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- Glasbey, JC, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 2. |
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| 7. |
- Pan, M., et al.
(författare)
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An analysis of the Ethiopian Rift Valley GPS campaigns in 1994 and 1999
- 2002
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Ingår i: Journal of Geodynamics. - 0264-3707 .- 1879-1670. ; 33:3, s. 333-343
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Tidskriftsartikel (refereegranskat)abstract
- In cooperation with the Geophysical Observatory, Addis Ababa University, the Department of Geodesy and Photogrammetry of the Royal Institute of Technology carried out GPS measurements at three deformation networks in the Ethiopian Rift Valley in 1994 and 1999. For these campaigns the session-to-session repeatabilities were about 5 and 4 mm in the horizontal components and 50 and 10 mm in the vertical components using the IGS precise orbits, respectively. The results show, that the stations of the E3 network in the Rift Valley moved with a magnitude of 2.5 +/- 1.3 mm/a to the SE, and a magnitude of 21.3 +/- 1.4 mm/a to the ENE in the northeast (close to Assab of the Red Sea) relative to the station Addis Ababa on the African plate. The direction of movement is consistent with the local spreading vector of the Red Sea Rift with the N84degreesE slip direction estimated from seismic data. The sites of the E1 network moved by a rate of about 1-2 mm/a to the SE relative also to the station Addis Ababa. Further to the south there is an indication from our GPS data that the stations on the Somalian plate of the E2 network move by a rate of about 2.5 mm/a to the E or SE relative to the African plate. This motion can also be confirmed by geological and geodynamic data.
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| 8. |
- Pan, M, et al.
(författare)
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GPS measurements of crustal deformation in Skane, Sweden, between 1989 and 1996
- 1999
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Ingår i: GFF. - 1103-5897. ; 121, s. 67-72
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We estimate a network of crustal deformation in Skane using observations of the Global Positioning System (GPS) from 1989, 1990, 1992, and 1996. The network straddles the Tornquist Zone, potentially one of the most active fault zones in Sweden. It include
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| 9. |
- Sjöberg, Lars Erik, et al.
(författare)
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Glacial rebound near Vatnajokull, Iceland, studied by GPS campaigns in 1992 and 1996
- 2000
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Ingår i: Journal of Geodynamics. - 0264-3707 .- 1879-1670. ; 29:2-Jan, s. 63-70
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Tidskriftsartikel (refereegranskat)abstract
- Since about 1920 the Vatnajokull ice cap in Iceland has experienced a significant retreat, corresponding to a volume reduction of more than 180 km(3). With two GPS campaigns in 1992 and 1996 along the southern border of the glacier preliminary results reveal land uplift rates of 1-6 mm/yr, after a one-parameter (bias) fit with recent earth rheology models. The best fit model suggests that the lithosphere in the area is about 30 km thick and the viscosity of the asthenosphere 5 x 10(18) Pa s. The rms fit of uplift rate at all GPS sites is +/-1.4 mm/yr. As the GPS data alone cannot provide the absolute uplift rates, the one-parameter fit to the theoretical modelling implies that the absolute rates were estimated by the matching of the GPS data and model. The resulting uplift rate at station Hofn (1 mm/yr) is not consistent with two independent sources, and we therefore conclude that further GPS epoch and permanent GPS site data are needed to confirm the present geodynamic processes near Vatnajokull.
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