Annual deformation signals from homogeneously reprocessed VLBI and GPS height time series |
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| Authors: | Volker Tesmer Peter Steigenberger Markus Rothacher Johannes Boehm Barbara Meisel |
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| Institution: | 1.Deutsches Geod?tisches Forschungsinstitut (DGFI),Munich,Germany;2.OHB-System AG,Bremen,Germany;3.Institut für Astronomische und Physikalische Geod?sie,Technische Universit?t München,Munich,Germany;4.Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum (GFZ),Potsdam,Germany;5.Institute of Geodesy and Photogrammetry, ETH Zurich,Zurich,Switzerland;6.Institute of Geodesy and Geophysics (IGG), TU Vienna,Vienna,Austria |
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| Abstract: | The first part of this paper compares homogeneously reprocessed Very Long Baseline Interferometry (VLBI) and Global Positioning
System (GPS) long-term height series from 1994 to 2007. The data analysis used fully adapted state-of-the-art models (like
VMF1 and a priori zenith delays from ECMWF) for the GPS and VLBI processing. The series are compared in terms of long-term
non-linear behaviour, harmonic and mean annual signals (not necessarily of harmonic nature). The similarity between both techniques
is very good (especially the mean annual signals), which is assumed to be due to the adapted models and consistent reprocessing
of both series. As two almost independent observing techniques see the same annually recurring signals at almost all co-located
sites, we expect a good geophysical interpretability as integral vertical deformation. For the second part of this paper,
the height time series of 161 suitable GPS sites (of the same solution as before) are used to determine a harmonic and a mean
annual signal for each of them. Comparing the annual signals for this big dataset visually to GRACE-determined load deformations
described in other publications, we find good agreement. This puts emphasis to the assumption that our height data have a
lot of potential to be interpreted as geophysical signals. Out of these 161, 131 are grouped to 55 clusters, if at least two
nearby (some thousand kilometres) sites show similar mean annual signals, which are thus confirmed to be real regional deformation,
not local or technical artefacts. These 55 signals are presented on a “world map” of regional average mean annual height signals,
as easy-to-handle tool to validate geophysical models. The data of these measured regional mean annual signals can be downloaded
from a web-page for numerical analysis. |
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