HR: 1340h
AN: G43B-1208    [Abstracts]
TI: Yearly gravity variations of superconducting gravimeter (GWR C039) at Ny-Å lesund compared to GPS data and hydrological model
AU: * Omang, O C
EM: ove.omang@statkart.no
AF: Norwegian Mapping Authority, Kartverksveien 21, Honefoss, 3511, Norway
AU: Kierulf, H P
EM: halfdan.kierulf@statkart.no
AF: Norwegian Mapping Authority, Kartverksveien 21, Honefoss, 3511, Norway
AB: Gravity data from the superconducting gravimeter (GWR C039) at Ny-Å lesund, Svalbard, Norway, have been analysed for long periodic variations. Prior to the analysis the gravity data was filtered and cleaned, by removing e.g. earthquakes and spikes. Any drift in the SCG data was removed using available absolute gravity measurements. Yearly variations in the gravity signal are visible after removal of short periodic tides, i.e. tides with period of approximately one month and shorter. The gravity station is co-located with 2 IGS-GPS stations. The GPS recievers are located within 5 m from the superconducting gravimeter. The variations in gravity data may be due to changes in the snow/water level. We investigated this effect by comparing to GPS data and global hydrological models. The effect of changes in the level of sediment deposits and glaciers are evaluated.
DE: 1217 Time variable gravity (7223, 7230)
DE: 1555 Time variations: diurnal to decadal
SC: Geodesy [G]
MN: 2007 Fall Meeting