TY - JOUR
T1 - Separating climate-induced mass transfers and instrumental effects from tectonic signal in repeated absolute gravity measurements
AU - Van Camp, M.
AU - De Viron, O.
AU - Avouac, J. P.
PY - 2016/5/16
Y1 - 2016/5/16
N2 - We estimate the signature of the climate-induced mass transfers in repeated absolute gravity measurements based on satellite gravimetric measurements from the Gravity Recovery and Climate Experiment (GRACE) mission. We show results at the globe scale and compare them with repeated absolute gravity (AG) time behavior in three zones where AG surveys have been published: Northwestern Europe, Canada, and Tibet. For 10 yearly campaigns, the uncertainties affecting the determination of a linear gravity rate of change range 3-4 nm/s2/a in most cases, in the absence of instrumental artifacts. The results are consistent with what is observed for long-term repeated campaigns. We also discuss the possible artifact that can result from using short AG survey to determine the tectonic effects in a zone of high hydrological variability. We call into question the tectonic interpretation of several gravity changes reported from stations in Tibet, in particular the variation observed prior to the 2015 Gorkha earthquake.
AB - We estimate the signature of the climate-induced mass transfers in repeated absolute gravity measurements based on satellite gravimetric measurements from the Gravity Recovery and Climate Experiment (GRACE) mission. We show results at the globe scale and compare them with repeated absolute gravity (AG) time behavior in three zones where AG surveys have been published: Northwestern Europe, Canada, and Tibet. For 10 yearly campaigns, the uncertainties affecting the determination of a linear gravity rate of change range 3-4 nm/s2/a in most cases, in the absence of instrumental artifacts. The results are consistent with what is observed for long-term repeated campaigns. We also discuss the possible artifact that can result from using short AG survey to determine the tectonic effects in a zone of high hydrological variability. We call into question the tectonic interpretation of several gravity changes reported from stations in Tibet, in particular the variation observed prior to the 2015 Gorkha earthquake.
KW - absolute gravity measurements
KW - hydrological effects on gravity
KW - time-varying gravity
UR - http://www.scopus.com/inward/record.url?scp=84966333705&partnerID=8YFLogxK
U2 - 10.1002/2016GL068648
DO - 10.1002/2016GL068648
M3 - Article
AN - SCOPUS:84966333705
SN - 0094-8276
VL - 43
SP - 4313
EP - 4320
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 9
ER -