000005855 001__ 5855
000005855 005__ 20221019155533.0
000005855 0247_ $$2DOI$$a10.1093/gji/ggac415
000005855 037__ $$aSCART-2022-0100
000005855 100__ $$aVan Camp, M.
000005855 245__ $$aA naive Bayesian method to chase mantle plumes in global tomography models
000005855 260__ $$c2022
000005855 520__ $$aThis study provides a quantitative approach to search for mantle plumes in global seismic tomography models without any preconceived notions about the associated mantle velocity anomalies, other than the assumption that the plumes are not significantly deflected horizontally by more than 6°, anywhere in the mantle. We design identification tests with a reasonable detection threshold while keeping false alarms at a level lower than 5%. This is based on a naive Bayesian clustering analysis, which is possible thanks to the varimax principal component analysis that provides components of the tomography models that are much more independent than the original number of depth slices in the models. We find that using such independent components greatly reduces detection errors compared to using an arbitrary number of depth slices due to correlations between the different slices. We detect a wide range of behaviour of the seismic velocity profiles underneath the hotspots investigated in this study. Moreover, we retrieve locations away from hotspots that have similar seismic velocity profile signatures to those underneath some hotspots. Hence, it is not possible to obtain a unique definition of seismic velocity anomalies that are associated with hotspots and thus care needs to be taken when searching for mantle plumes beneath hotspots using prior assumptions about the velocity anomalies that might be associated with them. On the other hand, we establish a probability distribution of the seismic velocity profiles that is specific to a sub-list of hotspots. Overall, the mantle plume zones identified in our analysis do not appear to surround the Africa and Pacific large low shear velocity provinces (LLSVPs), but are rather within them. This rules out the idea that LLSVPs correspond to compact, dense piles with mantle plumes rising from their edges. Instead, our analysis suggests two possible options that either the LLSVPs: (1) correspond to bundles of thermochemical mantle plumes; or (2) are made up of compact piles topped by a bundle of plumes.
000005855 536__ $$aCNES/$$cCNES/$$fCNES
000005855 594__ $$aNO
000005855 6531_ $$aComposition and structure of the mantle
000005855 6531_ $$aHotspots
000005855 6531_ $$aSeismic tomography
000005855 6531_ $$aStatistical methods
000005855 700__ $$ade Viron, O.
000005855 700__ $$aFerreira, A.M.G.
000005855 700__ $$aVerhoeven, O.
000005855 773__ $$pGeophysical Journal International$$y2022
000005855 8560_ $$fmichel.vancamp@observatoire.be
000005855 85642 $$ahttps://doi.org/10.1093/gji/ggac415
000005855 905__ $$ain press to
000005855 980__ $$aREFERD