, [email protected] ^b Colorado School of Mines, 1500 Illinois Street, Golden, CO, 80401, , USA, [email protected] ^c China Uni. of Geosciences (Wuhan), 388 Lumo Road, Hongshan District Wuhan, 430074, , P. R. China, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab272
- Published online: 01 Dec 2015

Abstract

Earth observing satellites offer exciting new opportunities to study the large-scale regional or global lithospheric structures by producing reliable potential-field data sets including gravity, gravity gradiometry, and magnetic data that are publicly accessible. Joint inversions may offer an effective means of utilizing these different types of data to improve the construction lithospheric models. In this paper, we develop a joint inversion algorithm for satellite gravity gradiometry and magnetic data in the spherical coordinates for simultaneously constructing the density and susceptibility distributions in the lithosphere. Given the undetermined relationship between the two different physical properties, we apply the cross gradient to constrain the two recovered models so they structurally similar. We use a synthetic data example to illustrate the algorithm and its potential benefits. We will also demonstrate the algorithm by applications to field data sets in the presentation.

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References

Asgharzadeh, M. F., von Frese, R. R. B., Kim, H. R., Leftwich, T. E., and Kim, J. W., 2007, Spherical prism gravity effects by Gauss-Legendre quadrature integration: Geophysical Journal International, 169, 1-11.
Du, J., Chen, C., Liang, Q., Wang, H., Li, Y., and Lane, R., 2013, 3-D inversion of the regional magnetic data in spherical coordinates and its preliminary application in Australia: ASEG Extended Abstracts 2013, 1, 1-4.
Fregoso, E., and Gallardo, L. A., 2009, Cross-gradients joint 3D inversion with applications to gravity and magnetic data: Geophysics, 74(4), L31-L42.
Gallardo, L. A., and Meju, M. A., 2003, Characterization of heterogeneous near-surface materials by joint 2D inversion of DC resistivity and seismic data: Geophysical Research Letters, 30(13), 1658.
Li, Y., and Oldenburg, D. W., 1996, 3-D Inversion of magnetic data: Geophysics, 61, 394-408.
Liang, Q., Chen, C., and Li, Y., 2014, 3-D inversion of gravity data in spherical coordinates with application to the GRAIL data: Journal of Geophysical Research, 119: 13591373.
Nocedal, J., and Wright, S., 2006, Numerical optimization, 2nd Edition, Springer, New York

/content/journals/10.1071/ASEG2015ab272

Article Type: Research Article

Keyword(s): cross-gradient; gravity gradiometry; joint inversion; magnetic anomaly; spherical coordinates

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oa 3D joint inversion of gravity gradiometry and magnetic data in spherical coordinates with the cross-gradient constraint

Abstract

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