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Gravity Survey : Outline

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Gravity Survey

From the 2nd JARE (1957) to the 6th JARE (1961), relative gravity surveys in Antarctica were performed using Worden gravimeter and GSI pendulum developed by Geospatial Information Authority of Japan (formerly Geographical Survey Institute).
Relative gravity measurements have been taken at control points in ice-free areas for the purpose of identifying gravity anomalies since the 8th JARE (1966) using LaCoste gravimeters, and then Scintrex gravimeters from the 37th JARE (1995).
In 1991, a gravimeter room was established at Syowa station. Five absolute gravity measurements have been taken using Sakuma and FG5 gravimeters after the establishment of the IAGBN* gravity point there. These periodic surveys contribute to the construction of the international gravity network, as well as help in monitoring ice sheet and sea surface fluctuations, and detecting post-glacial rebound (uplift phenomenon caused by deglaciation).

* IAGBN: A resolution to construct the International Absolute Gravity Basestation Network was passed at the 19th IUGG/IAG meeting in 1987. The IAGBN is a network made up of points where absolute gravity measurements are taken. Points are divided into two types: A points that lie on stable continental areas; and B points that lie on areas with crustal activity. There are only two A points in Antarctica. One is at Syowa station, and the other is at McMurdo station.

International Absolute Gravity Basestation Network

Observing with FG5 absolute gravimeter (51st JARE)

Relative gravity measurement with the LaCoste gravimeter (51st JARE)

Data Format and Specification

Data Content

Gravity survey Data

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