Earth’s response to surface mass loads: inferences from ocean tide loading
July 6, 2017 • 135 Views
Workshop 2017 - Peter Clarke - GPS observations in western Europe (Bos et al., J. Geophys. Res., 2015) require that asthenospheric anelasticity be taken into account in modelling Earth’s response to semi-diurnal ocean tide loading (OTL) . This is not the case in Earth models commonly used for OTL, which are expressed at seismic timescales where the anelastic effects on geodetic observables are negligible. At seasonal timescales, severe dispersion and dissipation can be expected, which correspond to the onset of transient or steady-state viscous behaviour. This anelasticity will modify both the spatial pattern and timing of Earth’s response to surface mass loads. We investigate the implications of this for the forward and inverse modelling of surface mass loading deformation and geodetic time series analysis.