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Swell Noise Attenuation Using a Cascade of F-X Filter and Median Filter

F-X 필터와 중앙값 필터를 연속적으로 사용한 파랑잡음 제거

  • 김수관 (한국해양과학기술원 부설 극지연구소) ;
  • 홍종국 (한국해양과학기술원 부설 극지연구소)
  • Received : 2012.10.22
  • Accepted : 2012.11.24
  • Published : 2012.11.30

Abstract

High-amplitude swell noises (HASN) are very difficult to eliminate from the marine seismic data. In this paper, we applied F-X filter and median filter in order to suppress HASN. Test data have been acquired on the northern offshore of the South Shetland Islands in December, 2010. Parts of data have been contaminated by HASN caused by bad weather during the cruise. We applied F-X filter and median filter to test data with HASN. After F-X filtering, most of non-coherent noises and small-amplitude swell noises are eliminated effectively but HASN are still remained significantly. With median filter, HASN was suppressed better than F-X filter, however some of non-coherent noises are still remains. We applied a cascade of two filters and results show HASN and non-coherent noises are suppressed effectively. After the cascade of two filtering, it is possible to define reflection layers clearly on the velocity spectrum and to produce better stacked section with a good signal-to-noise ratio.

Acknowledgement

Grant : 양극해 해양환경변화와 활용연구, 장보고 과학기지 주변 빙권과 지각권의 상호작용 규명: David Glacier 종합 관측망 구축 및 빙하의 진화연구

Supported by : 국토해양부, 극지연구소

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