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Analyse: Consacré aux monuments de la ville de Neuchâtel.

Knowledge about the Earth's deep structures comes mainly from seismic tomography. Of course, other sources of information are available to better understand the deep Earth's interior such as magnetism, geodesy or geochemistry. For several years, seismic tomography steadily improved, by both new developments in theory and new data. In this study, we will present the first unbiased tomographic images of the mantle obtained through a rejuvenated Backus-Gilbert joint inversion of two different data sets: finite-frequency shear-wave time-residuals and normal modes data. The Backus-Gilbert inversion scheme allows to interpret quantitatively the unbiased multi-resolution images. The Backus-Gilbert inversion allows to obtain unbiased model estimates and the associated appraisal (resolution and uncertainties). For the first time, a joint Backus-Gilbert tomography is delivered to the community with its associated appraisal. In the last part we show how we can quantitatively interpret a complex geodynamical structure inside the mantle.