A strategy for magnetic data interpretation in South China Sea

Shuling Li; Yaoguo Li; Xiaohong Meng

doi:10.1071/ASEG2015ab233

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

ISSN: 2202-0586
E-ISSN:

oa A strategy for magnetic data interpretation in South China Sea
Authors Shuling Li^a, Yaoguo Li^b and Xiaohong Meng^c
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^a China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, Beijing, , China, [email protected] ^b Colorado School of Mines, 1500 Illinois Street, Golden, , USA, [email protected] ^c China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, Beijing, , 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/ASEG2015ab233
- Published online: 01 Dec 2015

Abstract

Directly interpreting total-field magnetic anomaly data in the South China Sea (SCS) can be difficult because of the complex patterns associated with low-latitude anomaly projection and the presence of remanent magnetization. Additional difficulty arises from the fact that the ambient field direction, thus, the total-field anomaly projection direction, varies over a wide range in the area. To alleviate these difficulties, we present a strategy by using magnetic amplitude data analyses and inversion. Equivalent source processing is used to calculate the amplitude data in the space domain since the wavenumber-domain method is no longer applicable due to low and highly variable inclination. The amplitude data serve the role of reduction-to-pole (RTP) transformation for structural interpretation. We then carry out the amplitude inversion to generate a 3D subsurface distribution of effective susceptibility. The inversion results show that this approach is feasible and effective in SCS.

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References

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Article Type: Research Article

Keyword(s): Amplitude inversion; Equivalent source technique; Low magnetic latitudes; Remanent magnetization; South China Sea

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