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| Titel |
Contribution of Geodetic Datum in GNSS Networks to Monitored Displacements |
| VerfasserIn |
Alpay Ozdemir, Ugur Dogan, Cüneyt Aydın |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127208
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| Publikation (Nr.) |
 EGU/EGU2016-7054.pdf |
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| Zusammenfassung |
| The aim of this study is to investigate the effects of datum definition on the monitored
displacements of GNSS networks. The datum definition is a significant problem in terms of
reliable deformation analysis and interpretation on determining the deformation in GNSS
networks. The observations have been analyzed to show the reliability analysis of a group of
station in the network and the influence of datum definition on the deformations of GNSS
monitoring networks.
For this purpose, we studied GPS observations in the CORS-TR network collected on a
set of 13 station to detect co-seismic deformation of the 23 October 2011 (Mw=7.2) Van
earthquake in the eastern of Turkey. The GPS observations were processed in the
ITRF 2008 reference frame using the Bernese 5.2 GNSS software. Seven datum
configuration modes which depend on the number of datum stations, which are selected
from 9 IGS stations, were defined to determine co-seismic deformation of the Van
earthquake and the deformations of GPS stations were computed for every datum
definition.
Our results indicate that each station showed different temporal behavior and significant
relative motions with respect to datum definition. On the other hand, the distribution of the
datum stations around the monitored region seems to be very important factor for determining
the displacements. To show the effect of datum station distribution, we compare the
displacements obtained from two different datum configuration modes (mode 1: 4 datum
station “BUCU, GRAZ, MATE, SOFI” located at Eurasian plate, which are far away from the
region, and mode 2: 9 datum station “BUCU, GRAZ, MATE, SOFI, TUBI, CRAO, ZECK,
NICO, DRAG” located around the region). For instance, co-seismic displacements
for station MURA, which is the closest station to the earthquake epicenter (∼43
km), amounted to -82.24 ± 0.60 mm for the north component, 12.01 ± 0.76 mm
for the east component and -25.19 ± 2.49 mm for the up component with respect
to mode 1, -89.34 ± 0.59 mm for the north component, 8.63 ± 0.55 mm for the
east component and -9.23 ± 2.39 mm for the up component with respect to mode
2.
Keywords: Displacement, Datum Effect, GNSS |
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