On horizontal crustal strain in Finland

Kakkuri, Juhani; Chen, Ruihzi

doi:10.1007/bf00806806

Cited by 33 publications

(19 citation statements)

References 2 publications

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“…We find no indication of deformation exceeding 3 mm/yr across the entire shield area. Our findings do not support the results of Kakkuri and Chen (1992), who used repeated optical triangulation and estimated deformations at levels of 1 cm/yr over 100 km. Their results appear too close to the standard deviation of 0.1 micro-strain per year to be considered as robust.…”

Section: Resultscontrasting

confidence: 99%

“…The network would then observe primarily the elastically released strain of the crust, which is more evenly distributed. However, there is an open debate after propositions of large ratios between aseismically and coseismically released strain in the fault zones and even outside (Slunga, 1991) referring to results from triangulation and trilateration in Finland Kakkuri and Chen, 1992). Campaign-based GPS studies in Sweden claim motions of 1-3 mm/yr both at or below a 200 km scale (in the Scania province around the Törnquist zone, and across fault zones at the shield scale .…”

Section: Introductionmentioning

confidence: 99%

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BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

et al. 2014

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Since autumn 1993 the BIFROST project has provided daily GPS solutions of geodetic positions from a network of more than 40 stations covering a large area of the Baltic shield. This area is expected to show large vertical motion due to glacial isostatic rebound following the deglaciation at the end of the Pleistocene. This paper will discuss the inference of three-dimensional rates of crustal motion at the GPS stations with respect to (1) a plate-fixed average for the horizontal components; (2) a geocentric reference in order to infer absolute changes of sea level from vertical crustal motion and models of geoidal rebound. We show that the horizontal strain rate pattern is largely dominated by unilateral extension and not exhibiting horizontal shear to an important extent. In regard to the vertical motion a crucial issue is the stability of the geocentre in the GPS frame. We show results from an Empirical Orthogonal Function analysis that attenuates regionally correlated noise. In all components our observations suggest reasonably close agreement with forward computions on the basis of postglacial isostatic adjustment. A dominant tectonic signal would lead to a certain fraction of the batch of baselines to exhibit shortening. A tectonic process leading to a similar pattern of horizontal motion as expected from postglacial rebound can safely be dismissed in the context of the currently accepted plate tectonic setting. Thus, our baseline rate comparison will be a critical first order test of the prevailing style of deformation.

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

et al. 2014

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“…Anholt is situated between the current 0 and 1 mm yr )1 isolines for vertical movement, whereas the station of sea-level measurements is located close to the 0 mm yr )1 isoline (Kakkuri and Chen, 1992). We assume that the total rebound of the modern coastal features we have studied does not exceed 0.03 m. Weak earthquakes are recorded in the Kattegat area (Gregersen et al, 1996).…”

Section: Resultsmentioning

confidence: 99%

Sea‐level markers identified in ground‐penetrating radar data collected across a modern beach ridge system in a microtidal regime

Nielsen

Clemmensen

2009

Terra Nova

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Sea‐level rise has been related to global warming. The modern system on the northern coast of Anholt, Denmark, may well be analogous to other beach ridge systems formed in microtidal regimes and our results should have impact on estimation of past sea‐level variation. Ground‐penetrating radar data collected across the modern (<30 years old) berm, beach ridge and swale deposits resolve downlapping reflections interpreted to mark sea level at the time of deposition. Existing time series of sea‐level data constrain actual sea‐level variation. Nineteen readings of sea‐level markers made along our profile fluctuate within −0.42 and 0.57 m above present mean sea level, consistent with 95% of the sea‐level data. These fluctuations reflect tidal effects and meteorological conditions. Main data uncertainties are well‐known and the sea‐level markers may be identified with a high degree of confidence.

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“…With this approach, variance for the relative location can be obtained by (Kakkuri and Chen 1992) du ¼ ðE þ wÞr þ t 0 (10) Figure 4. Location of the 30 object points having maximum displacement vectors.…”

Section: Strain Analysis Of Dammentioning

confidence: 99%

Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey

Yavaşoğlu

Kalkan

Tiryakioğlu

et al. 2017

Geomatics, Natural Hazards and Risk

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Every man-made structure creates certain risks -dams are no exception. Most failures in man-made structures that have occurred could have been avoided if the structures' behaviour had been inspected, monitored, and analyzed continuously, and if proper corrective measures had been taken in a timely fashion. The DSI (The General Directorate of State Hydraulic Works), which is the institution responsible for dam safety, has long used surveying methods to measure the displacements of geodetic points as a part of dam monitoring policy. In this study, we focus on the dam's mechanical behaviour throughout a time period of more than 10 years. These study results have been derived from a separate, ongoing project that has monitored deformation on the Ataturk Dam and is now determining the water level of the reservoir. The project results show that although the dam body has become more stable and the water load behind the dam has increased, the rate of displacement of the dam has declined significantly. From these results, it can be seen that the reservoir water level can be increased evenly over time and that 542 m is the maximum water level of the dam's reservoir.

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On horizontal crustal strain in Finland

Cited by 33 publications

References 2 publications

BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

Sea‐level markers identified in ground‐penetrating radar data collected across a modern beach ridge system in a microtidal regime

Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey

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