Ref: CTALK-2020-0111

Long-term monitoring with spring-based gravimeters: tilt-control benefits and application to the Rochefort Cave Laboratory (Belgium)

Fores, B. ; Watlet, A. ; Van Camp, M. ; Francis, O.

Talk presented at EGU, Vienna on 2020-05-08

Abstract: Spring-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.

Keyword(s): Spring gravimeter ; Drift ; Rochefort ; KARAG ; Hydrogeology ; Karst
Links: link

The record appears in these collections:
Conference Contributions & Seminars > Conference Talks > Contributed Talks
Royal Observatory of Belgium > Seismology & Gravimetry

 Record created 2020-03-10, last modified 2020-03-10