Publications related to the GRACE Missions (no abstracts)

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Detection and characterization of Earth's interior signals in geodetic data using blind source separation methods

de Viron, Olivier, Van Camp, Michel, and Sidére, Nicolas, 2026. Detection and characterization of Earth's interior signals in geodetic data using blind source separation methods. Geophysical Journal International, .

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@ARTICLE{2026GeoJI.tmp..603D,
       author = {{de Viron}, Olivier and {Van Camp}, Michel and {Sid{\'e}re}, Nicolas},
        title = "{Detection and characterization of Earth's interior signals in geodetic data using blind source separation methods}",
      journal = {Geophysical Journal International},
         year = 2026,
        month = aug,
     abstract = "{We assess the potential of blind source separation (BSS) methods to
        recover signals originating from Earth's interior, using
        synthetic tests and satellite gravimetry data. Seven BSS methods
        are evaluated in terms of their ability to detect and
        characterize low-amplitude interior signals embedded in dominant
        noise and climate-induced variability. Our results show that
        detection is generally feasible even when interior signals have
        small relative amplitudes; in this context, classical Principal
        Component Analysis (PCA) provides the most reliable detection
        performance. However, detailed characterization of the spatial
        and temporal structure of the interior signal proves more
        challenging. Independent Component Analysis (ICA) offers
        improved characterization compared to other methods, but only
        when the interior signal's variability is comparable to that of
        climate signals. We then apply a two-step screening process to
        GRACE satellite gravity data. First, PCA is applied
        independently at each grid point across Earth's surface,
        successfully retrieving major climate signals previously
        identified in the literature. Second, we use PCA on an
        earthquake catalog spanning the GRACE observation period and
        find that earthquakes with magnitudes below 8.5 can be detected.
        However, the correlation between the retrieved components and
        earthquake-induced gravity signals remains too weak to support
        meaningful geophysical interpretation. These results highlight
        both the promise and the current limitations of BSS methods for
        investigating Earth's internal processes using space-based
        gravimetry.}",
          doi = {10.1093/gji/ggag325},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2026GeoJI.tmp..603D},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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