Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.gao.spb.ru/english/as/j2014/presentations/gorshkov.pdf Дата изменения: Tue Oct 7 17:02:14 2014 Дата индексирования: Sun Apr 10 05:53:08 2016 Кодировка: Поисковые слова: arp 220

Deformation of the South-Eastern Baltic Shield f r o m GN S S o b s e r v a t i o n s
V.L. Gorshkov1 , N.V. Scherbakova1 , A.V. Mohnatkin2 , S.S. Smirnov1 2 , S.D. Petrov2 , D.A. Trofimov2 , T.V. Guseva3 , V.P. Perederin3 , N. Rosenberg3
1

Pulkovo Observatory, 2 St.Petersburg State University, 3 Earth Physics Institute

September 24, 2014


Ge o l o g i c s e t t i n g o f t h e S o u t h - E a s t e r n B a l t i c S h i e l d



City of St.Petersburg marks a border between Baltic Shield and East-European Platform; The landscape in the area changes from Archean (3.5 billion years) to Carboniferous (350 million yeears) along the line of 300 km from North to South; Previous GNSS-measurements revealed deformations in the area, confirmed by geologic and seismic studies; Recent GNSS-measurements (Gorshkov et al. 2012) revealed a possible slow rotation of the South-Eastern Baltic Shield with respect to the East-European Platform.








Ge o l o g i c m a p o f t h e S o u t h - E a s t e r n B a l t i c s h i e l d


Previous results: Gorshkov et al. 2012


Aim of study



Gather available GNSS-measurements in the area for the last few years; Process the GNSS-measurements within one common model; Examine the station coordinate time series; Estimate the latitudinal and meridional velocities from station coordinate time series; Estimate the deformation field from the station velocities.






GN S S s t a t i o n s


GN S S s t a t i o n s : c l o s e u p


GNSS processing


Input data: 38 stations for 1992-2014; Software: Gipsy/Oasis 6.3; Type of solution: PPP (Precise Point Positioning); Absolute antennae calibration, orbit and clock corrections IGb08, IERS EOPs, VMF1GRID troposphere, GOT4.8 ocean load tides, IERS solid Earth tides, GOT4.8ac geocenter model, IMLS atmospheric loading; Station coordinate time series edited for antennae changes and outliers; Station velocities estimated by linear fits; Deformation field estimated by use of the algorithm of Teza et al. (2008).






S t a t io n v e lo c it e s


Deformation field


Conclusions



The border area between the Baltic Shield and the East-European Platform is subject to a weak meridional compression; The slow counterclockwise rotation of the South-Estern Baltic Shield with respect to the East European platform is likely to be confirmed; Some stations show different (even opposite) velocities and need to be more carefully examined.