000005409 001__ 5409
000005409 005__ 20210726102601.0
000005409 0247_ $$2DOI$$a10.5194/se-12-1601-2021
000005409 037__ $$aSCART-2021-0111
000005409 100__ $$ade Viron, O.
000005409 245__ $$aComparing global seismic tomography models using varimax principal component analysis
000005409 260__ $$c2021
000005409 520__ $$aGlobal seismic tomography has greatly progressed in the past decades, with many global Earth models being produced by different research groups. Objective, statistical methods are crucial for the quantitative interpretation of the large amount of information encapsulated by the models and for unbiased model comparisons. Here we propose using a rotated version of principal component analysis (PCA) to compress the information in order to ease the geological interpretation and model comparison. The method generates between 7 and 15 principal components (PCs) for each of the seven tested global tomography models, capturing more than 97% of the total variance of the model. Each PC consists of a vertical profile, with which a horizontal pattern is associated by projection. The depth profiles and the horizontal patterns enable examining the key characteristics of the main components of the models. Most of the information in the models is associated with a few features: large low-shear velocity provinces (LLSVPs) in the lowermost mantle, subduction signals and low-velocity anomalies likely associated with mantle plumes in the upper and lower mantle, and ridges and cratons in the uppermost mantle. Importantly,all models highlight several independent components in the lower mantle that make between 36% and 69% of the total variance, depending on the model, which suggests that the lower mantle is more complex than traditionally assumed. Overall, we find that varimax PCA is a useful additional tool for the quantitative comparison and interpretation of tomography models.
000005409 536__ $$aCNES/$$cCNES/$$fCNES
000005409 594__ $$aNO
000005409 6531_ $$aVARIMAX-Principal component analysis
000005409 6531_ $$aTomography models
000005409 6531_ $$aSeismology
000005409 6531_ $$aEarth's mantle
000005409 700__ $$aVan Camp, M.
000005409 700__ $$aGrabokowiak, A.
000005409 700__ $$aFerreira, A.M.
000005409 773__ $$c1601-1634$$pSolid Earth$$v12$$y2021
000005409 8560_ $$fmichel.vancamp@observatoire.be
000005409 85642 $$ahttps://se.copernicus.org/articles/12/1601/2021/
000005409 905__ $$apublished in
000005409 980__ $$aREFERD