G23B-0484:
Considering crustal structure in predictions of earth response to terrestrial water storage simulations
Tuesday, 16 December 2014
Robert Dill1, Volker Klemann1, Florian Buchholz1, Magdala Tesauro1,2, Jan M. Hagedoorn1, Henryk Dobslaw1, Mikhail K Kaban1, Zdenek Martinec3,4 and Maik Thomas1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Utrecht University, Department of Geosciences, Utrecht, Netherlands, (3)Dublin Institute for Advanced Studies, School of Cosmic Physics, Dublin, Ireland, (4)Charles University, Department of Geophysics, Prague, Czech Republic
Abstract:
Non-tidal loading processes due to variations in atmospheric surface pres- sure, ocean bottom pressure and terrestrial water storage cause vertical crustal displacements of several millimeters on subdaily to seasonal time scales. These deformations are well reflected in positioning time series from GPS sites and, thus, affect epoch-wise parameters obtained from the analysis of global geodetic networks. Whearas atmospheric surface pressure and ocean bottom pressure usually induce a larger scale signal, the hydrological loading contains strong localized signals with exceptionally high amplitudes exceeding several millimeters that can be associated with major precipitation events and river floods. The deformational response to these quite heterogeneous loading patterns, therefore, is expected to depend strongly on the local earth structure. In this study we present a framework for localized Green’s functions parameterising the earth’s crustal response and apply it to a high-resolution hydrological loading model.
