Detection of sea floor structures off the Gunnerus ridge

概要

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We produced a new gravity anomaly image around Antarctica to derive detailed sea floor information from 10 Hz sampled satellite altimetry data. From the obtained gravity image, we extracted linear features, by applying a combination of binarization, clustering and thinning techniques. In the South Indian Ocean, we recognized several lineaments located off the Gunnerus ridge. We also extracted a feature running in the middle of these lineaments and assume it to be a fossil ridge. These features suggest that the direction of spreading changed during the early stage of sea floor spreading between Antarctica and India. We applied the same image processing techniques to the gravity images processed by high-cut filtering, but the ridge-like feature can not be detected from these images. Differences between processed results indicate that the gravity images obtained in our work preserve more detailed information at short wavelength.
国立極地研究所の論文