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oai:doidb.wdc-terra.org:70142021-02-18T15:47:25ZDOIDBDOIDB.IGETS

false4DOIDB.IGETS 10.5880/igets.rc.l1.001 Van Camp, Michel Michel Van Camp 0000-0002-2859-3122 Royal Observatory of Belgium, Belgium Hendrickx, Marc Marc Hendrickx Royal Observatory of Belgium, Belgium Castelein, Stefaan Stefaan Castelein Royal Observatory of Belgium, Belgium Martin, Henri Henri Martin Royal Observatory of Belgium, Belgium GFZ Data Services 2021 Superconducting gravimetry Karst Hydrogeology Time-varying gravity Vadoze zone Saturated zone Superconducting gravimetry Earth tides Geodynamics EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY geodesy geophysics hydrology Van Camp, Michel Michel Van Camp 0000-0002-2859-3122 Royal Observatory of Belgium, Belgium Van Camp, Michel Michel Van Camp 0000-0002-2859-3122 Royal Observatory of Belgium, Belgium Hendrickx, Marc Marc Hendrickx Royal Observatory of Belgium, Belgium Castelein, Stefaan Stefaan Castelein Royal Observatory of Belgium, Belgium Martin, Henri Henri Martin Royal Observatory of Belgium, Belgium Voigt, Christian Christian Voigt 0000-0002-9988-965X GFZ German Research Centre for Geosciences, Potsdam, Germany Van Camp, Michel Royal Observatory of Belgium, Belgium 2014-12-15 Dataset 10.2312/GFZ.b103-16087 10.1002/2017RG000566 10.1029/2019WR026673 CC BY 4.0 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, 1997-2015) to provide support to geodetic and geophysical research activities using superconducting gravimeter (SG) data within the context of an international network.

In 2014 December the Royal Observatory of Belgium installed the iGrav #019 at the surface site of the Rochefort "Lorette" cave laboratory. The Lorette cave is one of several cavities that belong to the Wamme–Lomme karst system, a 10 km long karst area. At the surface of the site, a small and solid building, located at the border of a large sinkhole, hosts the gravity laboratory, which is thermally stabilized at ~25°C by a heater, excepted during a few days each summer when the temperature may increase above that level.

The iGrav #019 is installed directly on the bedrock (limestone) in a 1 m deep shaft. Two meters away from the iGrav there is a pillar of cement (60% sand, 40% cement, no iron nor stones) founded 1 meter deep on the bedrock and on which absolute gravity measurements are performed 10 times or more per year with the FG5#202 absolute gravimeter. See description in Fig A7 in Van Camp et al., 2017.

As this instrument was installed among others to investigate flash floods in the caves, it regularly monitors sudden changes in gravity reaching 50-100 nm/s², especially during the winter (Watlet et al., 2020). This should be considered when performing e.g. tidal analyses.
Raw gravity and atmospheric pressure from iGrav 019 - IGETS Level 1