Denoising the Total Magnetic Intensity Data in the Ocean Basin of the South China Sea by Using Various Filtering Techniques

Abstract

Total magnetic intensity (TMI) data is an important data for understanding the seafloor spreading of the South China Sea. In this paper, we studied to denoise the TMI data in the ocean subbasin of the SCS by using various filtering techniques. Based on the noise features occured in the data, we utilize the directional filter to reject noise of NS direction, and then apply the anisotropic diffusion filter to further elliminate the bead-like artifacts. The denoised result presents a well conherence of magnetic lineations in the ocean basin. The magnetic lineaments trend to nearly EW in the eastern subbasin while NE in southwestern subbasin. The intensity of the magnetic lineaments in the eastern subbasin is stronger than that in the southwestern subbasin.