000004853 001__ 4853
000004853 005__ 20200310080428.0
000004853 037__ $$aCTALK-2020-0111
000004853 100__ $$aFores, B.
000004853 245__ $$aLong-term monitoring with spring-based gravimeters: tilt-control benefits and application to the Rochefort Cave Laboratory (Belgium)
000004853 260__ $$c2020
000004853 269__ $$c2020-05-08
000004853 520__ $$aSpring-based gravimeters are light and easy to install, with a precision around 5 μGal/√Hz. However, they are still not used for long-term gravity monitoring. The main reason for that is the non-linear drift of those instruments, which is very difficult to correct without removing geophysical signals. We will show that when the tilt is actively controlled, a gPhone spring-based gravimeter shows a quasi-linear drift and can reach a long-term stability at the µGal level. This allows experiments such as the one in the Rochefort Cave Laboratory (Belgium). Thanks to the size of the gPhone and its low facility requirements, a monitoring from inside a cave was possible. Coupled with another gravity monitoring at the surface, it reveals new information on the local hydrology of this karstic site.
000004853 594__ $$aNO
000004853 6531_ $$aSpring gravimeter 
000004853 6531_ $$aDrift
000004853 6531_ $$aRochefort
000004853 6531_ $$aKARAG
000004853 6531_ $$aHydrogeology
000004853 6531_ $$aKarst
000004853 700__ $$aWatlet, A. 
000004853 700__ $$aVan Camp, M. 
000004853 700__ $$aFrancis, O.
000004853 773__ $$tEGU, Vienna
000004853 8560_ $$fmichel.vancamp@observatoire.be
000004853 85642 $$ahttps://meetingorganizer.copernicus.org/EGU2020/orals/35340
000004853 906__ $$aContributed
000004853 980__ $$aCTALKCONT