Released
Dataset

Superconducting Gravimeter Data from Sutherland - Level 1

Cite as:

Förste, Christoph; Voigt, Christian; Abe, Maiko; Kroner, Corinna; Neumeyer, Jürgen; Pflug, Hartmut; Fourie, Piet (2016): Superconducting Gravimeter Data from Sutherland - Level 1. V. 001. GFZ Data Services. https://doi.org/10.5880/igets.su.l1.001

Status

I   N       R   E   V   I   E   W : Förste, Christoph; Voigt, Christian; Abe, Maiko; Kroner, Corinna; Neumeyer, Jürgen; Pflug, Hartmut; Fourie, Piet (2016): Superconducting Gravimeter Data from Sutherland - Level 1. V. 001. GFZ Data Services. https://doi.org/10.5880/igets.su.l1.001

Abstract

The International Geodynamics and Earth Tide Service (IGETS) was established in 2015 by the International Association of Geodesy IAG. IGETS continues the activities of the Global Geodynamics Project (GGP) between 1997 and 2015 to provide support to geodetic and geophysical research activities using superconducting gravimeter (SG) data within the context of an international network. As part of this network, the South African Geodynamic Observatory Sutherland (SAGOS) was established by the GFZ German Research Centre for Geosciences during the years 1998 and 2000 based on an Agreement on Cooperative Activities between the National Research Foundation (NRF) and GFZ signed in August 1998. Continuous time-varying gravity and atmospheric pressure data from the SGs at SAGOS are integrated in the IGETS data base hosted by GFZ.


The SAGOS observatory is located at the site of the South African Astronomical Observatory (SAAO) approximately 350 km northeast of Cape Town (longitude: 20.81 E, latitude: 32.38 S, height above MSL: 1755 m). The operation and maintenance of the SAGOS instrumentation is jointly done by staff of SAAO and GFZ. The shortest distance to the South Atlantic coastline is approximately 200 km. The area is located in a tectonically quiet zone far away from the African rift. Geologically, the setting is a huge dolerite plateau with a several kilometres thick layer of dolerite. This bedrock allows a good coupling of the SG pillars to the ground. The environment is a remote area with no industry and low seismicity. The climate at this place is determined by the border between summer and winter rainfall zones so that temperature fluctuations are not too rough. The observatory is built into the ground to protect it against environmental effects like strong winds and temperature changes. All rooms are thermally insulated. An air-conditioning system controls the temperature inside the measurement chamber, which is equipped with three concrete pillars embedded into the dolerite bedrock. Two of the pillars are constructed for SGs or other geophysical instruments. The third pillar is dedicated for absolute gravimeters for the calibration of the SGs. In the vicinity of the observatory four further pillars were set up for various other geodetic antennas and instrumentation.


SAGOS is a high precision geodynamic observatory comprising space techniques and ground instruments. Presently, the observatory is equipped with one SG manufactured by GWR Instruments (SG D037). The second SG operating in parallel until September 2017 was installed at mountain Zugspitze in September 2018 (Voigt et al. 2019, http://doi.org/10.5880/igets.zu.l1.001). The time series of gravity and barometric pressure from the dual sensor gravimeter SG D037 starts in February 2000 and is interrupted from July 2008 to November 2009 due to an upgrade of the electronics package. The time series of SG 052 begins in August 2008 and ends in September 2017 without interruption. The SG D037 is active and the time series is kept up to date regularly with a time delay of a few months. The time sampling of the raw gravity and barometric pressure data of IGETS Level 1 is 1 minute. Starting in January 2016, raw data with a time sampling of 1 second is provided additionally. For a detailed description of the IGETS data base and the provided files see Voigt et al. (2016, http://doi.org/10.2312/GFZ.b103-16087).


In addition, SAGOS is equipped with auxiliary data supporting the interpretation of the SG measurements, which is, however, not provided in the IGETS data base due to their complexity. These are a local network of hydrological and meteorological sensors as well as a permanent GNSS (Global Navigation Satellite Systems) station as a core station of the International GNSS Service (IGS) with the ID SUTM.

Authors

  • Förste, Christoph;GFZ German Research Centre for Geosciences, Potsdam, Germany
  • Voigt, Christian;GFZ German Research Centre for Geosciences, Potsdam, Germany
  • Abe, Maiko;GFZ German Research Centre for Geosciences, Potsdam, Germany
  • Kroner, Corinna;PTB Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
  • Neumeyer, Jürgen;GFZ German Research Centre for Geosciences, Potsdam, Germany (retired)
  • Pflug, Hartmut;GFZ German Research Centre for Geosciences, Potsdam, Germany
  • Fourie, Piet;South African Astronomical Observatory, Sutherland, South Africa

Contact

  • Voigt, Christian (Research Scientist) ; GFZ German Research Centre for Geosciences, Potsdam, Germany;

Keywords

Superconducting gravimetry, Earth tides, Geodynamics, IGETS, International Geodynamics and Earth Tide Service, geodesy, geophysics, hydrology

GCMD Science Keywords

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