Study on the Significance of Reduction to the Equator (RTE), Reduction to the Pole (RTP), and Pseudogravity in Magnetic Data Interpretation
DOI:
10.29303/jppipa.v9i8.4705Published:
2023-08-25Issue:
Vol. 9 No. 8 (2023): AugustKeywords:
Magnetic anomaly, Pseudogravity, Reduce to equator, Reduce to poleResearch Articles
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Abstract
Interpretation of geomagnetic anomaly data is challenging, due to the influence of the Earth's dipole magnetic field. In this study, we investigate the significance of employing methods to transform dipole anomalies into monopoles, aiming to enhance the interpretability of the data. Four methods were examined: Reduce to Pole (RTP), Reduce to Equator (RTE), and Pseudo-Gravity. The RTP method was implemented using general equations for RTP, Pseudo-inclination (PI), and Nonlinear thresholding (NTRTP). The computation programs for RTP and RTE were developed using the Matlab programming language. Synthetic models were constructed to investigate the effects of inclination values, object dimensions, and positions on the resulting magnetic anomaly response. The result shows that NTRTP methods give the best result with coefficient correlation >0.9. It can be used in every condition (low or high inclination). The implementation was conducted utilizing magnetic data in the Gunung Pandan geothermal area. The application of the reduced to the pole (RTP) technique on the field data successfully remove the dipole effects, and make interpretation process easier. Based on RTP map, the range of anomaly values spanning from -800 nT to 1000 nT. High anomalies were observed at the Gunung Pandan site, indicative of a probable intrusion of andesitic igneous rock.
References
Aji, W., Wahyudi, E. J., Santoso, D., & Kadir, W. G. A. (2018). 3-D Inversion Model of Gravity Data using Iterative Calculation on Mt. Pandan, East Java, Indonesia. J Geofis, 16, 27–33. https://doi.org/ 10. 36435/jgf. v16i3. 388
Alawiyah, S., Kadir, W. G. A., Santoso, D., Wahyudi, E. J., Aji, W., & Gunawan, I. (2022). Modeling of Subsurface Structure by Using Magnetic Methods in the Area of Mt. Pandan, Indonesia. Arabian Journal of Geosciences, 15(15), 1330. https://doi.org/10.1007/s12517-022-10599-0
Baranov, V. (1957). A New Method for Interpretation of Aeromagnetic Maps, Pseudo-Gravimetric Anomalies. Geophysics, 22, 359-363. http://dx.doi.org/10.1190/1.1438369
Barka, J. (2020). Pseudo-Gravity Interpretation of High-Resolution Aeromagnetic Data Over Northern Bida Basin and Environs, North-Central Nigeria: Implication for Mineral Exploration. Science World Journal, 15(3), 67-72. https://doi.org/10.47514/swj/15.03.2020.009
Bhattacharyya, B. K. (1965). Two-Dimensional Harmonic Analysis as a Tool for Magnetic Interpretation. Geophysics, 30(5), 829-857. https://doi.org/10.1190/1.1439658
Blakely, R. J. (1995). Potential Theory in Gravity and Magnetic Applications. Cambridge: Cambridge university press.
Fedi, M. (1989). On the Quantitative Interpretation of the Magnetic Anomalies by Pseudogravimetric Integration. Terra Nova, 1(6), 564–572. http://dx.doi.org/10.1111/j.1365-3121.1989.tb00433.x.
Gerovska, D., Aráuzo-Bravo, M. J., & Stavrev, P. (2009). Estimating the Magnetization Direction of Sources from Southeast Bulgaria through Correlation between Reduced-Tothe-Pole and Total Magnitude Anomalies. Geophysical Prospecting, 57(4), 491—505. https://doi.org/10.1111/j.1365-2478.2008.00761.x
Guo, L., Shi, L., & Meng, X. (2013). The Antisymmetric Factor Method for Magnetic Reduction to the Pole at Low Latitudes. Journal of Applied Geophysics, 92, 103-109. https://doi.org/10.1016/j.jappgeo.2013.02.018
Hansen, R. O., & Pawlowski, R. S. (1989). Reduction to the Pole at Low Latitudes by Wiener Filtering. Geophysics, 54(12), 1607-1613. https://doi.org/10.1190/1.1442628
Hao, M., Zhang, F., Tai, Z., Du, W., Ren, L., & Li, Y. (2018). Reduction to the Pole at Low Latitudes by using the Taylor Series Iterative Method. Journal of Applied Geophysics, 159, 127-134. https://doi.org/10.1016/j.jappgeo.2018.08.004
Keating, P., & Zerbo, L. (1996). An Improved Technique for Reduction to the Pole at Low Latitudes. Geophysics, 61(1), 131–137. https://doi.org/10.1190/1.1443933
Li, X. (2008). Magnetic Reduction-to-the-Pole at Low Latitudes: Observations and Considerations. The Leading Edge, 27(8), 990–1002. https://doi.org/10.1190/1.2967550
MacLeod, I. N., Jones, K., & Dai, T. F. (1993). 3-D Analytic Signal in the Interpretation of Total Magnetic Field Data at Low Magnetic Latitudes. Exploration Geophysics, 24(4), 679-688. https://doi.org/10.1071/EG993679
Mashhadi, S. R., & Safari, M. (2020). The Effectiveness of Pseudo-Gravity Transformation in Mineral Exploration: An Example from a Placer Magnetite Deposit. In NSG2020 3rd Conference on Geophysics for Mineral Exploration and Mining, 2020(1), 1-5). https://doi.org/10.3997/2214-4609.202020015
Mendonça, C. A., & Silva, J. B. C. (1993). A stable truncated series approximation of the reduction-to-the-pole operator. Geophysics, 58(8), 1084-1090. https://doi.org/10.1190/1.1443492
Nabighian, M. .N. (1972). The Analytic signal of Two Dimensional Magnetic Bodies with Polygonal Cross Section, Its Properties and Use for Automated Anomaly Interpretation. Geophysics 37, 507-212. http://dx.doi.org/10.1190/1.1440276
Panepinto, S., Luca, L. D., Mantovani, M., Sfolciaghi, M., & Garcea, B. (2014). Using the Pseudo-Gravity Functional Transform to Enhance Deep-Magnetic Sources and Enrich Regional Gravity Data. Seg Technical Program Expanded Abstracts. https://doi.org/10.1190/segam2014-1323.1
Pratt, D. A., & Shi, Z. (2004). An Improved Pseudogravity Magnetic Transform Technique for Investigation of Deep Magnetic Source Rocks. ASEG Extended Abstracts, 1, 1-4. https://doi.org/10.1071/ASEG2004ab116
Pringgoprawiro, H., & Sukido, S. (1992). Peta Geologi Lembar Bojonegoro, Jawa Timur. Bandung: Pusat Penelitian dan Pengembangan Geologi.
Santoso, D., Wahyudi, E. J., Kadir, W. G. A., Alawiyah, S., Nugraha, A. D., Supendi, P., & Parnadi, W. W. (2018). Gravity Structure Around Mt.Pandan, Madiun, East Java, Indonesia and Its Relationship to 2016 Seismic Activity. Open Geosci, 10, 882–888. https:// doi. org/10. 1515/ geo- 2018- 0069
Setijadji, L. D. (2010). Segmented Volcanic Arc and Its Association with Geothermal Fields in Java Island. Proceeding World Geothermal Congress. Bali, Indonesia, 1-12. Retrieved from https://www.geothermal-energy.org/pdf/IGAstandard/WGC/2010/1275.pdf
Shi, L., Guo, L. H., Meng, X. H., & Wang, Y. F. (2012). The Modified Pseudo Inclination Method for Magnetic Reduction to the Pole at Low Latitudes. Chinese Journal of Geophysics, 55(5), 1775-1783. https://doi.org/10.6038/j.issn.0001-5733.2012.05.035
Shuey R. T. (1972). Application of Transformasi Hilberts to Magnetic Profiles. Geophysics, 37(6), 1043-1045. https://doi.org/10.1190/1.1440313
Silva, J. B. (1986). Reduction to the pole as an inverse problem and its application to low-latitude anomalies. Geophysics, 51(2), 369-382. Retrieved from https://www.u-cursos.cl/ingenieria/2010/1/GF700/1/material_docente/bajar?id_material=292982
Smyth, H. R., Hall, R., & Nichols, G. J. (2008). Cenozoic Volcanic Arc History of East Java, Indonesia: The Stratigraphic Record of Eruptions on an Active Continental Margin. Spec Pap Geol Soc Am, 436, 199. https:// doi. org/ 10. 1130/ 2008. 2436(10)
Thoha, M., Parman, P., Prastistho, B., Yudiantoro, D. F., Hati, I. P., & Jagranata, I. B. (2014). Geology and Geothermal Manifestations of Mount Pandan, East Java. In Proceedings 3rd international ITB geothermal workshop. Bandung, Indonesia. Retrieved from https://www.researchgate.net/publication/317338998
van Bemmelen, R. W. (1949). The Geology of Indonesia. Den Haag: Government Printing Office, The Hague. Retrieved from https://www.worldcat.org/title/geology-of-indonesia/oclc/624477880
Zhang, H., Marangoni, Y. R., Hu, X., & Zuo, R. (2014). NTRTP: A New Reduction to the Pole Method at Low Latitudes Via a Nonlinear Thresholding. Journal of Applied Geophysics, 111, 220-227. Retrieved from https://repositorio.usp.br/bitstream/handle/BDPI/47644/J.%20of%20Ap.%20Geop.%20v.%20111.pdf?sequence=1&isAllowed=y
Zuo, B., Hu, X., Leão-Santos, M., Cai, Y., Kass, M. A., Wang, L., & Liu, S. (2021). Low-Latitude Reduction-to-the-Pole and Upward Continuation between Arbitrary Surfaces based on the Partial Differential Equation Framework. Geophysical Journal International, 226(2), 968-983. https://doi.org/10.1093/gji/ggab067
Author Biographies
Mira Nailufar Rusman, Institut Teknologi Bandung
Susanti Alawiyah, Institut Teknologi Bandung
Indra Gunawan, Institut Teknologi Bandung
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Copyright (c) 2023 Mira Nailufar Rusman, Susanti Alawiyah, Indra Gunawan
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