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Abstract:
The International Geodynamics and Earth Tide Services is one of the newer IAG services under the umbrella of the International Gravity Field Service (IGFS). Its primary objective is to support the monitoring of temporal gravity field variations at the Earth’s surface through long-term records from superconducting and mechanical gravimeters, tiltmeters and other geodynamic sensors.
Its main products are the raw and processed data from a worldwide set of superconducting gravimeters (SG), hosted at the main Data Center located at the German Research Centre for Geosciences (GFZ) in Potsdam (Germany).
We present here the status of IGETS, the data availability and the different data products:
- Level-1: raw gravity and pressure sampled at 1 or 2 seconds and filtered at 1 minute.
- Level-2: gravity and pressure data corrected for instrumental perturbations, ready for tidal analysis.
- Level-3: gravity residuals after geophysical corrections.
The University of French Polynesia (UPF) in Tahiti and the Ecole et Observatoire des Sciences de la Terre (EOST) in Strasbourg (France) are the two current Analysis Centers in charge of producing these higher order level data. While Level-1 products require special knowledge in data pre-processing, the Level-2 and -3 products are intended for analysis and interpretation.
In particular, level-2 products are dedicated to the analysis of Earth tides, while level-3 products directly allow further interpretation of small signals after the removal of known components, like water storage changes.
