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• W2895957570 abstract "Abstract Gravimetry is a well-established tool to probe the deep Earth’s processes. Geophysical signals coming from the deep Earth, like the inner core free oscillations, have however never been detected. Challenging quests raise the question of the limits of detection of elusive signals at the Earth’s surface. Knowledge of the instrumental limits and of the environmental noise level at a site is fundamental to judge the true sensitivity of an instrument. We perform a noise level comparison of various gravimeters and a long-period seismometer at the J9 gravimetric observatory of Strasbourg (France) to provide a reference of instrumental performances. We then apply a three-channel correlation analysis of time-varying surface gravity from superconducting gravimeter records to isolate the instrumental self-noise from the environmental noise. The self-noise coherence analysis shows that the instrumental noise level remains flat towards lower frequencies till 10 −4 Hz. At seismic frequencies, the self-noise is well explained by a Brownian thermal noise model. At daily and sub-daily time-scales, self-noise is increasing with the period but to a much lesser extent than observed noise level. Observed Earth’s ambient noise level at sub-seismic frequencies is hence mostly due to unmodeled geophysical processes. At hourly time-scales, our ability to detect elusive signals coming from the deep Earth’s interior is not limited by the instrument capability but is mostly due to the environmental effects." @default.
• W2895957570 created "2018-10-26" @default.
• W2895957570 creator A5072665303 @default.
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• W2895957570 date "2018-10-17" @default.
• W2895957570 modified "2023-10-13" @default.
• W2895957570 title "Limits of Detection of Gravimetric Signals on Earth" @default.
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• W2895957570 doi "https://doi.org/10.1038/s41598-018-33717-z" @default.
• W2895957570 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6193024" @default.
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• W2895957570 hasPublicationYear "2018" @default.
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