Preprints
https://doi.org/10.5194/se-2021-117
https://doi.org/10.5194/se-2021-117
30 Sep 2021
 | 30 Sep 2021
Status: this preprint was under review for the journal SE but the revision was not accepted.

Interpolation of magnetic anomalies over an oceanic ridge region using an equivalent source technique and crust age model constraint

Duan Li, Jinsong Du, Chao Chen, Qing Liang, and Shida Sun

Abstract. Marine magnetic surveys over oceanic ridge regions are of great interest for investigations of structure and evolution of oceanic crust, and have played a key role in developing the theory of plate tectonics (Dyment, 1993; Maus et al, 2007; Vine and Matthews, 1963). In this study, we propose an interpolation approach based on the dual-layer equivalent source model for the generation of a magnetic anomaly map based on sparse survey line data over oceanic ridge areas. In this approach, information from an ocean crust age model is utilized as constraint for the inversion procedure. The constraints can affect the magnetization distribution of equivalent sources following crust age. The results of synthetic tests show that the obtained magnetic anomalies have higher accuracy than those obtained by other interpolation methods. Meanwhile, considering the unclear on the true magnetization directions of sources and the background field in the synthetic model, well interpolation result can still be obtained. We applied the approach to magnetic data obtained from five survey lines east of the Southeast Indian Ridge. This prediction result is useful to improve the lithospheric magnetic field models WDMAMv2 and EMAG2v3, in the terms of spatial resolution and the consistency with observed data.

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Duan Li, Jinsong Du, Chao Chen, Qing Liang, and Shida Sun

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'General comments on se-2021-117', Anonymous Referee #1, 18 Nov 2021
    • AC2: 'Reply on RC1', Jinsong Du, 20 Feb 2022
  • RC2: 'Specific comments on se-2021-117', Anonymous Referee #1, 18 Nov 2021
    • AC1: 'Reply on RC2', Jinsong Du, 20 Feb 2022
  • RC3: 'Comment on se-2021-117', Anonymous Referee #2, 18 Jan 2022
    • AC3: 'Reply on RC3', Jinsong Du, 20 Feb 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'General comments on se-2021-117', Anonymous Referee #1, 18 Nov 2021
    • AC2: 'Reply on RC1', Jinsong Du, 20 Feb 2022
  • RC2: 'Specific comments on se-2021-117', Anonymous Referee #1, 18 Nov 2021
    • AC1: 'Reply on RC2', Jinsong Du, 20 Feb 2022
  • RC3: 'Comment on se-2021-117', Anonymous Referee #2, 18 Jan 2022
    • AC3: 'Reply on RC3', Jinsong Du, 20 Feb 2022
Duan Li, Jinsong Du, Chao Chen, Qing Liang, and Shida Sun
Duan Li, Jinsong Du, Chao Chen, Qing Liang, and Shida Sun

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Short summary
Oceanic magnetic anomalies are generally carried out using only few survey lines and thus there are many areas with data gaps. Traditional interpolation methods based on the morphological characteristics of data are not suitable for data with large gaps. The use of dual-layer equivalent-source techniques may improve the interpolation of magnetic anomaly fields in areas with sparse data which gives a good consideration to the extension of the magnetic lineation feature.