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Gravity Survey on the Mizuho Plateau, East Antarctica: SEAL Seismic Exploration in 2001-2002
Department of Earth Sciences, Faculty of Education, Aichi University of Education, Kariya, Japan
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University, Kagoshima, Japan
National Institute of Polar Research, Tokyo, Japan
Shimabara Observatory, Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Shimabara, Japan
Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Sapporo, 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
- 1 Department of Earth Sciences, Faculty of Education, Aichi University of Education, Kariya, Japan
- 2 Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University, Kagoshima, Japan
- 3 National Institute of Polar Research, Tokyo, Japan
- 4 Shimabara Observatory, Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Shimabara, Japan
- 5 Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Sapporo, Japan
- 6 Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
- 7 Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
International Journal of Geosciences·Volume 05 (2014)·Pages 146–155·Published 25 February 2014·DOI10.4236/ijg.2014.52016
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Abstract
A gravity survey on Mizuho Plateau was carried out in austral summer of 2001-2002 by the 43 rd 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.
KeywordsGravity SurveyMizuho PlateauBedrock ElevationBouguer Gravity AnomalyCrustal Thickness
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