Vertical movements on the territory of Tallinn

Kall, Tarmo; Torim, Ants

doi:10.1016/s0264-3707(03)00011-5

Cited by 4 publications

(3 citation statements)

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“…A correlation has been found between the leveling results, the geological structure and groundwater level changes (Vallner and Lutsar, 1966). Previous studies based on the historical repeated leveling performed in Tallinn, show largest VLM rates over the ancient valleys buried under quaternary sediments (Kall and Torim, 2003). In the Tallinn area several deep valley-like incisions with depths over 100 m exist, filled with glacial, glaciofluvial, glaciolacustrine deposits, and Holocene marine deposits (Vaher et al, 2010).…”

Section: Introductionmentioning

confidence: 94%

“…The height benchmarks in Tallinn have been repeatedly measured during numerous leveling campaigns which were started more than 100 years ago (Kall and Torim, 2003). Several maps of vertical land movement (VLM) have been compiled on the basis of the results of repeated leveling (Zhelnin, 1958;Lutsar, 1965;Vallner and Lutsar, 1966;Kall and Torim, 2003). These VLM maps indicate the sinking of the Tallinn city center already in 1951.…”

Section: Introductionmentioning

confidence: 99%

“…From 1964 onwards, the sinking rate has been steadily decreasing (Lutsar, 1965). The data analysis by Kall and Torim (2003), based on the leveling done in 1986-2000, show that the sinking of the area that was being monitored, has stopped or reversed into rising. A correlation has been found between the leveling results, the geological structure and groundwater level changes (Vallner and Lutsar, 1966).…”

Section: Introductionmentioning

confidence: 99%

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Merging the gravity fields of the GRACE Follow-On Science Data System project using different weighting approaches

2023

Advances in Geodesy and Geoinformation

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The aim of this study was to evaluate millimeter-scale deformations in Tallinn, the capital of Estonia, by using repeated leveling data and the synthetic aperture radar (SAR) images of Sentinel-1 satellite mission. The persistent scattered interferometric SAR (PS-InSAR) analysis of images from ascending and descending orbits from June 2016 to November 2021 resulted the line-of-sight (LOS) displacement velocities in the Tallinn city center. Velocity solutions were estimated for the full period of time, but also for shorter periods to monitor deformation changes in yearly basis. The gridded LOS velocity models were used for the decomposition of east-west and vertical velocities. Additionally, the uncertainty of 2D velocity solutions was estimated by following the propagation of uncertainty. The 3D velocity of permanent GNSS station "MUS2" in Tallinn was used to unify the reference of all PS-InSAR velocity solutions. The results of the latest leveling in Tallinn city center in 2007/2008 and 2019 showed rather small subsidence rates which were in agreement with InSAR long-term solution. However, the short-term InSAR velocity solutions revealed larger subsidence of city center with a rate about -10 mm/yr in 2016-2017, and the uplift around 5 mm/yr in 2018-2019 with relatively stable periods in 2017-2018 and 2019-2021. The inclusion of groundwater level observation data and the geological mapping information into the analysis revealed possible spatiotemporal correlation between the InSAR results and the groundwater level variations over the deep valleys buried under quaternary sediments.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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