Aeromagnetic 3D subsurface imaging with effective source volume minimisation and its application to data from the Otoge cauldron, Shitara, Central Japan
Tadashi Nakatsuka 1 2 Shigeo Okuma 1
+ Author Affiliations
- Author Affiliations
1 Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba 305-8567, Japan.
2 Corresponding author. Email: tad.nktk@ni.aist.go.jp
Exploration Geophysics 45(1) 16-23 https://doi.org/10.1071/EG13022
Submitted: 26 February 2013 Accepted: 5 June 2013 Published: 27 June 2013
Abstract
Three-dimensional (3D) imaging techniques using the conjugate gradient solution are discussed for magnetic anomaly source reconstruction, especially for areas of rugged terrain, such as those of volcanoes. The analysis model configuration permits surface undulation and variable depth slicing. First, primitive source model data are put into the analysis to confirm the characteristic behaviour of the regularisation methods and parameter scaling. The compact regularisation method is then applied to synthetic geologic models to understand the resolving power of the method given the problem of the inherent weakness of a non-unique solution. Finally, the field data of a helicopter-borne magnetic survey of the Otoge cauldron are put into the 3D imaging analysis with the method. The analysis reveals a quite reasonable subsurface image of the magma reservoir and the Otoge cone sheets and Otoge stocks of post-cauldron activity, as inferred from geological studies.
Key words: 3D imaging, aeromagnetic anomaly, compact inversion, conjugate gradient method, effective volume minimisation, magma reservoir, Otoge cauldron.
References
Bhattacharyya, B. K., 1964, Magnetic anomalies due to prism-shaped bodies with arbitrary polarization: Geophysics, 29, 517–531| Magnetic anomalies due to prism-shaped bodies with arbitrary polarization:Crossref | GoogleScholarGoogle Scholar |
Clark, D. A., 2013, New methods for interpretation of magnetic vector and gradient tensor data II: application to the Mount Leyshon anomaly, Queensland, Australia: Exploration Geophysics, 44, 114–127
| New methods for interpretation of magnetic vector and gradient tensor data II: application to the Mount Leyshon anomaly, Queensland, Australia:Crossref | GoogleScholarGoogle Scholar |
Geshi, N., 2003, Development of the Middle Miocene Otoge volcanic complex, Shitara district, central Japan: The Journal of the Geological Society of Japan, 109, 580–594
| Development of the Middle Miocene Otoge volcanic complex, Shitara district, central Japan:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3sXos1aru7g%3D&md5=9caafc0e1caca70d74c99fd4340b5877CAS |
Geshi, N., 2005, Structural development of dike swarms controlled by the change of magma supply rate: the cone sheets and parallel dike swarms of Miocene Otoge igneous complex, Central Japan: Journal of Volcanology and Geothermal Research, 141, 267–281
| Structural development of dike swarms controlled by the change of magma supply rate: the cone sheets and parallel dike swarms of Miocene Otoge igneous complex, Central Japan:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXitVajtrw%3D&md5=6988796d1f25692ce2ae9d2fd1643e42CAS |
Last, B. J., and Kubik, K., 1983, Compact gravity inversion: Geophysics, 48, 713–721
| Compact gravity inversion:Crossref | GoogleScholarGoogle Scholar |
Lelièvre, P. G., and Oldenburg, D. W., 2009, A 3D total magnetization inversion applicable when significant, complicated remanence is present: Geophysics, 74, L21–L30
| A 3D total magnetization inversion applicable when significant, complicated remanence is present:Crossref | GoogleScholarGoogle Scholar |
Li, Y., and Oldenburg, D. W., 1996, 3-D inversion of magnetic data: Geophysics, 61, 394–408
| 3-D inversion of magnetic data:Crossref | GoogleScholarGoogle Scholar |
Li, Y., Shearer, S. E., Haney, M. M., and Dannemiller, N., 2010, Comprehensive approaches to 3D inversion of magnetic data affected by remanent magnetization: Geophysics, 75, L1–L11
| Comprehensive approaches to 3D inversion of magnetic data affected by remanent magnetization:Crossref | GoogleScholarGoogle Scholar |
Makimoto, H., Yamada, N., Mizuno, K., Takada, A., Komazawa, M., and Sudo, S., 2004, Geological map of Japan 1 : 200,000, Toyohashi and Irago Misaki: Geological Survey of Japan, AIST.
Nakatsuka, T., 1995, Minimum norm inversion of magnetic anomalies with application to aeromagnetic data in the Tanna area, Central Japan: Journal of Geomagnetism and Geoelectricity, 47, 295–311
| Minimum norm inversion of magnetic anomalies with application to aeromagnetic data in the Tanna area, Central Japan:Crossref | GoogleScholarGoogle Scholar |
Nakatsuka, T., and Okuma, S., 2006a, Reduction of geomagnetic anomaly observations from helicopter surveys at varying elevations: Exploration Geophysics, 37, 121–128
| Reduction of geomagnetic anomaly observations from helicopter surveys at varying elevations:Crossref | GoogleScholarGoogle Scholar |
Nakatsuka, T., and Okuma, S., 2006b, Crossover analysis for the aeromagnetic survey at varying elevations, and its application to extracting temporal magnetic anomaly change: Butsuri-Tansa (Geophysical Exploration), 59, 449–458
| Crossover analysis for the aeromagnetic survey at varying elevations, and its application to extracting temporal magnetic anomaly change:Crossref | GoogleScholarGoogle Scholar |
Nakatsuka, T., Utsugi, M., Okuma, S., Tanaka, Y., and Hashimoto, T., 2009, Detection of aeromagnetic anomaly change associated with volcanic activity: an application of the generalized mis-tie control method: Tectonophysics, 478, 3–18
| Detection of aeromagnetic anomaly change associated with volcanic activity: an application of the generalized mis-tie control method:Crossref | GoogleScholarGoogle Scholar |
Okubo, A., Nakatsuka, T., Tanaka, Y., Kagiyama, T., and Utsugi, M., 2006, Aeromagnetic constraints on the subsurface structure of the Unzen Graben, Kyushu, Japan: Earth, Planets, and Space, 58, 23–31
Okuma, S., Makino, M., and Nakatsuka, T., 1994, Magnetization intensity mapping in and around Izu-Oshima Volcano, Japan: Journal of Geomagnetism and Geoelectricity, 46, 541–556
| Magnetization intensity mapping in and around Izu-Oshima Volcano, Japan:Crossref | GoogleScholarGoogle Scholar |
Okuma, S., Stotter, C., Supper, R., Nakatsuka, T., and Furukawa, R., 2009, Aeromagnetic constraints on the subsurface structure of Stromboli Volcano, Aeolian Islands, Italy: Tectonophysics, 478, 19–33
| Aeromagnetic constraints on the subsurface structure of Stromboli Volcano, Aeolian Islands, Italy:Crossref | GoogleScholarGoogle Scholar |
Pilkington, M., 1997, 3-D magnetic imaging using conjugate gradients: Geophysics, 62, 1132–1142
| 3-D magnetic imaging using conjugate gradients:Crossref | GoogleScholarGoogle Scholar |
Pilkington, M., 2009, 3-D magnetic data-space inversion with sparseness constraints: Geophysics, 74, L7–L15
| 3-D magnetic data-space inversion with sparseness constraints:Crossref | GoogleScholarGoogle Scholar |
Portniaguine, O., and Zhdanov, M. S., 1999, Focusing geophysical inversion images: Geophysics, 64, 874–887
| Focusing geophysical inversion images:Crossref | GoogleScholarGoogle Scholar |
Portniaguine, O., and Zhdanov, M. S., 2002, 3-D magnetic inversion with data compression and image focusing: Geophysics, 67, 1532–1541
| 3-D magnetic inversion with data compression and image focusing:Crossref | GoogleScholarGoogle Scholar |
Silva, J. B. C., Oliveira, F. S., Barbosa, V. C. F., and Campos Velho, H. F., 2007, Apparent-density mapping using entropic regularization: Geophysics, 72, I51–I60
| Apparent-density mapping using entropic regularization:Crossref | GoogleScholarGoogle Scholar |
Takada, A., 1987, Structure of a cauldron in the Otoge Ring Complex, Shitara district, Aichi Prefecture, central Japan: The Journal of the Geological Society of Japan, 93, 107–120
| Structure of a cauldron in the Otoge Ring Complex, Shitara district, Aichi Prefecture, central Japan:Crossref | GoogleScholarGoogle Scholar |
Uchida, T., 1993, Smooth 2-D inversion for magnetotelluric data based on statistical criterion ABIC: Journal of Geomagnetism and Geoelectricity, 45, 841–858
| Smooth 2-D inversion for magnetotelluric data based on statistical criterion ABIC:Crossref | GoogleScholarGoogle Scholar |