The antisymmetric factor method for magnetic reduction to the pole at low latitudes |
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| Institution: | 1. Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education, Beijing 100083, China;2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia;2. Institut des Sciences de la Terre (ISTerre) Universite J. Fourier-CNRS Maison des Goscience, Grenoble Alpes CS 40700 38058 GRENOBLE Cedex 9;3. Moscow State University, Leninskie Gory GSP-1, Moscow, 119991, Russia;4. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;1. Research and Qualification Studies Division, Nuclear Research Center of Draria – Atomic Energy Commission, 43 Sebala, Draria, Algiers 16050, Algeria;2. Laboratory for Earth Physics, University M''Hamed Bougara of Boumerdes, Avenue de l''Indépendance, Boumerdes 35000, Algeria;1. Department of Earth Physics, Institute of Geophysics, University of Tehran, Iran;2. Department of Earth Sciences, Environment and Resources, University of Naples ‘Federico II’, Naples, Italy;1. Polish Academy of Sciences, Institute of Geological Sciences, Research Centre in Cracow, Senacka 1, 31-002 Kraków, Poland;2. Geological and Geophysical Institute of Hungary, Palaeomagnetic Laboratory, Columbus utca 17-23, H-1145, Budapest, Hungary;3. AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Al. Mickiewicza 30, 30-059 Kraków, Poland;4. Pedagogical University of Cracow, Institute of Geography, Podchor??ych 2, 30-084 Kraków, Poland |
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| Abstract: | We analyze the characteristics of the wavenumber-domain factor for magnetic reduction to the pole (RTP) at low latitudes, and then propose a new wavenumber-domain method for RTP at low latitudes, herein called the antisymmetric factor method, based on modification of the RTP factor. The method applies the antisymmetric factor in a given scope of directions centered along the magnetic declination to suppress amplification of the RTP factor, stabilizing the RTP. Meanwhile it utilizes the routine RTP factor in other directions to preserve the effective RTP features. The test on the synthetic data demonstrates that the method is robust and effective. Finally, we use the new method, as well as a variable magnetic inclinations algorithm, to perform RTP on the real data of total magnetic intensity anomalies in the South China Sea, and obtain the reliable RTP anomalies. |
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