Deformation analysis based on GNSS measurements in Tashkent region

Dilbarkhon Sh Fazilova,Lola V Sichugova,L Foldvary,I Abdurahmanov

doi:10.1051/e3sconf/202122704002

Dilbarkhon Sh Fazilova, Lola V Sichugova + Show 2 more

Open Access

https://doi.org/10.1051/e3sconf/202122704002

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Abstract

This paper presents the results of the GNSS geodetic network deformation analysis in the Tashkent region, as an example of an urban area, where obtaining reliable information for assessing hazard risk is of great importance. A software package in Delphi language has been developed for the assessment of the datum differences between 2009 and 2011 by implementing the 3D Helmert transformation method. The result revealed that there is significant translation and rotation in the network, while the scale of the network remains almost constant during two years period. The area strain was estimated by the finite element method. Most of the Tashkent region can be considered to be in a high compression (negative dilatation) strain state with maximum value -230cl0-8. On the contrary, remarkable positive dilatation strain is concentrated on the coastline of the Charvak water reservoir, where large strain is about 351.l0-8.

Highlights

Tashkent region is located in the Middle Tien-Shan zone at the boundary two large components
The result revealed that there is significant translation and rotation in the network, while the scale of the network remains almost constant during two years period
Remarkable positive dilatation strain is concentrated on the coastline of the water reservoir, where large strain is about 351×l0-8

Summary

Introduction

Tashkent region is located in the Middle Tien-Shan zone at the boundary two large components. It is a part of the post-platform mobile region and is located in the transition zone between the Tien-Shan orogenic territory and the Turan plate. According the results are presented in map of Peak Ground Acceleration, the region belongs one of the two fields in the country of very high seismic activity (up to 4.8 m/s2) [3]. Significant velocity rates between 30 mm/year and 60 mm/year were found to the tectonic fault zones and mountainous part of the area, the flat, foothills zones show velocity rate up to 15 mm / year [5].

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