Gravitační signál modelů zemské kůry

Jaroš, Jaroslav

Global models of the Earth's crust, such as CRUST1.0, describe the 3-D distribution of seismic speeds and of material density in the crust. They are widely used in the geophysical community as reference models in local and regional seismic studies and are also the basis of current prediction models of geoneutrino flux from Earth's lithosphere. In this study we attempt to validate the seismology-based CRUST1.0 model using GOCE-derived gravity data. We calculate the anomalous gravitational potential and its first and second radial derivatives, induced at altitude of 250 km by the density distribution in the uppermost ~80 km thick shell of the Earth as described by CRUST1.0. We then compare the prediction with the GOCE model datasets inferred from the GOCE mission satallite gravity measurements. We find that the predicted signal is a factor of ~4 stronger than the measurement in terms of its root-mean-square value. The signal overestimation is consistent across the spherical harmonic spectrum and the spectral correlation of prediction vs. measurement is weak. Our findings motivate the need for improvement of CRUST1.0 and similar models by incorporating gravity data in the model inversion.

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