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        A gravimetric method to determine horizontal stress field due to flow in the mantle in Fennoscandia

        Nureldin A.A. Gido,Mohammad Bagherbandi,Lars E. Sjöberg 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.3

        Mass changes and flow in the Earth’s mantle causes the Earth’s crust not only to move vertically, but also horizontally and to tilt, and produce a major stress in the lithosphere. Here we use a gravimetric approach to model sub-lithosphere horizontal stress in the Earth’s mantle and its temporal changes caused by geodynamical movements like mantle convection in Fennoscandia. The flow in the mantle is inferred from tectonics and convection currents carrying heat from the interior of the Earth to the crust. The result is useful in studying how changes of the stress influence the stability of crust. The outcome of this study is an alternative approach to studying the stress and its change using forward modelling and the Earth’s viscoelastic models. We show that the determined horizontal stress using a gravimetric method is consistent with tectonics and seismic activities. In addition, the secular rate of change of the horizontal stress, which is within 95 kPa/year, is larger outside the uplift dome than inside.

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