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Separating climate-induced mass transfers and instrumental effects from tectonic signal in repeated absolute gravity measurements

Van Camp, M. and de Viron, O. and Avouac, J. P. (2016) Separating climate-induced mass transfers and instrumental effects from tectonic signal in repeated absolute gravity measurements. Geophysical Research Letters, 43 (9). pp. 4313-4320. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20160715-080315862

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Abstract

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/s^2/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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2016GL068648DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2016GL068648/abstractPublisherArticle
ORCID:
AuthorORCID
Avouac, J. P.0000-0002-3060-8442
Additional Information:© 2016 American Geophysical Union. Received 11 MAR 2016; Accepted 19 APR 2016; Accepted article online 20 APR 2016; Published online 7 MAY 2016. The data used in the references, tables, supplements, and repository at http://podaac.jpl.nasa.gov/dataset/TELLUS_GRACE_MASCON_CRI_GRID_RL05_V1. We thank Reinhard Falk (BKG) and Michal Mikolaj (GFZ Potsdam), two anonymous reviewers, and the Editor Andrew Newman for fruitful discussions. The work of OdV was supported by the Institut Universitaire de France and by the CNES as an exploitation of the GRACE space gravity mission.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Institut Universitaire de France (IUF)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:absolute gravity measurements; hydrological effects on gravity; time-varying gravity
Record Number:CaltechAUTHORS:20160715-080315862
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160715-080315862
Official Citation:Van Camp, M., O. de Viron, and J. P. Avouac (2016), Separating climate-induced mass transfers and instrumental effects from tectonic signal in repeated absolute gravity measurements, Geophys. Res. Lett., 43, 4313–4320, doi:10.1002/2016GL068648.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69043
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Jul 2016 21:23
Last Modified:06 Dec 2016 23:03

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