DOI: 10.1016/j.jag.2014.04.002
Scopus记录号: 2-s2.0-84924405373
论文题名: GEMMA: An Earth crustal model based on GOCE satellite data
作者: Reguzzoni M ; , Sampietro D
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2015
卷: 35, 期: PA 起始页码: 31
结束页码: 43
语种: 英语
英文关键词: Earth crustal model
; Global Moho model
; GOCE satellite
; Inverse gravimetric problem
Scopus关键词: crustal structure
; GOCE
; gravimetry
; gravity field
; inverse problem
; Moho
; numerical model
; satellite data
; upper mantle
英文摘要: The boundary between Earth's crust and mantle is commonly modelled as a discontinuity surface, theso-called Moho. Although in some regions of the world this model may be too approximate or evenunrealistic, globally speaking it can provide a key to read several long wavelength geophysical signals. Recent research activities have shown the possibility to estimate the Moho discontinuity worldwide from global gravity field model, however usually the solution of this inverse problem requires strong unrealistic hypotheses. In this work a new procedure to relax some of these unrealistic hypotheses is devised and described indetails. Basically it allows to estimate the mean Moho depth even once the normal gravitational field isremoved if at least one seismic observation is available, to take into account the dependency of the crust density on the radial direction (usually neglected in Moho depth determination from gravity), to correctthe a-priori density model of the crystalline crust for scale factors again using seismic information andfinally to consider a Moho with a non-constant depth as reference surface in the inversion, thus reducing the linearization error. The new procedure is here applied to GOCE data to estimate a new crustal model. For this purpose additional external information has been used, such as topography, bathymetry and ice sheet modelsfrom ETOPO1, a recent 1° × 1° sediment global model and some prior hypotheses on crustal density. Inparticular the main geological provinces, each of them characterized by its own relation between densityand depth, have been considered. A model describing lateral density variations of the upper mantle isalso taken into account.The new crustal model is computed at a spatial resolution of 0.5°× 0.5°, its gravitational effect differs from GOCE observations of 49 mE and its Moho depth error standard deviation is globally of 3.4 km. Therefore the result seems to be an improvement in terms of resolution, consistency with the gravity field and accuracy not only with respect to previously released GEMMA models, but also with respect tothe current state-of-the-art global knowledge of the Earth crust. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79617
Appears in Collections: 气候变化事实与影响
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作者单位: DICA - Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy; GReD s.r.l., Via Valleggio 11, Como, Italy
Recommended Citation:
Reguzzoni M,, Sampietro D. GEMMA: An Earth crustal model based on GOCE satellite data[J]. International Journal of Applied Earth Observation and Geoinformation,2015-01-01,35(PA)