Abstract
Ny-Alesund, Swalbard region which is located in the mid-ocean ridge of the Arctic Ocean, and named Gakkel ridge, is the slowest spreading ridge of the global system. In the present study an attempt has been made to associate isostatic rebound using GPS campaign data collected at Ny-Alesund area. The Artic Region Campaign GPS network was established in 2009. The network consists of three campaign mode station. The distance between GPS point is about ~30 km. The preliminary results of our investigation appear broadly consistent with the recent tectonic activity in western Svalbard. The resultant velocity vector is 14.84 mm·yr–1 with an azimuth of 27.67°N and a vertical displacement of 7.62 ± 3.0 mm·yr–1 is estimated in Swalbard, in which we presume Glacial Isostatic Rebound (5.1 mm·yr–1) and post glacial geological process (Present Day Ice Melting, erosion, and shore line deposits) of 2.52 mm per year in the study area.
Highlights
Much of Northern Europe, Asia, North America, Greenland and Antarctica were covered by ice sheets during the last glacial period
We considered the possi- bilities of other discrepancies due to various geological processes such as raised shore line deposits and high ero- sion rates (Figure 9) at Ny Alesund [26,27,28,29]
The results presented in this research are preliminary at best and do need a fourth epoch so that the results can correctly reflect the conditions present at arctic region
Summary
Much of Northern Europe, Asia, North America, Greenland and Antarctica were covered by ice sheets during the last glacial period. At the end of each glacial period when the glaciers retreated, the removal of the weight from the depressed land led to slow (and still ongoing) uplift or rebound of the land and the return flow of the mantle material back under the deglaciated area. The initial was near-instantaneous due to the elastic response as the ice load was removed. After this elastic phase, uplift was slow due to viscous flow and the rate of uplift decreased exponentially. Studies suggest that rebound will continue for at least another 10,000 years. The total uplift from the end of deglaciation depends on the local ice load and could be several hundred metres near the centre of rebound
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