Gravity Survey on the Mizuho Plateau, East Antarctica: SEAL Seismic Exploration in 2001-2002
Shigeru Toda, Hiroki Miyamachi, Masaki Kanao, Takeshi Matsushima, Masamitsu Takada, Atsushi Watanabe, Mikiya Yamashita
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University, Kagoshima, Japan.
Department of Earth Sciences, Faculty of Education, Aichi University of Education, Kariya, Japan.
Earthquake Research Institute, The University of Tokyo, Tokyo, Japan.
Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan.
Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Sapporo, Japan.
National Institute of Polar Research, Tokyo, Japan.
Shimabara Observatory, Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Shimabara, Japan.
DOI: 10.4236/ijg.2014.52016   PDF   HTML   XML   3,497 Downloads   4,941 Views   Citations

Abstract

A gravity survey on Mizuho Plateau was carried out in austral summer of 2001-2002 by the 43rd Japanese Antarctic Research Expedition (JARE-43), as one of the geophysical measurements of deep seismic exploration. Gravity measurements were conducted at 151 points in approximately 1 km interval along the 150 km profile. Considering the gravity effect from the ice-sheet, Free-air and Bouguer anomalies were calculated by using precise GPS locations. Furrowed and basin-like negative Free-air anomalies were observed in middle and northern parts of the profile. Bouguer anomalies were calculated by two bedrock elevation data obtained from seismic refraction and radio-echo sounding. High resolution model for bedrock elevation by radio-echo sounding was applied in determining the crustal thickness.

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Toda, S. , Miyamachi, H. , Kanao, M. , Matsushima, T. , Takada, M. , Watanabe, A. and Yamashita, M. (2014) Gravity Survey on the Mizuho Plateau, East Antarctica: SEAL Seismic Exploration in 2001-2002. International Journal of Geosciences, 5, 146-155. doi: 10.4236/ijg.2014.52016.

Conflicts of Interest

The authors declare no conflicts of interest.

References

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