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.
Highlights
Several geophysical investigations have been carried out to understand the physical characteristics beneath the continental ice-sheet on Mizuho Plateau, East Antarctica by the Japanese Antarctic Research Expedition (JARE)
The Mizuho Plateau is a part of the Paleozoic LützowHolm Complex (LHC), which is known as a region which experienced a metamorphic event in 550 Ma [1]
Land traverse gravity surveys were conducted for several times on the Plateau since 1961 [2,3,4,5]
Summary
Several geophysical investigations have been carried out to understand the physical characteristics beneath the continental ice-sheet on Mizuho Plateau, East Antarctica by the Japanese Antarctic Research Expedition (JARE). Dome-F routes was analyzed by the previously obtained gravity data [6]. In these previous studies, a station spacing of the gravity measurements was about a few km or larger, it requires that the station interval be more dense to address detail discussion about the fine structure. A multidisciplinary geosciences project on “Structure and Evolution of the East Antarctic Lithosphere (SEAL)” had been conducted in the Western Enderby Land— Eastern Dronning Maud Land in a framework of JARE [7,8]. As a main component of the SEAL project, the JARE-41 conducted deep seismic exploration (refraction and wide-angle reflection surveys), as well as the gravity measurements with a dense station distribution along the OPEN ACCESS
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